Suppression of Sequential Charge Transitions in Ca 0.5 Bi 0.5 FeO 3 via B-Site Cobalt Substitution
Suppression of Sequential Charge Transitions in Ca 0.5 Bi 0.5 FeO 3 via B-Site Cobalt Substitution
复制标题
通过 B 位钴取代抑制 Ca 0.5 Bi 0.5 FeO 3 中的连续电荷跃迁
DOI：
10.1021/acs.chemmater.8b02524
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发表时间：
2018
影响因子：
8.6
通讯作者：
Denis Romero F
中科院分区：
文献类型：
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作者：
Denis Romero F
钙钛矿型Ca0.5Bi0.5FeO3含有异常高价的Fe3.5+，其Fe中心依次发生电荷分离（CD）和Bi与Fe之间的位间电荷转移（CT）。从结构，磁性和输运性质的表征，我们发现，Co取代Fe发生isoelectric形成Ca0.5Bi3 + 0.5（Fe1-xCox）3.5 + O3和不稳定的CD状态。这导致材料在0.01 <x <0.67的区域中仅表现出金属间电荷转移行为。这些材料的CT转变仅涉及Fe 3.5+，而Co在所有温度下保持在3.5+氧化态。掺杂的Co~（3.5+）离子表现出类似保利顺磁的导电行为。的Co取代的效果是非常不同的观察到的CaFe 1-xCoxO3。
The perovskite Ca0.5Bi0.5FeO3containing unusually high-valent Fe3.5+undergoes sequentially charge disproportionation (CD) of the Fe centers and intersite charge transfer (CT) between Bi and Fe. From structural, magnetic, and transport property characterization, we found that substitution of Co for Fe occurs isovalently to form Ca0.5Bi3+0.5(Fe1–xCox)3.5+O3and destabilizes the CD state. This results in materials exhibiting only intermetallic charge transfer behavior in the region 0.01 <x< 0.67. The CT transitions for these materials only involve Fe3.5+, whereas Co remains in the 3.5+ oxidation state at all temperatures. The doped Co3.5+ions give Pauli-paramagnetic like conducting behavior. The Co-substitution effect is very different from that observed in CaFe1–xCoxO3.