Synthesis of Nanometer-Sized Barium Titanate Crystallites Using a Modified Low Temperature Direct Synthesis Method and Their Characterization
Synthesis of Nanometer-Sized Barium Titanate Crystallites Using a Modified Low Temperature Direct Synthesis Method and Their Characterization
复制标题
改进的低温直接合成法合成纳米钛酸钡微晶及其表征
DOI：
10.2109/jcersj.108.1260_728
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发表时间：
2000
影响因子：
1.1
通讯作者：
T. Tsurumi
中科院分区：
文献类型：
--
作者：
S. Wada;H. Chikamori;T. Noma;Takeyuki Suzuki;T. Tsurumi
低温直接合成法（LTDS）可用于制备纳米钛酸钡微晶。然而，准确表征钛酸钡微晶中的杂质是困难的，因为碳酸钡作为副产物形成。在这项研究中，一个正常的LTDS方法进行了修改，以制备钛酸钡微晶在无CO2的气氛下，即，N2气氛。首次采用这种改进的LTDS方法制备了钛酸钡单相。在所制备的钛酸钡微晶的表征中，仅检测到羟基基团作为杂质。11质量%。对所制备的钛酸钡微晶的化学分析确定Ba/Ti原子比为0.635±0.005，这意味着在微晶中形成了大量的钡空位。XRD分析表明，钛酸钡的平均晶体结构为立方m3 m对称，而拉曼散射光谱分析表明，钛酸钡的局域结构为四方4 mm对称，表明钛酸钡晶体结构中存在无序体系。在各种温度下退火后，也表征了微晶。
A low temperature direct synthesis (LTDS) method is useful for preparing nm-sized barium titanate crystallites. However, the precise characterization of impurities in barium titanate crystallites is difficult because barium carbonate is formed as a by-product. In this study, a normal LTDS method was modified to prepare barium titanate crystallites under a CO2-free atmosphere, i.e., an N2 atmosphere. The barium titanate single phase was first prepared using this modified LTDS method. In the characterization of as-prepared barium titanate crystallites, only a hydroxyl group was detected as an impurity for ca. 11mass%. A chemical analysis of the as-prepared barium titanate crystallites determined that the Ba/Ti atomic ratio was 0.635±0.005, which means that a lot of barium vacancies formed in the crystallites. The average crystal structure, determined by XRD, was assigned to a cubic m3m symmetry, while the local structure, determined by Raman scattering spectroscopy, was assigned to a tetragonal 4mm symmetry, which suggested that in the crystal structure of as-prepared barium titanate crystallites, there existed a disorder system. Crystallites were also characterized after annealing at various temperatures.