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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A new LaCo0.71(1)V0.29(1)O2.97(3) perovskite containing vanadium in octahedral sites: synthesis
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A new LaCo0.71(1)V0.29(1)O2.97(3) perovskite containing vanadium in octahedral sites: synthesis

机译：八面体位点中含钒的新型LaCo0.71（1）V0.29（1）O2.97（3）钙钛矿

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摘要

In the course of an investigation to prepare the hypothetic new double perovskite La3Co2VO9 with Co2+ and V5+ in octahedral sites, we obtained the new simple perovskite LaCo0.71(1)V0.29(1)O2.97(3) as the main phase. The pure compound was then synthesized by the citrate decomposition method. The crystal structure was studied by X-ray (PXRD) and powder neutron diffraction (PND). Physical properties were characterized by X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES) and thermogravimetric analysis (TGA). Rietveld refinements were performed in the orthorhombic space group Pnma (#62). Refined cell parameters were a = 5.4762(2)angstrom, b = 7.7609(2) angstrom and c = 5.5122(1) angstrom. Magnetization measurements showed that this perovskite is an antiferromagnet with a Neel temperature of 15 K. At high T the magnetization follows the Curie-Weiss law corrected by temperature independent paramagnetism (TIP) showing an effective magnetic moment of 3.03 mu(B) well described by the contribution of Co2+ (HS), Co3+ (IS), V3+ and V4+ ions. The crystallographic formula was refined by PND and oxidation state distribution was determined by the combination of PND, XAS, TGA and magnetic measurements.
机译：在研究过程中，在八面体位置制备假想的具有Co2 +和V5 +的新型双钙钛矿La3Co2VO9，我们获得了新的简单钙钛矿LaCo0.71（1）V0.29（1）O2.97（3）作为主要相。然后通过柠檬酸盐分解法合成纯化合物。通过X射线（PXRD）和粉末中子衍射（PND）研究晶体结构。物理性能通过X射线吸收光谱（XAS），X射线发射光谱（XES）和热重分析（TGA）进行表征。 Rietveld改进是在正交空间群Pnma（＃62）中进行的。精确的晶胞参数为a = 5.4762（2）埃，b = 7.7609（2）埃和c = 5.5122（1）埃。磁化强度测量结果表明，该钙钛矿是反铁磁体，其Neel温度为15K。在高T时，磁化强度遵循居里-魏斯定律，并由温度无关的顺磁性（TIP）校正，表明有效磁矩为3.0​​3μB。 Co2 +（HS），Co3 +（IS），V3 +和V4 +离子的贡献。通过PND细化晶体学公式，并通过PND，XAS，TGA和磁测量的组合确定氧化态分布。

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