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Valence Distributions of Iron and Manganese in Pure, Manganese‐doped and Calcium‐doped Yttrium Orthoferrite
Author(s) -
Cao XueQiang,
Zeng Yue
Publication year - 2001
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20010190306
Subject(s) - orthoferrite , chemistry , polaron , yttrium , manganese , valence (chemistry) , doping , electrical resistivity and conductivity , conductivity , condensed matter physics , analytical chemistry (journal) , magnetization , oxide , electron , magnetic field , physics , organic chemistry , engineering , quantum mechanics , chromatography , electrical engineering
The valence distributions of Fe and Mn in yttrium orthoferrite (YFeO,), YFe 0.6 Mn0.4O3 and Y 0.9 Ca 0.1 Fe 0.6 Mn 0.4 O 3.8 were studied by the measurement of thermal power. Pure YFeO 3 shows the n‐type electrical conductivity associated with small polaron hopping between Fe 2+ and Fe 3+ . Both YFe 0.4 Mn 0.4 ‐O 3 and Y 0–9 Ca 0–1 .Fe 0–6 Mn 0–4 O 3–8 show n‐type and p‐type conductivities at high and low temperatures respectively associated with small polaron hopping between Mn 3+ and Mn 4+ , iron has only oxidation state of Fe 3+ and does not have contribution to the electrical conductivity.