Valence Distributions of Iron and Manganese in Pure, Manganese-doped and Calcium-doped Yttrium Orthoferrite

• 来源期刊: 中国化学（英文版）
• 学科: 化学
• 年，卷（期）: 2001,（3）
• 页码范围: 241-246
• 页数: 6页
• 分类号: O6
• 语种: 英文

摘要

The valence distributions of Fe and Mn in yttrium orthoferrite (YFeO3),YFe0.6 Mn0.4 O3 and Y0.9 Ga0.1 Fe0.6 Mn0.4 O3-δwere studied by the measurement of thermal power.Pure YFeO3 shows the n-type electrical conductivity associated with small polaron hopping between Fe2+ and Fe3+.Both YFe0.6Mn0.4-O3 and Y0.9 Ca0.1 Fe0.6 Mn0.4 O3-δshow n-type and p-type conductivities at high and low temperatures respectively associated with small poaron hopping between Mn3+ and Mn4+,iron has only oxidation state of Fe3+ and does not have contribution to the electrical conductivity.