Design for Ultra Low Thermal Expansion Properties of Cubic Cs-leucite Compounds

立方铯白榴石化合物超低热膨胀性能的设计

基本信息

批准号：
12650666
负责人：
KOBAYASHI Hidehiko
金额：
$ 1.73万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

We chose a cubic pollucite, CsAlSi_2O_6, as a template compound, and report that the cubic Cs-leucite compounds with various chemical compositions can be synthesized by multi-step heating process as a solid-state reaction method, and that the thermal expansion properties in the range 298-1273K for all of the synthesized compounds were examined by using low- and high-temperature XRD.The results obtained can be summarized as follows.1. Cubic Cs-leucite compounds ; Cs-leucites : CsMSi_2O_6(M=B,Al,Fe,B_<0.2>Al_<0.8>,Al_<0.5>Fe_<0.5>,Al_<0.2>Fe_<0.8>), Cs_2MSi_5O_<12>(M=Cd,Fe,Mg,Ni,Zn), Cs-Na-leucites : Cs_<1-X>Na_XASI_2O_6(X=0.1,0.2), Cs_<0.9-XNa_X>Al_<0.9>Si_<2.1>O_6(X=0.1,0.2), and RbAlSi_2O_6, can be successfully synthesized by the multi-step heat treatment.Their crystal structures, as determined by XRD analysis, were found to belong to space group Ia-3d of the cubic crystal system in the range 298-1273K.2. The thermal expansion rates of the synthesized cubic Cs-leucite compounds were clearly varied with the chemical composition of Cs-leucite compounds. In addition, the effect of the substitution of alkaline metalion of which ionic radius was smaller than Cs^+ ion led to the enhanced low thermal expansion rates of the cubic Cs-lecuite compounds.3. The thermal expansion rates of the cubic Cs-leucite compounds ; Cs-leucites, Cs-Na-leucites and Cs-Li-leucites were changed by not only the amount of Cs^+ ions but also the space ratio owing to the difference of the cation size between Cs^+ ions and Na^+ or Li^+ ions.4. The Windows95/98/NT application softwares can use the CIF as the crystal structure data was developed to simplify a display of complex crystal structure such as silicate compounds using the coordination polyhedron.5. The thermal expansion rates of the synthesized cubic Cs_<0.8>Li_<0.1Al_<0.9>Si_<2.1>O_6 and Cs_<0.7>Li_<0.2>Al_<0.9>Si_<2.1>O_6were 0.11% at 1173K and 0.081 % at 1073K, which were lower than that of Cs_<0.9>Al_<0.9>Si_<2.1>O_6, 0.2 % at 1273K.

我们选择了一种立方粉状粉，CSALSI_2O_6作为模板化合物，并报告说，可以通过多步加热过程作为固态反应方法来合成具有各种化学成分的立方CS亮氨酸化合物，并且可以合成。通过使用低温XRD检查了所有合成化合物的298-1273K范围。所获得的结果可以汇总如下1。立方CS-石化合物； CS-Leucites：CSMSI_2O_6（M = B，Al，Fe，B_ <0.2> Al_ <0.8>，Al_ <0.5> Fe_ <0.5>，Al_ <0.2> Fe_ <0.8>），CS_2MSI_5O_ <12>（M = CD），Fe，Mg，Ni，Zn），CS-Na-Leucites：CS_ <1-X> Na_xasi_2o_6（X = 0.1,0.2），CS_ <0.9-XNA_X> al_x> al_ <0.9> si__ <2.1> si_ <2.1> o_6（x = 0.1 = 0.1 = 0.1 = 0.1 = 0.1 ，0.2）和rbalsi_2O_6可以通过多步热处理成功合成。通过XRD分析确定的晶体结构属于范围298-1273K中立方晶体系统的空间群IA-3D .2。合成的立方CS-石晶体化合物的热膨胀速率与CS-芝麻酸化合物的化学成分明显变化。另外，离子半径小于CS^+离子的碱性金属取代的效果导致了立方CS-纽扣化合物的低热膨胀速率增强。3。立方CS-橄榄石化合物的热膨胀速率； CS-柠檬酸，CS-Na-柠檬酸和CS-li-Liucites不仅通过CS^+离子的量更改，而且由于CS^+离子和Na^+或Na^+或Na^+或Na^+或Na^+或li^+ ions.4。 Windows95/98/NT应用程序软件可以使用CIF，因为开发了晶体结构数据来简化复杂的晶体结构的显示，例如使用协调polyhedron.5。合成的立方CS_ <0.8> li_ <0.1Al_ <0.9> si_ <2.1> o_6和cs_ <0.7> li_ <0.2> al_ <0.2> al_ <0.9> si_ <2.1> si_ <2.1> o_6，在1173k和0.081％处，在1173k和0.081％， 1073K，低于CS_ <0.9> Al_ <0.9> Si_ <2.1> O_6，1273K时0.2％。