9 results about "Valence electron" patented technology

A memory device and a manufacturing method thereof are provided. The memory device includes a magnetic tunneling junction (MTJ) and a spin Hall electrode (SHE). The MTJ includes a free layer, a reference layer and a barrier layer lying between the free layer and the reference layer. The SHE is in contact with the MTJ, and configured to convert a charge current to a spin current for programming the MTJ. The SHE is formed of an alloy comprising at least one heavy metal element and at least one light transition metal element. The heavy metal element is selected from metal elements with one or more valence electrons filling in 5d orbitals, and the light transition metal element is selected from transition metal elements with one or more valence electrons partially filling in 3d orbitals.

This application relates to the field of materials technology, specifically to a composite material, its preparation method, and its application. The composite material comprises organic molecules containing a conjugated structure and carbon materials containing π bonds, with the organic molecules loaded onto the surface of the carbon materials via non-covalent bonds. The carbon atoms in the composite material have four valence electrons, three of which are sp electrons. 2 One unbonded electron forms a π bond with a neighboring atom in a perpendicular direction. The π bond is in a half-filled state, which allows the π bond of the carbon material to interact with organic molecules with conjugated structures to form non-covalent C-H···π bonds. This enables organic molecules to be loaded onto the surface of the carbon material, greatly improving the catalytic activity of the composite material. It also gives the composite material good anti-agglomeration and stability, and makes the composite material easy to recycle after use.

A method for measuring a preferably static magnetic field is claimed, comprising the following steps in this order: i) Excitation of a valence electron of one or more alkali atoms (2) from a ground state to an initiation state in a manifold with principal quantum number n; ii) Application of a ½ control pulse to generate a superposition, preferably a uniformly distributed superposition, between the initiation state and a control state; iii) Application of a sequence of circulation pulses and one or more control pulses, preferably with specific time intervals, to shift the valence electron within the manifold of the initiation state; iv) Application of a further ½ control pulse for coherent mixing of the populations in the initiation state and control state; v) Measurement of the state of the valence electron, and preferably calculation of the magnetic field;

This invention discloses a design method and apparatus for refractory high-entropy alloys based on a large model, relating to the field of alloy material design technology. The method includes: First, by generating and collecting data, pre-trained surrogate models for thermodynamics (covering phase diagrams, solidification processes, etc.) and mechanical properties are constructed, and calculation models for physical parameters such as valence electron concentration and density are established. Then, these models are integrated into a single ensemble model, and a large language model is introduced as the core of intelligent scheduling. The large model is responsible for parsing the design task, intelligently planning and calling the interfaces of each model based on a knowledge base and rule base. Finally, based on the set design objectives, a multi-objective genetic algorithm is initiated for iterative optimization and adaptive adjustment, efficiently outputting a final alloy design scheme that meets multiple performance requirements. This invention enables intelligent multi-objective design of refractory high-entropy alloys, solving the problem of high dependence on manual intervention.

The invention relates to the technical field of novel metal materials, in particular to a novel light high-strength single-phase refractory high-entropy alloy based on machine learning design and a design and preparation method thereof, the alloy is composed of five elements of Cr, Mo, Ti, V and W, and the composition ranges (at.%) of the alloy are as follows: 5-25% of Cr, 5-15% of Mo, 25-35% of Ti, 20-35% of V and 5-20% of W. The invention further provides a design method of the single-phase refractory high-entropy alloy, according to the method, the yield strength of the single-phase refractory high-entropy alloy is predicted through a machine learning regression model, and the valence electron concentration and density are calculated through a mixing rule. And drawing a performance map based on the prediction data, and screening out a target component from the performance map for microstructure and mechanical property characterization. The as-cast structure of the high-entropy alloy provided by the invention is a single-phase BCC structure, and the high-entropy alloy has low density, high yield strength and good compression plasticity at room temperature.

The application discloses a kind of based on electronic density and distribution uniformity Fractal dimension calculation method and general detection device, belong to material microstructure characterization technical field.The method determines material chemical formula unit total price electron number, theoretical dense density and molar mass, detects actual density and calculates porosity;Collect surface topography gray data, calculate electronic distribution uniformity by normalized variance;Total price electron number density is calculated, combined with fitting proportion coefficient, and the fractal dimension is obtained by general formula.The detection device uses modular architecture, including basic parameter input, density detection, uniformity acquisition, main control calculation and result output module, each module can be independently replaced, and the main control module is built-in core algorithm.The application does not need large microscopes, realizes fast, low-cost detection, adapts to various solid materials, wide protection range, easy industrialization, solves the problems of high cost, complicated process, poor universality and easy to avoid in prior art.

The application provides a design and a preparation method of Ni3Al-based high-entropy aluminide with excellent strength-plasticity synergy, and relates to the technical field of component selection and preparation of advanced metal structural materials. The design needs to meet certain parameter criteria, which mainly include the enthalpy-entropy ratio based on a pseudo-binary sublattice model, atomic size difference: d0, electronegativity difference: Delta N, valence electron concentration deviation: Delta e, and total valence electron concentration: e0. Through component design, smelting and casting and cold deformation treatment, the controllable preparation of the Ni3Al-based high-entropy aluminide is realized, and the Ni3Al-based high-entropy aluminide has excellent performance, simple preparation process and low cost, and is suitable for large-scale industrial production.

The present application relates to the technical field of high polymer material, and particularly relates to a polyimide, a polyimide film and a laminate, a preparation method of the polyimide, and a flexible copper clad plate. The polyimide comprises residues of a dianhydride and residues of a diamine in a structural unit; wherein the diamine comprises a substituted or unsubstituted biphenyl diamine shown in formula (1), and the biphenyl diamine accounts for 80% to 100% of the total mass of the diamine; in the formula, R1-R8 are independently hydrogen atoms, fluorine atoms, trifluoromethyl groups, chlorine atoms or trichloromethyl groups, and at least one of R1-R8 is not a hydrogen atom; and the dianhydride is selected from one or more of 3,3',4,4'-biphenyl tetracarboxylic dianhydride, pyromellitic dianhydride and hexafluoro dianhydride. The polyimide provided by the present application increases the number of unsaturated conjugate bonds, introduces electron-withdrawing groups, and makes the valence electrons jump between different energy levels to form purple color. Formula (1).

This invention relates to a ZrNbMo-based multi-principal element alloy possessing both high strength and high ductility, and its preparation method, belonging to the field of alloy technology. The atomic percentage expression of the alloy is Zr a Nb b Mo c M d M is W, Ta, Fe, Co, or Cr, 40≤a<85, 10≤b≤30, 0<c<19, 0<d≤10, a>b≥c, and a+b+c+d=100; the alloy has a valence electron concentration of 4.1~4.7 and an average atomic mismatch of 0.027~0.072; the alloy is prepared by melting, homogenization, and short-time aging treatment, and is a single-phase BCC solid solution with a short-range ordered Nb-Mo / M structure in the alloy matrix. This invention combines a stable unidirectional structure with high valence electron concentration, shear modulus mismatch strengthening, atomic size suppression of precipitates, and specific heat treatment to achieve a synergistic improvement in the strength and plasticity of the alloy.