Synthesis an Thermal Expansion Property of Cubic Cs2MSi5O12 (M=Cd, Ni, Zn) Powders
Synthesis an Thermal Expansion Property of Cubic Cs2MSi5O12 (M=Cd, Ni, Zn) Powders
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立方Cs2MSi5O12(M=Cd、Ni、Zn)粉末的合成及其热膨胀性能
DOI：
10.2109/jcersj.106.1099
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发表时间：
1998
影响因子：
1.1
通讯作者：
T. Mitamura
中科院分区：
文献类型：
--
作者：
I. Yanase;N. Miyashita;Hidehiko Kobayashi;F. Noguchi;T. Mitamura
采用两步热处理法在空气中合成了立方对称，空间群为Ia 3d的Cs_2MSi_5O_（12）（M=Cd，Ni，Zn）单晶。将混合原料粉末在973 ~ 1023 K下煅烧20 ~ 40 h，直至XRD识别出Cs_2MSi_5O_（12）（M=Cd，Ni，Zn）相，然后在1273 ~ 1473 K下加热20 h。采用高温X射线衍射法研究了合成的Cs2 MSi 5 O 12（M=Cd，Ni，Zn）粉末在298 ~ 1273 K的热膨胀行为。具有SiO 4/MO 4 ~（2-）=5的Cs_2MSi_5O_（12）（M=Cd、Ni、Zn）粉末在低温范围内显示出比具有SiO 4/MO 4 ~（2-）=2的CsMSi_2O_6（M=Al、Fe）粉末低的热膨胀。随着M2+离子半径的增加，合成的Cs2 MSi 5 O 12（M=Cd，Ni，Zn）在低温区的热膨胀系数增大。
Monolithic Cs2MSi5O12 (M=Cd, Ni, Zn) with cubic symmetry, space group Ia3d, was synthesized in air according to a two stage heat treatment. Mixed raw material powders were calcined at 973 to 1023K for 20 to 40h until the Cs2MSi5O12 (M=Cd, Ni, Zn) phase were recognized by XRD and then they were heated at 1273 to 1473K for 20h. The thermal expansion of the synthesized Cs2MSi5O12 (M=Cd, Ni, Zn) powders was investigated using high-temperature X-ray diffraction at 298 to 1273K. The Cs2MSi5O12 (M=Cd, Ni, Zn) powders having SiO4/MO42-=5, displayed a lower thermal expansion than those of CsMSi2O6 (M=Al, Fe) having SiO4/MO4-=2 in the low temperature range. With increasing the ionic radius of M2+, the thermal expansion coefficient of the synthesized Cs2MSi5O12 (M=Cd, Ni, Zn) was increased in the low temperature range.