Use of Raman spectroscopy to determine the site occupancy of dopants in BaTiO3
Use of Raman spectroscopy to determine the site occupancy of dopants in BaTiO3
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DOI：
10.1063/1.3592192
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发表时间：
2011-06-01
影响因子：
3.2
通讯作者：
Reaney, I. M.
中科院分区：
文献类型：
--
作者：
Pokorny, J.;Pasha, U. M.;Reaney, I. M.
化学掺杂是改性BaTiO_3的主要方法之一，通过化学掺杂可以获得不同的器件特性。掺杂策略通常分为钙钛矿结构内的等价和异价（供体和受体）以及A位和B位物质。BaTiO_3中的A（1g）八面体呼吸模式在800 cm（-1）附近，对B位单一的组分没有拉曼活性。然而，如果存在多于一个B位物质，包括钛空位V-T“”，则该模式变为拉曼活性。此外，A（1g）呼吸模式的相对强度定性地与B位中取代Ti的物质的浓度有关。这篇文章说明了一些明确的情况下，A（1g）八面体呼吸模式可以用来验证掺杂剂在BaTiO 3中的占位时，结合更传统的间接方法，如X射线衍射（Vegard定律）和介电测量作为温度的函数。(C)2011年美国物理学会。[doi：10.1063/1.3592192]
Chemical doping is one of the major methods by which the properties of BaTiO3 are modified to induce various device characteristics. Doping strategies are generally separated into iso- and aliovalent (donors and acceptors) and into A-and B-site species within the perovskite structure. The A(1g) octahedral breathing mode at similar to 800 cm(-1) in BaTiO3 is Raman inactive for compositions with single B-site species. However, this mode becomes Raman active if more than one B-site species is present, including titanium vacancies, V-T''''. Moreover, the relative intensity of the A(1g) breathing mode is qualitatively related to the concentration of the species replacing Ti in the B-site. This article illustrates some clear cases where the A(1g) octahedral breathing mode can be utilized to verify the site occupancy of dopants in BaTiO3 when used in conjunction with more conventional indirect methods such as x-ray diffraction (Vegard's Law) and dielectric measurements as a function of temperature. (C) 2011 American Institute of Physics. [doi:10.1063/1.3592192]