Structural studies on synthetic A2−x[M2(TeO3)3]·nH2O phases (A = Na, K, Rb, Cs; M = Mn, Co, Ni, Cu, Zn) with zemannite-type structures

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Mineralogy and Petrology Pub Date : 2023-04-15 DOI:10.1007/s00710-023-00814-5

Felix Eder, Alexandre Marsollier, Matthias Weil

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引用次数: 2

Abstract

During a systematic study on formation conditions of new compounds with zemannite-type structures, crystals of ten new oxidotellurate(IV) phases were grown under hydrothermal conditions, partially by employing a drastic reduction of the water content. The crystal structures of the obtained phases were determined by single-crystal X-ray diffraction. Na₂[Ni₂(TeO₃)₃]·2.5H₂O, K₂[Ni₂(TeO₃)₃]·H₂O, K₂[Zn₂(TeO₃)₃]·2H₂O, Rb_1.25[Co₂(TeO₃)₃]·1.5H₂O and Rb_1.24[Mn₂(TeO₃)₃]·2H₂O exhibit a unit-cell with hexagonal symmetry (Z = 2, a ≈ 9.3 Å, c ≈ 7.7 Å), in which most of the other compounds with a zemannite-type structure are known to crystallize. Relative to this unit-cell, K₂[Cu₂(TeO₃)₃]·2H₂O exhibits a twofold superstructure, K₂[Co₂(TeO₃)₃]·2.5H₂O a twofold superstructure with an additional incommensurate modulation, Na₂[Cu₂(TeO₃)₃]·1.5H₂O a threefold superstructure, and Rb_1.5[Mn₂(TeO₃)₃]·1.25H₂O and Cs[Mn₂(TeO₃)₃]·H₂O a fourfold superstructure. Disorder of the alkali metal cations and crystal water molecules in the channels as well as variable water contents complicate modelling and structure refinement.

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结构研究合成A2−x [M2 (TeO3) 3]·nH2O phases (A = Na, K, Rb, Cs;M = Mn, Co, Ni, Cu, Zn)与zemannite-型结构

在系统地研究新化合物的形成条件中，有十种新的氧化碲酸盐(IV)相的晶体在水热条件下生长，部分是通过大幅度降低含水量。所得相的晶体结构通过单晶x射线衍射测定。Na2[Ni2(TeO3)3]·2.5H2O, K2[Ni2(TeO3)3]·H2O, K2[Zn2(TeO3)3]·2H2O, Rb1.25[Co2(TeO3)3]·1.5H2O和Rb1.24[Mn2(TeO3)3]·2H2O表现为六方对称的单元胞(Z = 2, a≈9.3 Å， c≈7.7 Å)，其中大多数具有zemanite型结构的化合物在其中结晶。相对于此单元胞，K2[Cu2(TeO3)3]·2H2O表现为双重上层结构，K2[Co2(TeO3)3]·2.5H2O表现为双重上层结构，Na2[Cu2(TeO3)3]·1.5H2O表现为三重上层结构，Rb1.5[Mn2(TeO3)3]·1.25H2O和Cs[Mn2(TeO3)3]·H2O表现为四重上层结构。通道中碱金属阳离子和结晶水分子的无序以及含水量的变化使建模和结构精细变得复杂。

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来源期刊

Mineralogy and Petrology 地学-地球化学与地球物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered. Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.