Crystallogenetic Systematization of Phosphates, Arsenates, and Vanadates with \([{{\text{O}}_{n}}M_{m}^{2+}]\) (M²⁺ = Cu, Zn, Ni, Fe, Ca, Sr) Complexes of Oxo-Centered Tetrahedra

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2025年7月1日

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V. V. Bakakin

摘要

Abstract

A comparative analysis of the crystal structures of the M²⁺ series of phosphates, arsenates, and vanadates containing complexes of oxo-centered tetrahedra (OCCs) is reported. OCCs are considered as structural subunits forming strong polycationic fragments, and the structures are described in the cation-matrix representation. We propose a systematisation of OCC types in “pure” M²⁺ saltoxides and in more complex compositions formed by their combinations with M₃(TO₄)₂ salt fragments, large M⁺ cations, Cl^– anions, H₂O molecules. The systematic review contains five groups; different composition variants are reasonably related to OCC types. Oxido-salt associates and other components are differentiated (spatially separated) in almost all structures. Comparison with OCC sulfate-molybdate structures is performed, and it is shown that the fact that the anionic OCC partners ((TO₄)^3– or (TO₄)^2–) have different charges is a crucially important difference.

Crystallogenetic Systematization of Phosphates, Arsenates, and Vanadates with \([{{\text{O}}_{n}}M_{m}^{2+}]\) (M2+ = Cu, Zn, Ni, Fe, Ca, Sr) Complexes of Oxo-Centered Tetrahedra

摘要

Crystallogenetic Systematization of Phosphates, Arsenates, and Vanadates with \([{{\text{O}}_{n}}M_{m}^{2+}]\) (M²⁺ = Cu, Zn, Ni, Fe, Ca, Sr) Complexes of Oxo-Centered Tetrahedra