| 摘要 |
Compounds that satisfy the general formula A1-Y4+AY1+AY3+V2-XEXO7 exhibit isotropic NTE behavior above a temperature of about 100 DEG C. Y is from about 0.0 to about 0.4, and more preferably is about 0.2. X is from about 0.6 to about 1.4, and is more preferably about 1. Particularly suitable NTE compounds have X about 1 and Y about 0. A4+ is selected from the group consisting of Hf, Zr, ZraMb, HfaMb and mixtures thereof wherein a plus b equals one and M is selected from the group consisting of Ti, Ce, Th, U, Mo, W, Pb, Sn, Ge and Si. More preferably, A4+ is selected from the group consisting of Hf and Zr. A1+ is selected from the group consisting of the alkali earth metals, A3+ is selected from the group consisting of the rare earth metals, and E is selected from the group consisting of P and As. The NTE materials may be incorporated into compositions such as epoxy and ceramic compositions.
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