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Crystal chemistry and Raman spectroscopy of two synthetic sodalite-type aluminosilicates with [MoO 4 ] 2− and [WO 4 ] 2− groups
Physics and Chemistry of Minerals ( IF 1.2 ) Pub Date : 2021-04-12 , DOI: 10.1007/s00269-021-01144-8
Nadezhda V. Shchipalkina , Natalia N. Zubkova , Alexey R. Kotelnikov , Natalia N. Koshlyakova , Igor V. Pekov , Dmitry A. Ksenofontov , Sergey N. Britvin

The synthetic nosean- and haüyne-like aluminosilicates with (MoO4)2− and (WO4)2− extra-framework anions were synthesized in H2O-bearing systems (3 kbar, 750 °C) and studied by means of electron microprobe analysis, Raman spectroscopy, powder and single-crystal X-ray diffraction. The nosean-like phase contains up to 10.6 wt% MoO3 and up to 5.1 wt% WO3; the maximum content of MoO3 in the haüyne-like phase is 22.5 wt%. The nosean-like phase with (MoO4)2− and (WO4)2− is cubic, P-43m, a = 9.1278(10) Å, V = 760.498(14) Å3, Z = 1. This compound with the crystal chemical formula Na7.68[(Al,Si)12O24] {[(Mo0.65W0.35)O4]0.780.22}·H2O has a disordered Al/Si framework, that is caused by the high temperature of crystallization (t = 750 °C) with further quenching at room temperature. Despite the same conditions of synthesis, the haüyne-like phase with (MoO4)2−, Na5.12Ca1.92[Al6Si6O24](MoO4)1.52 has an Al/Si-ordered framework. Its space group is P-43n, a = 9.1516(4) Å, V = 766.46(6) Å3, Z = 1. In both synthesized sodalite-type aluminosilicates the anion groups (MoO4)2− and (WO4)2− are dynamically disordered. The polarized Raman spectra of both aluminosilicates show that Raman-active modes of (MoO4)2− and (WO4)2− correspond to vibrations of tetrahedral anions with symmetry Td. The presence of H2O was fixed only in the nosean-like compound and no preferred orientation of water molecule was detected.



中文翻译:

两种具有[MoO 4] 2−和[WO 4] 2−基团的合成方钠石型硅铝酸盐的晶体化学和拉曼光谱

在(H 2 O)轴承体系(3 kbar,750°C)下合成具有(MoO 42−和(WO 42−骨架外阴离子的合成的类似鼻和Haüyne的铝硅酸盐,并通过电子进行研究微探针分析,拉曼光谱,粉末和单晶X射线衍射。鼻状样相含有至多10.6重量%的MoO 3和至多5.1重量%的WO 3。类Haüyne相中MoO 3的最大含量为22.5 wt%。(MoO 42−和(WO 42−的鼻状相为立方,P -43 m一个 = 9.1278(10)A,V  = 760.498(14)一种3ž  = 1。这化合物与晶体化学式的Na 7.68 [(铝,硅)12 ö 24 ] {[(沫0.65 w ^ 0.35)O 4 ] 0.780.22 }·H 2 O具有无序的Al / Si骨架,这是由高温结晶(t  = 750°C)并在室温下进一步淬火引起的。尽管具有相同的合成条件,但具有(MoO 42−,Na 5.12 Ca 1.92的类哈伊恩相[Al 6 Si 6 O 24 ](MoO 41.52具有Al / Si有序框架。其空间群为P -43 Ñ一个 = 9.1516(4),V  = 766.46(6)3ž  = 1。在这两种合成方钠石型铝硅酸盐的阴离子基团(的MoO 42-和(WO 42−是动态无序的。两种硅铝酸盐的极化拉曼光谱均显示(MoO 42−和(WO 42−的拉曼活性模式对应于对称性为T d的四面体阴离子的振动。H 2 O的存在仅在鼻状化合物中固定,并且未检测到水分子的优选取向。

更新日期:2021-04-12
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