Soft structure of cubic leucite compounds having controlled the nano-space and its lower thermal expansion property

控制纳米空间的立方白榴石化合物的软结构及其较低的热膨胀性能

基本信息

批准号：
16560587
负责人：
KOBAYASHI Hidehiko
金额：
$ 2.44万
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：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

We chose a cubic pollucite, CsA1Si_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 cesium leucite-based compounds, Cs_<1-x> Al_<1-x>Si_<2+x> O_6 (x=0.0-0.25), Cs_<1-x> Na_xAlSi_2O_6 (x=0.1-0.25), Cs_<0.9-x> Na_xAl_<0.9> Si_2O_6 (x=0.1-0.25), and Cs_<0.9-x> Li_xAl_<0.9> Si_<2.1> O_6 (x=0.1,0.2), were synthesized using multistep heat treatment. Their crystal structures were cubic, with space group Ia-3d, in the range of 298-1273K. 2. The variation in unit cell volume with temperature for each composition was showed that Cs_<0.8> Al_<0.8> Si_<2.2> O_6 and Cs_<0.75> Al_<0.75> Si_<2.25> O_6 had significantly smaller degrees of lattice … More thermal expansion than CsAlSi_2O_6 and Cs_<0.9> Al_<0.9> Si_<2.1> O_6 CsAlSi_2O_6, Cs_<0.9> Al_<0.9> Si_<2.1> O_6, Cs_<0.8> Al_<0.8> Si_<2.2> O_6 and Cs_<0.75> Al_<0.75> Si_<2.25> O_6 showed linear coefficients of thermal expansion of 2.7×10^<-6>, 2.2×10^<-6>, 1.5×10^<-6> and 1.1×10^<-6> K^<-1>, respectively, which are attributed to an increase in not only space ratio but also Al/Si ratio in the framework in the unit cell. 3. Structural phase transition was accompanied by a significant decrease in the Cs content of compounds of the Cs_<1-x> Al_<1-x> Si_<2+x> O_6 series. Cs_<0.8> AL_<0.8> Si_<2.2> O_6 and C_<s0.75> A_<l0.75> Si_<2.25> O_6 were cubic at 123 K from the XRD patterns and did not undergo structural phase transition. 4. Cesium sodium leucites and cesium lithium leucites showed a lower thermal expansion than that of cesium leucites. In particular, the thermal expansion of Cs_<0.7> Na_<0.2> Al_<0.9> Si_<2.1> O_6 decreased to 0.14% at 1273K and that of Cs_<0.7> Li_<0.2> Al_<0.9> Si_<2.1> O_6 decreased to 0.081% at 1273K. 5. The lattice thermal expansion behavior of the synthesized cubic (Cs,Na)-pollucite compounds was investigated by high-temperature XRD analysis in the temperature range of RT-1173 K and was found to show a gradual decrease with decreasing Cs content of Cs_<1-x> Na_xAlSi_2O_6 and Cs_<0.9-x> Na_xAl_<0.9> Si_<2.1>O_6 series. 6. The lattice thermal expansion behavior of the synthesized cubic (Cs,Na)-Leucite compounds, Cs_<1.0> Na_xAl_<1+x> Si_<2-x>O_6 and Cs_<1-x> Na_xAlSi_2O_6 (x=0.1,0.2,0.3) was found to attribute to not only Al/Si ratio in the framework but also arrengements of Cs^ + ion and Na^+ ion in the unit cell. Less

我们选择一种立方粉酸盐CSA1SI_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-柠檬岩化合物，并通过使用范围298-1273K的热量范围来合成固态反应方法，并使用同类范围的较高范围进行调查。 XRD。获得的结果可以总结如下。 1。基于Leucite的立方体化合物，CS_ <1-x> al_ <1-x> si_ <2+x> o_6（x = 0.0-0.25），cs_ <1-x> na_xalsi_2o_6（x = 0.1-0.25），CS_ <0.1-0.25 （x = 0.1-0.25）和CS_ <0.9-X> li_xal_ <0.9> si_ <2.1> o_6（x = 0.1,0.2），使用多步热处理合成。它们的晶体结构是立方体，含空间群IA-3D，范围为298-1273K。 2。每种组合物温度的单位细胞体积变化表明CS_ <0.8> al_ <0.8> si_ <2.2> o_6和cs_ <0.75> al_ <0.75> si_ <2.25> o_6的晶格比CSALSI_2O_______________________________________________________________________EN高得多。 O_6 CSALSI_2O_6，CS_ <0.9> Al_ <0.9> SI__ <2.1> O_6，CS_ <0.8> al_ <0.8> al_ <0.8> si_ <2.2> o_6和cs_ <0.75> al_ <0.75> al_ <0.75> si__ <2.25> si_ <2.25> o_6显示了热量系数的线性扩展。 2.2×10^<-6>，1.5×10^<-6>和1.1×10^<-6> k^<-1>分别归因于单位单元格中框架中的Al/si比不仅增加了Al/si的增加。 3。通过CS_ <1-X> al_ <1-x> SI_ <2+X> O_6系列的CS含量显着降低，实现了结构相变。 CS_ <0.8> Al_ <0.8> Si_ <2.2> O_6和C_ <S0.75> A_ <l0.75> SI__ <2.25> O_6在XRD模式的123 K处是Cubic，并且没有进行结构相变。 4。柠檬酸钠和柠檬酸锂的热膨胀低于叶菊的热膨胀。特别是，CS_ <0.7> Na_ <0.2> al_ <0.9> si_ <2.1> o_6的热膨胀在1273K时降至0.14％，而CS_ <0.7> li_ <0.2> li_ <0.2> al_ <0.9> si_ <0.9> si_ <2.11> si_ <2.1> o_6降至1273k下的0.081％降低至0.081％。 5. The lattice thermal expansion behavior of the synthesized cubic (Cs,Na)-pollucite compounds was investigated by high-temperature XRD analysis in the temperature range of RT-1173 K and was found to show a grade decrease with decreasing Cs content of Cs_<1-x> Na_xAlSi_2O_6 and Cs_<0.9-x> Na_xAl_<0.9> Si_ <2.1> O_6系列。 6。合成的立方体（CS，NA） - 葡萄球菌化合物的晶格热膨胀行为，CS_ <1.0> Na_xal_ <1+X> si_ <2-x> si_ <2-x> o_6 and cs_ <1x> x> x> na_xalsi_2o_6（x = 0.1,0.2,2,0.3），也不是ater rimiore and and ar/si riath and arterrenry and riater rian cartior inter righ yiro;单位单元格中的CS^ +离子和Na^ +离子较少的