64 results about "Rare earth ions" patented technology

The application discloses a kind of based on ensemble rare earth ions double quantum bit controlled gate construction method, it is related to quantum control technical field, it includes to double quantum bit frequency site selection, and respectively as control bit, target bit;Utilize the blocking effect generated by the dipole-dipole interaction between double quantum bits to construct controlled gate, including: to control bit apply light pulse driving control bit is from ground state transition to excited state;To target bit apply single quantum gate to drive its evolution, and apply compensation pulse;To control bit apply light pulse driving control bit from excited state de-excitation to ground state.The application utilizes the interaction of the light pulse and quantum system medium that can be optimized to produce arbitrary geometric quantum logic gate on target quantum bit, and simultaneously by using the blocking effect caused by dipole-dipole interaction, the evolution of target bit quantum bit can be constrained by control bit.

This invention discloses a rare-earth ion co-doped two-dimensional semiconductor material with optimized ratio, its preparation method, and its application, belonging to the field of two-dimensional materials technology. The material is a transition metal chalcogenide WS2 doped with Er. 3+ and Yb 3+ By adjusting the mass ratio of ErCl3 to YbCl3 in the precursor, the Er:Yb doping molar ratio was optimized to 1:4 while maintaining a constant total doping concentration. This invention employs salt-assisted chemical vapor deposition to grow centimeter-scale, uniformly thick WS2 (Er-Yb) monolayer films on sapphire substrates, achieving an overall rare earth doping concentration as high as 10.7 at%. Experiments confirm that when the Er:Yb doping ratio is optimized to 1:4, the Yb... 3+ As a sensitizer, it can effectively absorb photon energy and efficiently transfer it to Er. 3+ The activator significantly enhances energy transfer efficiency and inhibits concentration quenching, enabling the material to exhibit the best photoelectric properties under 635nm illumination.

The application relates to the technical field of transparent glass ceramic preparation, in particular to a Ca 1.46 Ti 1.38 Nb 1.11 O7 crystal phase transparent glass ceramic and a preparation method and a transparent luminescent material 1.46 Ti 1.38 Nb 1.11 O7 crystal phase transparent glass ceramic is prepared by taking calcium salt, Na salt, B source and Nb, Ti and Sb oxides as raw materials, heating the raw materials to be molten into a liquid state, performing annealing treatment after solidification forming to obtain transparent glass; the transparent glass is subjected to crystallization at 600-640 DEG C and is kept for 1-2 hours to generate Ca 1.46 Ti 1.38 Nb 1.11 O7 crystal phase, and Ca 1.46 Ti 1.38 Nb 1.11 O7 crystal phase transparent glass ceramic is obtained. By adjusting the raw material composition and the crystallization temperature, a specific crystal phase and a crystal field environment can be formed, which can provide a doping site for rare earth ions and is beneficial to improving the luminescent intensity after doping.

The application discloses a temperature measuring method and device for the internal flow channel of a heat exchanger. The method comprises the following steps: taking dysprosium and erbium co-doped quartz optical fiber as a temperature sensing element; exciting rare earth ions in the optical fiber to generate characteristic fluorescence; collecting dysprosium and erbium fluorescence signals; obtaining the fluorescence lifetime of dysprosium and comparing it with a characteristic threshold to obtain a temperature classification; based on the temperature classification, different segmented weighted fusion algorithms are respectively used to calculate the sensor temperature; when the temperature classification is consistent with the calculation result of the weighted fusion algorithm, the calculation result is output; when the temperature classification is not consistent with the calculation result of the weighted fusion algorithm, the calculation result is used to correct the temperature classification, and the segmented weighted fusion algorithm is called by using the corrected temperature classification to obtain a measured result. The application can improve the accuracy of temperature measurement.

