论文标题
Batio中回收的铁电性的结构起源$ _3 $纳米颗粒
Structural Origin of Recovered Ferroelectricity in BaTiO$_3$ Nanoparticles
论文作者
论文摘要
据报道，纳米级BATIO3颗粒（约10 nm）通过磨球和七烷的混合物制备的纳米级颗粒的电化极化比散装batio3大几倍。在这项工作中，将详细的本地，中间和远程结构研究与光谱测量相结合，以开发这些材料的模型结构。 X射线光谱测量结果表明，大量的Ti偏心为产生纳米颗粒中较大自发极化的关键因素。与纯纳米颗粒系统相比，这些BATIO3纳米颗粒中结构相变的锐化晶格参数变化揭示了结构相变的锐化。钡片的拉曼光谱中的尖锐的结晶型峰表明，复合核心壳基质（机械化学合成的产物）中的该成分稳定了Batio3核心纳米颗粒的增强的极性结构相。
Nanoscale BaTiO3 particles (approximately 10 nm) prepared by ball-milling a mixture of oleic acid and heptane have been reported to have an electric polarization several times larger than that for bulk BaTiO3. In this work, detailed local, intermediate, and long-range structural studies are combined with spectroscopic measurements to develop a model structure of these materials. The X-ray spectroscopic measurements reveal large Ti off-centering as the key factor producing the large spontaneous polarization in the nanoparticles. Temperature-dependent lattice parameter changes reveal the sharpening of the structural phase transitions in these BaTiO3 nanoparticles compared to the pure nanoparticle systems. Sharp crystalline-type peaks in the barium oleate Raman spectra suggest that this component in the composite core-shell matrix, a product of mechanochemical synthesis, stabilizes an enhanced polar structural phase of the BaTiO3 core nanoparticles.
