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首页> 外文期刊>Mineralogical Magazine >High-temperature synchrotron X-ray powder diffraction study.of Cs_2XSi_5O_(12)(X = Cd, Cu, Zn) leucites
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High-temperature synchrotron X-ray powder diffraction study.of Cs_2XSi_5O_(12)(X = Cd, Cu, Zn) leucites

机译:Cs_2XSi_5O_(12)(X = Cd,Cu,Zn)白云母的高温同步辐射X射线粉末衍射研究

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Synchrotron X-ray powder diffraction data have been collected on three synthetic leucite analogues with the general formula Cs_2XSi_5O_(12) (X= Cd, Cu, Zn) between 295 and 1173 K. All three samples have the orthorhombic Pbca leucite structure at room temperature with ordered framework T-site cations. The sample with X = Cd retains the Pbca structure over the whole of the investigated temperature range. The sample withX= Cu also retains the Pbca structure, but there is a transition to a less distorted structure with a larger unit-cell volume at ~333 K. The sample with X= Zn shows evidence for a transition to a previously unknown Pa3 cubic structure, with some T-site cation disorder, at 566 K, on heating. This transition is reversible on cooling to 633 K.
机译:同步加速器X射线粉末衍射数据已收集在295至1173 K之间的三种通式为Cs_2XSi_5O_(12)(X = Cd,Cu,Zn)的合成白云母类似物。所有三个样品在室温下均具有正交晶Pbca白云母结构有序的框架T位阳离子。 X = Cd的样品在整个研究温度范围内都保留了Pbca结构。 X = Cu的样品也保留了Pbca结构,但在〜333 K处有向较小扭曲结构的过渡,具有较大的晶胞体积。X = Zn的样品显示了向先前未知的Pa3立方的过渡的证据。加热时在566 K下具有一些T-位阳离子异常的结构。冷却至633 K时,此转变是可逆的。

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