This invention discloses a Yb-BiOI / Ce-MgAl-LDH composite photocatalyst, its preparation method, and its application, belonging to the field of environmental functional materials and photocatalysis technology. The purpose of this invention is to provide a Yb-BiOI / Ce-MgAl-LDH composite photocatalyst with high catalytic activity, good stability, and reusability, its preparation method, and its application in the efficient degradation of tetracycline antibiotics. This invention prepares a Yb-BiOI / Ce-MgAl-LDH heterojunction composite catalyst with a three-dimensional flower-like interwoven morphology via a hydrothermal method. Under visible light and H2O2 coexistence conditions, this catalyst not only promotes photogenerated carriers (e-carriers) through the built-in electric field at the heterojunction interface, but also… ‑ / h + Effective separation of Ce, while utilizing Ce 3+ / Ce 4+ Redox pairs with Yb 3+ Doping-induced active sites synergistically catalyze the decomposition of H2O2, continuously generating high concentrations of hydroxyl radicals (·OH); photogenerated electrons can accelerate the valence state cycle of rare earth ions, while Fenton-like reactions promote charge separation. The deep coupling of the two produces a significant synergistic enhancement effect, achieving rapid and deep degradation of antibiotics.

This invention discloses a cobalt-free lithium-rich manganese-based cathode material, its preparation method, and its application. The cobalt-free lithium-rich manganese-based cathode material is doped with rare earth elements, and the ratio of the amount of rare earth elements to the total amount of nickel, manganese, and rare earth elements is 0.1-5%. By introducing rare earth elements, the cobalt-free lithium-rich manganese-based cathode material significantly improves its structure and electrochemical stability. Specifically, rare earth ions have large radii and high charges, preferentially entering the lithium layer to form a "pinning effect," effectively suppressing transition metal migration and the layered-to-spinel phase transition during cycling, thereby alleviating voltage decay. Their strong M–O bonding ability enhances lattice oxygen stability, reduces O2 release under high voltage, and improves the first-cycle coulombic efficiency.

The invention discloses a preparation method of a loose body based on an optical fiber preform, and relates to the technical field of optical fiber processing. The method comprises the following steps: SS01, depositing a barrier layer by adopting an MCVD (modified chemical vapor deposition) process; sS02, multi-time deposition of a loose core layer is conducted through the MCVD deposition technology; sS03, preparing a doping solution containing rare earth ions and aluminum ions; sS04, off-line solution doping is carried out, and a vacuum pressurization alternate driving mode is adopted in the doping process. The porosity of the loose core layer is gradually reduced from inside to outside, a permeation resistance gradient is formed, the high porosity of the inner layer provides sufficient permeation channels, the low porosity of the outer layer plays a role of a barrier layer, rare earth ions are prevented from being adsorbed by the surface layer too early and exhausted in the doping process, and the rare earth ions are prevented from being adsorbed by the surface layer too early and exhausted through the forced permeation effect of vacuum pressurization alternate driving. Dissolved gas is discharged through vacuumizing operation after each stage of pressurization, space is vacated for next-stage permeation, and the rare earth ions are evenly distributed in the radial direction of the loose body.

The application discloses a two-component polyurethane with high strength, high toughness, aging resistance and fluorescent performance, which comprises an A component and a B component. The A component is prepared from an oligomer polyol, an aliphatic isocyanate, a hydrazide chain extender, a polyol small molecule crosslinking agent and a metal ion crosslinking agent. The B component is a fluorine-containing segment modified isocyanate. The application introduces a hydrazide group and a metal ion into the A component, so that the A component is rich in hydrogen bonds and metal coordination bonds, and the strength and toughness of the two-component polyurethane are enhanced. Even the two-component polyurethane can be endowed with fluorescent performance by introducing rare earth ions, and the application of the two-component polyurethane is expanded. After the A component and the B component are cured, the organic fluorine segment in the B component and the aging-resistant material in the A component synergistically enhance the aging resistance of the two-component polyurethane.

The invention discloses a medium-entropy high-temperature dielectric ceramic and a preparation method thereof, and belongs to the technical field of functional ceramics, the chemical general formula of the ceramic material is (RE1, RE2, RE3) 3Al5O12, RE1, RE2 and RE3 are three different trivalent rare earth ions, and the key characteristic is that the ion radiuses of the three rare earth ions respectively belong to a large range, a medium range and a small range. According to the design, controllable maximum lattice distortion is introduced, the ion and electron polarizability of the material is remarkably enhanced on the premise that a garnet single-phase structure is not damaged, so that the intrinsic dielectric constant of the material is improved, and the medium entropy design ensures excellent high-temperature phase stability and dielectric property temperature stability of the material. The prepared medium-entropy high-temperature dielectric wave-absorbing ceramic can work in a high-temperature environment of 0-800 DEG C, not only has the characteristics of low heat conductivity and high temperature resistance, but also has excellent wave-absorbing performance in an X wave band, the lowest reflection loss of the medium-entropy high-temperature dielectric wave-absorbing ceramic can reach-58 GHz, and the effective absorption bandwidth of the medium-entropy high-temperature dielectric wave-absorbing ceramic can reach 2.8 GHz.

