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Structural and Magnetic Properties of Ba 0.7 Sr 0.3 Ru 1− x Mn x O 3 Hexagonal Perovskites
Author(s) -
Yin Congling,
Li Guobao,
Lin Jianhua,
Attfield J. P.
Publication year - 2009
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200800469
Subject(s) - manganese , crystallography , x ray crystallography , materials science , strontium , physics , mineralogy , chemistry , diffraction , metallurgy , optics , nuclear physics
Tuning perovskites! A dramatic structural control of magnetic properties is reported in Ba 0.7 Sr 0.3 Ru 1− x Mn x O 3 hexagonal perovskites. These are spin‐glasses with freezing temperatures proportional to x in the 6H polytype up to x ≈0.5, but show high temperature antiferromagnetism in 4H phases at high x.The structures and properties of Ba 0.7 Sr 0.3 Ru 1− x Mn x O 3 perovskites have been investigated in samples prepared at 1300 °C in air. Two polytypes are found, a 6H phase for 0.2≤ x ≤0.4 and a 4H type for 0.6≤ x ≤1. The cell parameters and volume vary linearly in both solid solution ranges. Spin‐freezing transitions up to 60 K are observed for the 6H samples, but the 4H materials show high temperature Néel transitions at 210 to 280 K.