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Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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多铁基BaTiO3-CoFe2O4纳米结构的纳米结构

H Zheng¹, J Wang, S E Lofland

¹Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.

Science (New York, N.Y.)

|January 31, 2004

概括

我们在BaTiO3-CoFe2O4纳米结构中展示了铁电和磁性之间的合. 这种合使得传感器和传感器等先进设备的能量相互转换成为可能.

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科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
纳米技术纳米技术

背景情况:

铁电和磁性合对于先进的电子设备至关重要.
纳米结构材料为能量互转换提供了独特的特性.

研究的目的:

在BaTiO3-CoFe2O4纳米结构中研究铁电和磁性顺序参数之间的合.
探索这些材料在传感器和场传感器中的应用潜力.

主要方法:

在SrTiO3 (001) 基板上脉冲激光沉积BaTiO3-CoFe2O4薄膜.
表皮增长和自组装的纳米柱状结构的表征.
取决于温度的磁性测量,以分析顺序参数合.

主要成果:

嵌入CoFe2O4纳米柱 (20-30纳米) 的BaTiO3-CoFe2O4薄膜的表轴生长.
观察铁电和磁顺序参数之间的合.
在铁电库里温度下磁化变化表明强.

结论:

纳米结构的铁电磁体表现出显著的磁电合.
BaTiO3和CoFe2O4相之间的弹性相互作用是观察到的合的关键.
这些发现为使用合铁电和磁性质的新型设备应用铺平了道路.