This invention discloses an integrated dual-mode-locked fiber laser source for dual-comb measurements, comprising: a pump source, a wavelength division multiplexer (WDM), a rare-earth ion-doped fiber, a first optical circulator, and a second optical circulator. The pump source is coupled to the rare-earth ion-doped fiber via the WDM. The first and second optical circulators are respectively connected to the two ends of the rare-earth ion-doped fiber. The first optical circulator forms a first resonant cavity with a first group of mode-locking elements, and the second optical circulator forms a second resonant cavity with a second group of mode-locking elements. The first and second resonant cavities are optically isolated from each other by the directional transmission characteristics of the first and second optical circulators, and share the pump source and the rare-earth ion-doped fiber to synchronously output two mode-locked pulses. This invention can generate two highly coherent mode-locked pulses with independently adjustable parameters using a single pump source and a single gain medium, exhibiting high integration, good stability, and strong practicality.

The present application relates to the technical field of inorganic non-metallic refractory material preparation, in particular to a homogeneous sintering process of high-calcium and low-iron dolomite sand for refractory; comprising the steps of preparing anhydrous homogeneous modified sol, light-burning dolomite grafting treatment, pre-sintering activation and isostatic pressing forming homogeneous sintering; the technical principle is to use organic multi-tooth chelating groups to ensure homogeneous distribution of tetravalent zirconium ion / tetravalent titanium ion precursor, to generate high-melting-point continuous network phase to wrap calcium oxide at high temperature in situ, and to combine with rare earth ion solid solution to produce lattice defects to reduce sintering activation energy; the present application overcomes the defects of physical addition of burn-promoting agents to reduce high-temperature performance and easy loss of surface coating, uses in-situ wrapping of grain boundaries and defect burn-promoting mechanism to solve the problems of difficult densification and easy hydration of the material, realizes high densification, and effectively improves the anti-hydration, anti-thermal shock and anti-slag erosion capacity.

This invention relates to a rare earth metal-doped sodium iron sulfate cathode material, its preparation method, and a battery thereof. The cathode material is expressed as Na. 2‑2x Fe 2‑2x R 2x (SO4)3, where 0.02 ≤ x ≤ 0.1, and R is selected from rare earth metal elements. The preparation uses iron, rare earth metal, and sodium sources as raw materials, and ascorbic acid as a reducing agent. The product is obtained through dissolution and drying. This invention utilizes rare earth ions to substitute Fe. 2+ The invention establishes a stable crystal structure, significantly suppresses Fe ion dissolution at high temperatures, and mitigates structural distortion during charge and discharge. The resulting material exhibits significantly improved capacity retention after 300 cycles at 45°C and 1C rate, demonstrating excellent high-temperature cycling stability. This invention utilizes a mild process, readily available raw materials, and high reproducibility, solving the problems of poor high-temperature cycling and rapid capacity decay in traditional sodium iron sulfate cathodes. It is suitable for high-performance sodium-ion batteries and possesses promising industrialization prospects.

The application relates to a method for predicting and regulating the up-conversion nanomaterial mixed system light-emitting life, and the specific method is as follows: first, synthesizing NaYF4-based up-conversion nanoparticles with different rare earth ion doping ratios, the two kinds of nanoparticles have different light-emitting lives; then, mixing the two kinds of up-conversion nanoparticles to obtain a life attenuation curve and a convolution fitting curve; combining the light-emitting intensity proportion of the two kinds of nanoparticles in the mixed system, the light-emitting life of the mixed system can be predicted, and the mixed system can also be designed according to a target light-emitting life. The method can continuously adjust the life, does not need a large amount of synthesis, and improves the optical code capacity in subsequent anti-counterfeiting, information encryption and the like.

