Analysis of lattice vibration in fine particles of barium titanate single crystal including the lattice hydroxyl group
Analysis of lattice vibration in fine particles of barium titanate single crystal including the lattice hydroxyl group
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DOI：
10.1063/1.363508
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发表时间：
1996-11
影响因子：
3.2
通讯作者：
T. Noma;S. Wada;M. Yano;Takeyuki Suzuki
中科院分区：
文献类型：
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作者：
T. Noma;S. Wada;M. Yano;Takeyuki Suzuki
通过水热法制备平均粒径为约66 nm的钛酸钡单晶的细颗粒。在所制备的样品中，存在大量的羟基和钡空位，并且使用Rietveld方法将其晶体结构指定为具有扩展晶格的立方。随着煅烧温度的升高，羟基脱附，在200 ~ 300 °C范围内脱附明显。在700 °C以上，颗粒中没有羟基，并且使用Rietveld方法将在800 °C下处理的样品的晶体结构指定为具有1.001的四方性的四方晶系。通过红外反射法测量晶格振动的状态，并使用具有四参数半量子模型的非线性最小二乘法进行分析。结果，使用傅里叶变换红外和拉曼估计的所制备的样品的晶体结构被指定为四氢呋喃。在O 6八面体变形模式下，对变形的影响进行了分析。
Fine particles of barium titanate single crystal with an average particle size of about 66 nm were prepared by a hydrothermal method. In the as‐prepared sample, there was a large amount of the hydroxyl group and barium vacancy, and its crystal structure was assigned to cubic with an expanded lattice using a Rietveld method. The hydroxyl group desorbed with increasing calcination temperature, especially desorbing remarkably in the range from 200 to 300 °C. Above 700 °C, there was no hydroxyl group in the particle, and the crystal structure of the sample treated at 800 °C was assigned to tetragonal with tetragonality of 1.001 using a Rietveld method. The state of the lattice vibration was measured by an infrared reflection method, and analyzed using a nonlinear least‐squares method with a four‐parameter semiquantum model. As the result, the crystal structure of the as‐prepared sample estimated using Fourier transform infrared and Raman was assigned to tetragonal. On the O6 octahedra deformation mode, the re...