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
Abstrak
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 with 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.
Penulis (3)
Felix Eder
Alexandre Marsollier
Matthias Weil
Akses Cepat
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Cek di sumber asli →- Tahun Terbit
- 2022
- Bahasa
- en
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- Sumber Database
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- DOI
- 10.21203/rs.3.rs-2222507/v1
- Akses
- Open Access ✓