The application discloses a kind of porous high-entropy rare earth monosilicate ceramic powder and preparation method and application thereof, it is related to high-entropy ceramic technical field, comprising the following steps: S1, tetraethyl orthosilicate is dissolved in anhydrous ethanol, fully stirred, as silicon source solution;S2, silicon source solution is added to rare earth nitrate solution, fully stirred, to obtain mixed solution;S3, sodium hydroxide solution is added to mixed solution as rare earth ion coprecipitation agent and tetraethyl orthosilicate condensation catalyst, it is sealed in reactor and reacted for 24-60h, precursor gel is obtained after separation and drying;S4, precursor gel is calcined at 1350-1400 ℃ for 2-4h and then quenched to room temperature, to obtain porous high-entropy rare earth monosilicate ceramic powder.The porous high-entropy rare earth monosilicate ceramic powder provided by the application has the characteristics of uniform element distribution, large component space, no impurity phase, low thermal conductivity, etc., as well as the advantages of simple equipment and controllable process, and is suitable for use in aero-engine hot end components, with wide application prospect.

The application relates to a doped optical fiber preparation process and discloses a high-uniformity and high-concentration Pr 3+ The application discloses a preparation method of a doped quartz-based glass optical fiber. Rare earth oxide Pr2O3, silica powder SiO2 and aluminum oxide Al2O3 are weighed, mechanically mixed, ball milled, dried, sieved, pre-sintered to be transformed into cristobalite, drawn into a glass rod containing a core by using a tube melting method, and processed to remove the outer cladding of the glass rod to obtain a core rod with adjustable diameter. The tube rod method is combined with a high-purity quartz tube to form an optical fiber preform rod. Finally, the optical fiber preform rod has high uniformity, low loss and high concentration of Pr 3+ The application discloses a drawing method of a doped quartz optical fiber. The aluminum oxide Al2O3 is introduced to improve the solubility of the rare earth ion Pr 3+ in the quartz glass and reduce the melting point of the quartz raw material. The rare earth doping concentration is adjustable. The raw material is transformed into cristobalite by pre-sintering, and the effect of reducing the bubbles of the core glass and improving the uniformity of the core glass is remarkable by combining the vacuum tube melting method.

This invention discloses a core-shell structure YTaO4:Er 3+ / Yb 3+ @YTaO4 thermal barrier coated fluorescent temperature probe material and its preparation method. Er is prepared using the Pechini sol-gel method. 3+ Single doping and Er 3+ / Yb 3+ YTaO4 luminescent cores were co-doped, and an inert shell of YTaO4 was constructed using a "coating + low-temperature calcination" process to form a core-shell structure, achieving stable upconversion luminescence performance at high temperatures. The prepared YTaO4:Er 3+ / Yb 3+ @YTaO4 core-shell structured materials combine the high luminescence intensity of the luminescent core with the protective effect of the shell on luminescence stability under high-temperature environments. They exhibit excellent temperature sensing sensitivity at high temperatures, making them suitable for online temperature monitoring and health assessment of intelligent thermal barrier coatings. This core-shell structure design effectively improves the luminescence stability of rare-earth ions, providing a novel solution for high-temperature fluorescent temperature sensing materials.

The application belongs to the technical field of adsorbing materials, and particularly relates to a high-selectivity strontium adsorbing material, a preparation method and application. The preparation method of the high-selectivity strontium adsorbing material comprises the following steps: loading rare earth ions on collagen fibers to obtain an intermediate material; and reacting an oxalate salt and a dimethylamine cation mixed solution with the intermediate material to generate a MOF crystal material with cavities in situ. The application takes dimethylamine cations as exchange ions, and the crystal structure formed by the coordination of rare earth ions and oxalate ions has a cavity size matching the hydrated ion radius of strontium, and has high selectivity to strontium ions, so that the strontium ions can be removed with high selectivity in the presence of various ions.

The application provides a rare earth-based coating for extracorporeal circulation system pipeline and a preparation method thereof, and the preparation method comprises the following steps: step 1, immersing the pipeline in a pretreatment liquid, and after immersion, washing and drying are performed to obtain a pipeline with a dopamine transition layer; step 2, immersing the pipeline with the dopamine transition layer in a rare earth immersion liquid, and after immersion, washing and drying are performed to obtain the rare earth-based coating for extracorporeal circulation system pipeline. The rare earth-based coating for extracorporeal circulation system pipeline disclosed by the application forms a dense and stable rare earth ternary coating on the PVC pipeline through the alternating action of rare earth ions, hyaluronic acid and dopamine cations and anions, and since the force of the three is electrostatic force, the coating has the effects of firmness, stability and non-falling.

