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Synthesis and Characterization of the New Mixed Valent Compound Mn 5 VO 8
Author(s) -
Clemens Oliver,
Haberkorn Robert,
Kohlmann Holger,
Springborg Michael,
Beck Horst Philipp
Publication year - 2012
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201200021
Subject(s) - triclinic crystal system , monoclinic crystal system , crystallography , octahedron , crystal structure , ternary operation , manganese , characterization (materials science) , materials science , phase (matter) , chemistry , nanotechnology , metallurgy , organic chemistry , computer science , programming language
This work describes the synthesis and characterization of the new compound Mn 5 VO 8 . This phase is the only known ternary mixed valent compound in the system MnO‐Mn 2 O 3 ‐V 2 O 5 and crystallizes in a so far unknown crystal structure, which leads to coordination for the Jahn‐Teller cation Mn 3+ in distorted octahedra (elongated and compressed, respectively). The material can be prepared by solid state reaction at 900 °C in a monoclinic [ a = 19.5605(10) Å, b = 6.2184(3) Å, c = 5.4276(3) Å, β = 100.078(4)°, C2 / m , Z = 4] as well as in a triclinic [ a = 5.4320(2) Å, b = 6.2066(2) Å, c = 10.2443(4) Å, α = 107.035(3)°, β = 99.469(3)°, γ = 90.422(4)°, P $\bar{1}$ , Z = 2] modification, depending on the composition of the starting material mixture (7MnO + V 2 O 5 versus 0.5Mn 2 O 3 + 4MnO + 0.5V 2 O 5 ). Quantum mechanical calculations were carried out in order to get more detailed information on the material. Thereby, ionic charges could be assigned to the manganese atoms at the different crystallographic sites.