Morphology evolution and physical properties of Bi₂Mn₄O₁₀ synthesized by hydrothermal method

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• 作者：Wenjuan Zhang ; Jun Chen ; You Wang ; Longlong Fan ; Jinxia Deng ; Ranbo Yu ; Xianran Xing
• 关键词：A1. Magnetic fields ; A1. X-ray diffraction ; A2. Hydrothermal crystal growth ; B1. Bismuth compounds
• 刊名：Journal of Crystal Growth
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：380
• 期：Complete
• 页码：1-4
• 全文大小：1175 K

文摘

Bi₂Mn₄O₁₀ powder samples with controllable morphologies were prepared by a simple one-step hydrothermal route. By changing the species and concentration of mineralizer, various morphologies were obtained, such as shuttle-like, lump-like, sheet-like, and donut-like particles. The resulting products were characterized by X-ray powder diffraction, scanning electron microscope, magnetic and dielectric measurement. The morphology of Bi₂Mn₄O₁₀ powder is affected by various factors such as holding temperature, species and concentration of mineralizer. The lowest holding temperature for synthesis of pure phase of Bi₂Mn₄O₁₀ is 220 ¡ãC. When the concentration of KOH increases from 2 mol/L to 8 mol/L, the particles evolve from shuttle-like to lump-like. Changing the mineralizer from KOH to NaOH, sheet-like particles were obtained. Magnetic measurements reveal that Bi₂Mn₄O₁₀ shows paramagnetic nature at room temperature and weak ferromagnetic property at low temperature.