This invention discloses a laser frequency conversion system and method based on thermal lensing effect enhancement, belonging to the field of laser technology. The system includes a first pump source, a nonlinear frequency conversion crystal, and a second pump source. The crystal is a rare-earth-doped calcium borate crystal, which absorbs the first pump light to generate a controllable thermal lensing effect. The fundamental wave light emitted from the second pump source is coaxially incident on the crystal with the first pump light. The thermal lens focuses the fundamental wave light, significantly increasing its power density within the crystal. The crystal then utilizes a nonlinear optical effect to efficiently convert the high-power-density fundamental wave light into harmonic light output. This invention solves the problem of low efficiency in traditional extracavity frequency doubling. Through an active focusing mechanism, high-efficiency and high-stability visible light laser output can be achieved with only a lower fundamental wave power, making it particularly suitable for biological detection and medical aesthetics.

This invention discloses a piezoelectric ceramic for use in clock crystals, its preparation method, and a resonator. The chemical formula of the piezoelectric ceramic is: [formula omitted for brevity]. Wherein, A is composed of Pb, Sr, and Ba; B is a perovskite structure composed of Ti, Zr, and Hf; D is a dopant element composed of M1, M2, and M3, where M1 is a high-valence rare-earth ion, M2 is an acceptor ion, and M3 is a variable-valence ion. This invention achieves synergistic optimization of core-shell structure and performance for specific vibration modes required for clock applications by using specific A / B site element composition and the chemical formula and proportion range of the "M1 (rare earth) + M2 (acceptor) + M3 (variable-valence)" ternary composite doping system.

This invention relates to the field of electrical insulation materials and special polymer coatings, specifically to a rare earth-modified wear-resistant enameled wire insulation coating and its preparation method; it comprises an insulating resin base, a rare earth-organic hybrid modifier, and an organic solvent; the coating uses a complex sol formed by the coordination of polysiloxane containing multidentate chelate ligands and reactive end groups with rare earth ions as the modifier; its core is to utilize the multidentate chelate ligands to covalently connect the polysiloxane skeleton and to firmly bind rare earth ions through coordination bonds, thereby constructing a stable and uniform molecular-level dispersed network structure; this invention abandons the traditional inorganic particle physical blending method, effectively suppressing the kinetic mismatch and gravity sedimentation defects caused by high-density rare earth phases, so that the liquid coating maintains excellent compatibility and uniformity during long-term storage.

This invention provides an optical waveguide amplifier and a method for fabricating it. The optical waveguide amplifier includes a substrate layer, an insulating layer, a passive waveguide layer, and multiple doped layers. The insulating layers are stacked on the substrate layer. The passive waveguide layer and the multiple doped layers are stacked on the insulating layer. An m-layer doped layer is disposed above the passive waveguide layer, and an n-layer doped layer is disposed below it, where m and n are integers, m+n≥2, and m≥0, n≥0. The multiple doped layers are doped with various rare-earth ions. Compared to fiber amplifiers doped with rare-earth elements, the optical waveguide amplifier in this embodiment is smaller, which simplifies the device structure, reduces device size, and lowers costs. Compared to existing on-chip optical waveguide amplifiers, the optical waveguide amplifier in this embodiment can be doped with various rare-earth ions, enabling the amplification of broadband signals and broadening its applicability.

The application discloses a kind of composite structure quantum dot nanoparticles and its preparation method and application, it is related to quantum dot material technical field.The application utilizes the coordination bond formed by halogen ion of rare earth halide and quantum dot surface metal ion, and rare earth ion fills up quantum dot surface electron defect, realizes surface passivation, improves quantum yield, simultaneously forms a layer of rare earth halide modification layer on quantum dot surface, optimizes the interface compatibility of quantum dot and subsequent metal oxide coating layer, avoids coating layer agglomeration and fluorescence quenching;Again, the quantum dot after modification is densely coated by metal oxide, and the quantum dot nanoparticles of rare earth halide-metal oxide double-layer protection are formed.Two-step modification is carried out under mild conditions, raw material is easy to obtain, and operation is simple, and the surface modification of rare earth halide can significantly improve the inherent quantum yield of quantum dot, and metal oxide coating realizes efficient water-oxygen barrier, and double-layer modification cooperatively improves the optical performance and stability of quantum dot, and is suitable for large-scale production.

