MAGNETIC PROPERTIES OF SEVERAL METASILICATES AND METAGERMANATES WITH PYROXENE STRUCTURE

Manganese metasilicate and manganese, ferrous and cobalt metagermanates with pyroxene structure were prepared by usual ceramic techniques. Ferrous and cobalt metasilicates were synthesized under high pressure. The magnetic susceptibilities of the eight pyroxenes were measured in the temperature range from 4.2 to 300°K. All of these pyroxenes are antiferromagnetic at low temperatures. The Néel temperatures of MnSiO3, MnGeO3, CoSiO3, and CoGeO3 are respectively 7°K, 10°K, 50°K and 41°K. The susceptibility-temperature curves for FeSiO3 and FeGeO3 show two peaks. They are discussed on the basis of a simple molecular field approximation. © 1968, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.