Affiliation:
1. Institut für Anorganische und Analytische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58. D-6300 Gießen
Abstract
Single crystals of dark blue MnF4 have been obtained by high pressure fluorination (pF2 = 3 kbar) of MnF2. There exist two modifications: α-MnF4 crystallizes tetragonally body centered with a = 12.63(1), c = 6.049(5) Å, space group I41/a-C4h
6 (No. 88). Z = 16; the structure of β-MnF4, (probably) rhombohedral with a = 19.56(2). c = 13.00(1) Å, Z = 72, is yet unknown in detail. MnF4 is paramagnetic with ,μeff (301.2 K) = 3.87 B. M. . The Curie-Weiss law is obeyed down to 22.4 K; the Madelung Part of lattice energy (MAPLE) is calculated to be 2475 kcal/mol.
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