The present application relates to a kind of rare earth element ion modified Pd base SSZ-13 molecular sieve composite material and its preparation method and application.The preparation method includes the following steps: after ammonium chloride and H-SSZ-13 molecular sieve are mixed, reaction is carried out, product is collected to obtain NH4 + -SSZ-13 molecular sieve;After NH4 + -SSZ-13 molecular sieve is mixed with palladium salt, rare earth element ion precursor salt, co-ion exchange reaction is carried out;Product is collected, grinds after calcination, and rare earth element ion-Pd / SSZ-13 composite material is obtained;Rare earth element ion-Pd / SSZ-13 composite material is hydrothermally aged, and the final rare earth element ion modified Pd base SSZ-13 molecular sieve composite material is obtained.Compared with prior art, the Pd base SSZ-13 molecular sieve composite material of the present application has excellent low-temperature NO x storage performance, high stability, small secondary pollution, and can be widely applied to the low-temperature efficient adsorption of NO x of motor vehicle exhaust cold start stage, and adapt to downstream SCR unit to realize NO x Deep removal.

This invention belongs to the field of laser glass fiber technology, and discloses a rare-earth ion spatially partitioned doped silicate glass fiber, its preparation method, and its application. The glass fiber includes a cladding and a core. The core is divided into two symmetrical semi-cylindrical regions along its diameter plane, designated as a first half-core and a second half-core. Both the first and second half-cores are made of rare-earth ion-doped silicate glass, and at least one of the rare-earth ions used in each is different. The silicate glass of this invention exhibits good mechanical properties, strong thermal stability, and good resistance to crystallization. (Yb doping...) 3+ and doped Nd 3+ The silicate laser glass fiber can achieve independent and efficient ion emission by using a single pump to excite or simultaneously excite the corresponding ions. Based on this fiber, an all-fiber optical path was designed and constructed, which can realize the independent and controllable output of two laser beams, 1034 nm (ytterbium ion generation) and 1064 nm (neodymium ion generation).

This invention belongs to the field of rare earth permanent magnet material preparation technology, and discloses a method for achieving deep grain boundary modification of thick rare earth permanent magnets using the pulsed current electromigration effect. In the preparation process, the magnet is placed in a grain boundary liquefaction state and a high-density DC pulsed current is applied. Using "electron driving force" as an additional vector driving force, heavy rare earth ions are forcibly propelled to migrate directionally into the interior of the magnet along the liquid grain boundaries. This driving force is constant and does not decrease with depth, thereby achieving "full transparency" modification of the thick magnet.

This invention discloses a process for recovering rare earth elements from low-concentration rare earth solutions. The process involves disassembling retired lithium-ion batteries after discharge to extract the negative electrode graphite material. This graphite is then heat-treated to remove organic binders, followed by acid leaching to obtain purified graphite. The purified graphite is then oxidized and intercalated to form graphene oxide, which is subsequently modified with sulfonate groups to obtain a sulfonated graphene oxide adsorbent. This adsorbent can selectively adsorb rare earth ions such as lanthanum in a sulfuric acid system containing aluminum impurities, exhibiting high adsorption capacity and selectivity. This invention features low-cost, simple, and environmentally friendly processes, achieving high-value conversion of retired lithium-ion battery negative electrode graphite and providing a low-cost solution for the green enrichment and recovery of low-concentration rare earth ions.

The application relates to the technical field of new materials, in particular to a preparation method and application of a rare earth molybdate ceramic material synthesized by a molten salt method. x MoO (3x+6) / 2 The application relates to the technical field of new materials, in particular to a preparation method and application of a rare earth molybdate ceramic material synthesized by a molten salt method. The method has the advantages of low reaction temperature, simple process, short synthesis time, low impurity residue, no pollution, low cost and the like, and can also synthesize a rare earth molybdate material doped with a luminescent rare earth ion; the luminescent performance of the material is further improved compared with that of a pure rare earth molybdate; and the material prepared by the method can be applied to the fields of environment-friendly dyes, ferroelectric materials, microwave ceramic materials, catalytic materials, luminescent materials or solid oxide fuel cells.