{"title":"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","authors":"Felix Eder, Alexandre Marsollier, Matthias Weil","doi":"10.1007/s00710-023-00814-5","DOIUrl":null,"url":null,"abstract":"<div><p>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. Na<sub>2</sub>[Ni<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·2.5H<sub>2</sub>O, K<sub>2</sub>[Ni<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·H<sub>2</sub>O, K<sub>2</sub>[Zn<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·2H<sub>2</sub>O, Rb<sub>1.25</sub>[Co<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·1.5H<sub>2</sub>O and Rb<sub>1.24</sub>[Mn<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·2H<sub>2</sub>O exhibit a unit-cell with hexagonal symmetry (<i>Z</i> = 2, <i>a</i> ≈ 9.3 Å,<i> c</i> ≈ 7.7 Å), in which most of the other compounds with a zemannite-type structure are known to crystallize. Relative to this unit-cell, K<sub>2</sub>[Cu<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·2H<sub>2</sub>O exhibits a twofold superstructure, K<sub>2</sub>[Co<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·2.5H<sub>2</sub>O a twofold superstructure with an additional incommensurate modulation, Na<sub>2</sub>[Cu<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·1.5H<sub>2</sub>O a threefold superstructure, and Rb<sub>1.5</sub>[Mn<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·1.25H<sub>2</sub>O and Cs[Mn<sub>2</sub>(TeO<sub>3</sub>)<sub>3</sub>]·H<sub>2</sub>O 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.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"145 - 163"},"PeriodicalIF":1.1000,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00814-5.pdf","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mineralogy and Petrology","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s00710-023-00814-5","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
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, Rb1.25[Co2(TeO3)3]·1.5H2O and Rb1.24[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 Rb1.5[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.
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.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
