硅酸盐学报

纳米晶钛酸钡粉体的相结构

作者：张辉王晓慧郝亚楠沈正波李龙土

关键词：纳米晶钛酸钡粉体制备微结构尺寸效应

分类号：TQ 174.1

出版年,卷(期):页码：2014,42(2):216-219

DOI：10.7521/j.issn.0454－5648.2014.02.13

摘要：

采用溶剂热法一步合成了3～5nm单分散纳米晶钛酸钡(BaTiO₃)粉体，利用原位变温Raman光谱研究了纳米晶BaTiO₃粉体的微区结构特性。结果表明：纳米晶BaTiO₃相变区间弥散，呈现多相共存的结构特性；即使晶粒尺寸小到5nm，仍然具有与大晶粒BaTiO₃陶瓷类似的行为，即随温度升高经历从三方相→正交相→四方相→立方相的连续相变。

Nanocrystalline bariumtitanate (BaTiO₃) powders with the grain size of 3－5nm were prepared by an one－step solvothermal method.The analysis by in－situ heating Raman spectroscopy revealed the dispersive phase transition character in the nanocrystalline BaTiO₃powders.The BaTiO₃powders with the nanograin of 5nm exhibit the similar phase transformations from rhombohedral to orthorhombic, then to tetragonal, and finally to cubic as those in the coarse BaTiO₃ceramics.

基金项目：

国家973计划项目（2009CB623301），国家自然科学基金创新团体(51221291)，国家自然科学基金杰出青年学者(50625204)国家自然科学基金(51272123)。

作者简介：

第一作者：张辉（1971—），女，博士，高级工程师。通信作者：王晓慧（1965—），女，博士，教授。

参考文献：

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[1]　SHAW M T, MCKINSTRY S T, MCINTYRE P C.The properties of ferroelectric films at small dimensions [J].Annu Rev Mater Sci, 2000, 30(1): 263－298.
[2]　ALRT G, HENNINGS D, WITH G D.Dielectric properties of fine－grained barium titanate ceramics [J].J Appl Phys, 1985, 58(4): 1619－1625.
[3]　FREY M H, PAYNE D A.Grain－size effect on structure and phase transformations for barium titanate [J].Phys Rev, 1996, 54(5): 3158－3168.
[4]　DU H, WOHLRAB S, WEI M, et al.Preparation of BaTiO3 nanocrystals using a two－phase solvothermal method [J].J Mater Chem, 2007, 17(6): 4605－4610.
[5]　BUESSEM W R, CROSS L E, GOSWAMI A K.Phenomenological theory of high permittivity in fine－grained barium titanate [J].J Am Ceram Soc, 1966, 49 (1): 33－36.
[6]　SAAD M M, BAXTER P, BOWMAN R M, et al.Intrinsic dielectric response in ferroelectric nano－capacitors [J].Phys Condens Mater, 2004, 16: L451.
[7]　UCHINO K, SADANAGA E, HIROSE T.Dependence of the crystal structure on particle size in barium titanate [J].J Am Ceram Soc, 1989, 72(8): 1555－1558.
[8]　ZHANG H, WANG X H, TIAN Z H, et al.Fabrication of mono dispersed 5－nm BaTiO3 nanocrystals with narrow size distribution via one－step solvothermal route [J].J Am Ceram Soc, 2011, 94(10): 3220－3222.
[9]　O′BRIEN S, BRUS L, MURRAY C B.Synthesis and characterization of nanocrystals of barium titanate, toward a generalized synthesis of oxide nanoparticles [J].J Am Chem Soc, 2001, 123(48), 12085－12086.
[10]　NiEDERBERGER M, PINNA N, POLLEUX J, et al.A general soft chemistry route to perovskites and related materials: synthesis of BaTiO3, BaZrO3 and LiNbO3 nano particles [J].Angew Chem Int Ed, 2004, 43(17), 2270－2273.
[11]　NIEDERBERGER M, GARNWEITNER G, PINNA N, et al.Nonaqueous and hilide－free route to crystalline BaTiO3, SrTiO3, and (Ba，Sr)TiO3 nano particles via a mechanism involving C—C bond formation [J].J Am Chem Soc, 2004, 126(29): 9120－9126.
[12]　WANG X, ZHUANG J, PENG Q, et al.A general strategy for nano crystal synthesis [J].Nature, 2005, 437: 121－124.
[13]　DENG X, WANG X H, WEN H, et al.Phase transition of nano grain barium titanate ceramics by spar kplasma sintering [J].J Am Ceram Soc, 2006, 89(3): 1059－1064.
[14]　肖长江，靳常青，王晓慧.纳米钛酸钡陶瓷的晶体结构[J].功能材料，2007, 10 (38): 1621－1623.
XIAO Changjiang, JIN Changqing, WANG Xiaohui.J Funct Mater(in Chinese), 2007, 10 (38): 1621－1623.
[15]　邓湘云，王晓慧，李龙土.纳米晶钛酸钡陶瓷尺寸效应的研究[J].稀有金属材料与工程，2008, 37(1): 810－812.
DENG Xiangyun, WANG Xiaohui, LI Longtu.Rare Met Mate rEng(in Chinese), 2008, 37(1): 810－812.

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