Solid Solutions of Pauli-Paramagnetic CaCu3V4O12 and Antiferromagnetic CaMn3V4O12

详细信息    查看全文

• 作者：Shoubao Zhang ; Takashi Saito ; Wei-Tin Chen ; Masaichiro Mizumaki ; Yuichi Shimakawa
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：September 16, 2013
• 年：2013
• 卷：52
• 期：18
• 页码：10610-10614
• 全文大小：344K
• 年卷期：v.52,no.18(September 16, 2013)
• ISSN：1520-510X

文摘

Solid solutions of Pauli-paramagnetic CaCu₃V₄O₁₂ and antiferromagnetic CaMn₃V₄O₁₂ were prepared by a high-pressure synthesis technique. All samples crystallized in the A-site-ordered perovskite structure with isovalent Cu²⁺ and Mn²⁺ ions at the square-planar A鈥?site. The V ion at the B site kept a charge state close to +4 in all of the solid solutions, and the electrons of V were delocalized and contributed to the metallic properties. The substitution of Mn²⁺ for Cu²⁺ in CaCu₃V₄O₁₂, where both Cu and V electrons were delocalized, produced the S = ⁵/₂ localized moments, and the spins at the Mn site interacted antiferromagnetically. Spin-glass-like magnetic behaviors due to the random distribution of Cu/Mn ions at the A鈥?site were observed at intermediate compositions of the solid solution, whereas the antiferromagnetic transition was observed at the end composition CaMn₃V₄O₁₂.