A Mero-Plesiotype Series of Vanadates, Arsenates, and Phosphates with Blocks Based on Densely Packed Octahedral Layers as Repeating Modules

The family of layered vanadates, arsenates, and phosphates is discussed in terms of a modular concept. The group includes minerals vésignéite and bayldonite, and a number of synthetic analogous and modifications which are not isotypic, but their crystal structures comprise similar blocks (modules) c...

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Published inMinerals (Basel) Vol. 11; no. 3; p. 273
Main Authors Yakubovich, Olga, Kiriukhina, Galina
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2021
Subjects
Anions
Antiferromagnetism
antiferromagnets
Arsenates
Atomic properties
Copper
Crystal structure
Magnetic properties
Magnets
Manganese
Minerals
modular structures
Modules
Nickel
Oxygen atoms
Phosphates
polysomes (series)
Substructures
synthetic analogues of minerals
Tetrahedra
transition metal phosphates
Vanadates
Voids
X-ray diffraction
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Summary:The family of layered vanadates, arsenates, and phosphates is discussed in terms of a modular concept. The group includes minerals vésignéite and bayldonite, and a number of synthetic analogous and modifications which are not isotypic, but their crystal structures comprise similar blocks (modules) consisting of a central octahedral layer filled by atoms of d elements (Mn, Ni, Cu, or Co) and adjacent [VO4], [AsO4], or [PO4] tetrahedra. The octahedral layers are based on the close-packing of oxygen atoms. Within these layers having the same anionic substructure, the number and distribution of octahedral voids are different. In the crystal structures of compounds participating in the polysomatic series, these blocks alternate with various other structural fragments. These circumstances define the row of structurally-related vanadates, arsenates, and phosphates as a mero-plesiotype series. Most of the series members exhibit magnetic properties, representing two-dimensional antiferromagnets or frustrated magnets.
ISSN:2075-163X
2075-163X
DOI:10.3390/min11030273