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Synthesis of New Amorphous Metallic Spin Glasses M 2 SnTe 4 (MCr, Mn, Fe, Co): Solvent Induced Metal‐Insulator Transformations
Author(s) -
Haushalter Robert C.,
O'Connor Charles M.,
Haushalter Jeanne P.,
Umarji Arun M.,
Shenoy Gopal K.
Publication year - 1984
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198401691
Subject(s) - anhydrous , amorphous solid , materials science , metal , amorphous metal , transition metal , electrical resistivity and conductivity , inorganic chemistry , solvent , crystallography , analytical chemistry (journal) , chemistry , metallurgy , organic chemistry , electrical engineering , engineering , catalysis
Precipitation of amorphous metallic spin glasses from solution is a novel, potentially general method. By this means, main‐group metal polyanions are oxidized by transition‐metal cations. The example which has been studied in most detail is Fe 2 SnTe 4 . This forms immediately as a black precipitate when methanolic solutions of anhydrous FeBr 2 and K 4 SnTe 4 are mixed at −20°C. The resistivity of pressed powder samples is low. In the presence of strong donor ligands, the FeTe bonds are selectively cleaved. Solid [Fe(en) 2 ] 2 SnTe 4 (orange) is an insulator.