| 摘要 |
A material having a negative or low thermal expansion coefficient and composed substantially of a single crystal system is provided. The material is an oxide represented by the chemical formula ((R<SUP>4+</SUP>M<SUP>2+</SUP>)<SUB>1-x</SUB>A<SUP>3+</SUP><SUB>2x</SUB>)(QO<SUB>4</SUB>)<SUB>3 </SUB>(where R stands for at least one tetravalent metal element selected from Zr and Hf; M stands for at least one divalent metal element selected from Mg, Ca, Sr, Ba, and Ra; Q stands for at least one hexavalent metal element selected from W and Mo; and A stands for at least one trivalent metal element selected from Al, Sc, Y, Lu, Ga, and In; 0<x<1) and composed substantially of a single crystal system.
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