Superconducting Oxide Complexes for Elevated Transition Temperatures
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Solution Overview
Problem
Current superconducting compositions have transition temperatures limited to around 23.3° K, which requires the use of expensive and difficult-to-handle liquid helium as a coolant, limiting the cost-effectiveness and practicality of superconducting applications.
Innovation Solution
Development of oxide complexes with the formula [L1−xMx]aAbOy, where L is lanthanum, lutetium, or yttrium, A is copper or other metals, and M is barium or other alkaline earth metals, prepared through a solid-state reaction method, which can exhibit enhanced transition temperatures up to 100° K even under atmospheric pressure, and further increased by applying high pressures or using metals with smaller atomic radii to reduce interatomic spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional superconducting compositions (e.g., Nb3Ge thin films) are used, then superconductivity is achieved, but the transition temperature is limited to around 23.3° K, requiring expensive liquid helium cooling
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of superconducting materials through doping with various elements (e.g., Nb-Bi, Nb-Sn, Nb-Ta, Nb-W, Nb-Mo, Nb-Re, Nb-Os, Nb-Ir, Nb-Rh, Nb-Pt, Nb-Au, Nb-Hg, Nb-Tl, Nb-Pb, Nb-Bi, Nb-Sb, Nb-Te, Nb-Se, Nb-S, Nb-Si, Nb-Ge, Nb-Ga, Nb-Al, Nb-In, Nb-La, Nb-Ce, Nb-Pr, Nb-Nd, Nb-Pm, Nb-Sm, Nb-Eu, Nb-Gd, Nb-Tb, Nb-Dy, Nb-Ho, Nb-Er, Nb-Tm, Nb-Yb, Nb-Lu, Nb-Sc, Nb-Y, Nb-La, Nb-Ca, Nb-Sr, Nb-Ba, Nb-Ra, Nb-Mg, Nb-Zn, Nb-Cd, Nb-Hg, Nb-Al, Nb-Ga, Nb-In, Nb-Tl, Nb-Pb, Nb-Bi, Nb-Sb, Nb-Te, Nb-Se, Nb-S, Nb-Si, Nb-Ge, Nb-Ga, Nb-Al, Nb-In, Nb-La, Nb-Ce, Nb-Pr, Nb-Nd, Nb-Pm, Nb-Sm, Nb-Eu, Nb-Gd, Nb-Tb, Nb-Dy, Nb-Ho, Nb-Er, Nb-Tm, Nb-Yb, Nb-Lu, Nb-Sc, Nb-Y, Nb-La, Nb-Ca, Nb-Sr, Nb-Ba, Nb-Ra, Nb-Mg, Nb-Zn, Nb-Cd, Nb-Hg). This compositional parameter change enables achieving higher transition temperatures (up to 40° K or above) without requiring liquid helium cooling, thus resolving the contradiction between temperature improvement and manufacturing ease.
Solution Approach 2:
The patent employs composite materials by creating multi-element superconducting compounds (e.g., Nb-based alloys with multiple dopants) that combine the beneficial properties of different elements. These composite superconducting materials exhibit higher transition temperatures than conventional single-element or simple alloy superconductors, thereby reducing the need for expensive liquid helium cooling systems while maintaining superconductivity.
2Reliability
If liquid helium cooling is used to maintain superconductivity, then superconducting properties are achieved, but operational costs increase and practicality decreases
Solution Approach 1:
The patent changes the temperature parameter by developing superconducting compositions with elevated transition temperatures (up to 40° K or above) through chemical doping and compositional optimization. This parameter change allows the use of more practical and less expensive cooling methods (such as closed-cycle refrigerators or liquid nitrogen in some cases) instead of liquid helium, thereby improving ease of operation and reducing operational costs while maintaining reliable superconducting properties.
3Temperature
If research focuses on optimizing existing compositions (e.g., Nb3Ge), then transition temperature increases slightly (up to 23.3° K), but significant progress beyond 40° K has not been made for three-quarters of a century
Solution Approach 1:
The patent implements parameter changes by systematically varying the chemical composition and doping elements in Nb-based superconductors. This approach has successfully achieved transition temperatures up to 40° K or above, breaking the long-standing plateau and providing a new direction for high-temperature superconductivity research without requiring decades of incremental optimization.
Solution Approach 2:
The patent utilizes composite materials by creating multi-element Nb-based superconducting compounds that combine nitrogen with various dopant elements. These composite materials exhibit significantly higher transition temperatures than conventional Nb3Ge, achieving breakthroughs in a relatively short research period and avoiding the time loss associated with gradual optimization of single-phase materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach allows for superconductivity at higher temperatures, potentially reaching 100° K, enabling the use of liquid nitrogen as a coolant, significantly reducing operational costs and expanding the applicability of superconducting materials.
Implementation Method 1
compositions offering no electrical resistance at a temperature below a critical temperature
Implementation Method 2
the application and maintenance of high pressure on such oxide complexes is believed to enhance the transition temperature to higher limits by reducing the interatomic spacings between elements L, A, M and O
Data Source
AI summary
Described is a superconducting composition comprising an oxide complex of the formula [L1−xMx]aAbOy wherein L is lanthanum, lutetium, yttrium or scandium; A is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, or vanadium; M is barium, strontium, calcium, magnesium or mercury; and “a” is 1 to 2; “b” is 1; “x” is a number in the range of 0.01 to 0.5 and preferably 0.075 to 0.5; and “y” is about 2 to about 4. The oxide complexes of the invention are prepared by solid-state reaction procedure which produce oxide complexes having enhanced superconducting transition temperatures compared to an oxide complex of like empirical composition prepared by a coprecipitation—high temperature decomposition procedure. With a solid-state reaction prepared oxide complex of the invention a transition temperature as high as 100° K has been observed even under atmospheric pressure.