Lithium-Doped Copper Vanadium Oxide for Negative Thermal Expansion
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Solution Overview
Problem
The copper vanadium composite oxide has a low linear coefficient of expansion compared to zirconium phosphate tungstate, and while it is produced from lower-price raw materials and is water-resistant, it requires further improvement in negative thermal expansion characteristics.
Innovation Solution
A negative thermal expansion material is developed by dissolving Li atoms in a copper vanadium composite oxide, represented by the general formula (CuxMy)(VaPb)Ot, where M is a metallic element with an atomic number of 11 or more, and specific ranges for x, y, a, b, t, x+y, and a+b are defined to enhance negative thermal expansion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If copper vanadium composite oxide is used as a negative thermal expansion material, then it can be produced from lower-price raw materials and is water-resistant, but its negative thermal expansion characteristics are insufficient compared to zirconium phosphate tungstate
Solution Approach 1:
The invention changes the chemical composition parameters of the copper vanadium composite oxide by incorporating lithium atoms and substituting metal atoms (M) into the crystal structure. This modifies the base material's properties to enhance negative thermal expansion characteristics while maintaining the cost-effectiveness and water resistance of the original copper vanadium composite oxide system
Solution Approach 2:
The invention creates a composite material system by combining copper vanadium composite oxide with lithium atoms and substituting metal elements (M). This composite approach integrates the advantages of the base material (low cost, water resistance) with the enhanced thermal expansion properties of the added components, achieving both economic and performance goals
2Reliability
If zirconium phosphate tungstate is used to achieve better negative thermal expansion characteristics, then the linear coefficient of expansion is improved, but the raw material cost increases and water resistance decreases
Solution Approach 1:
The invention uses inexpensive copper vanadium composite oxide as the base material instead of costly zirconium phosphate tungstate, achieving cost-effectiveness. The material is enhanced through atomic-level modifications (lithium incorporation and metal substitution) rather than using inherently expensive raw materials, thereby maintaining economic advantages while improving performance
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 resulting negative thermal expansion material exhibits improved negative thermal expansion characteristics, with a reduced coefficient of thermal expansion, making it suitable for industrial applications where precise thermal management is required.
Implementation Method 1
a negative thermal expansion material, comprising a copper vanadium composite oxide dissolving Li atoms
Implementation Method 2
materials that contract and exhibit negative thermal expansion upon heating
Data Source
AI summary
An object of the present invention is to provide a negative thermal expansion material having better negative thermal expansion characteristics. The present invention is a negative thermal expansion material, comprising a copper vanadium composite oxide dissolving Li atoms and represented by the following general formula (1):(CuxMy)(VaPb)Ot. In the general formula (1), M represents a metallic element with an atomic number of 11 or more other than Cu and V, 1.60≤x≤2.40, 0.00≤y≤0.40, 1.60≤a≤2.40, 0.00≤b≤0.40, 5.00≤t≤9.00, 1.60≤x+y≤2.40, and 1.60≤a+b≤2.40.