| 摘要 |
A low expansion ceramic material has a composition represented by the molecular formula i (Na) j (Zr2-zNa4z) k (P3-xNaxSix)O12 in which the molar proportions i, j and k are each within the range from about 0.9 to about 1.1, and i+j+k equal 3; and, for molar proportions i, j and k each equal to 1.0, the ceramic composition falls within the area defined by the points A, B, C and D in a quarternary diagram of SiO2, Na2O, P2O5 and ZrO2, the coordinates of the points being: A: x=0.2, z=0 B: x=0.6, z=0 C: x=0, z=0.25 D: x=0, z=0.125 The ceramic material is especially suitable as a substrate for optically reflecting films.
|
