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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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镧掺杂钛酸钡粉体的水热改性
Abstract:
以固相法合成的BaTiO3粉体和La(NO3)3溶液为反应前驱物,NaOH为矿化剂,对BaTiO3粉体表面进行镧掺杂水热改性。利用X射线衍射仪、扫描电镜、Fourier红外光谱仪和透射电镜等研究了水热处理后BaTiO3粉体及陶瓷的相组成、晶粒尺寸、颗粒形貌及电性能。结果表明对不同镧掺杂浓度的BaTiO3粉体进行水热处理后,粉体粒径变小,粒度分布范围变窄,颗粒形貌变得圆整,实现了高温、高压条件下的水热"整形"作用。在BaTiO3粉体颗粒表层形成了一层约50nm厚的富镧层,实现了高温高压下对BaTiO3陶瓷粉体的改性。将改性后的BaTiO3粉体制成陶瓷,其室温电阻率测试结果表明,经水热处理后的粉体改善了镧在钛酸钡陶瓷中的掺杂均匀性,掺杂半导化浓度范围加宽。
| [1] | MOON J,SUVACI E,LI T,et al.Phase development of barium titanate from chemically modified amorphous titanium(hydrous)oxide pre-cursor[J].J Eur Ceram Soc,2002,22(6):809-815. [2]CHAISAN W,YIMNIRUN R,ANANTA S.Effect of vibro-milling time on phase formation and particle size of barium titanate nanopowders[J].Ceram Int,2009,35(1):173-176. [3]LIU Jingbing,WANG Hao,WANG Shu,et al.Hydrothermal prepara-tion of BiVO powders[J].Mater Sci Eng B,2003,104(1/2):36-39. [4]翟学良.水热法制备四方相BaTiO3及其晶相转化机理[J].硅酸盐学报,2000,28(4):357-359.ZHAI Xueliang.J Chin Ceram Soc(in Chinese),2000,28(4):357-359. [5]RICHARD E R,WOJCIECH L.Hydrothermal crystallization of ceramics[J].Chem Sci Mater,2002,27(6):15-36. [6]HOU R Z,FERREIR P,VILARNHO P M.A facile route for synthesis of mesoporous barium titanate crystallites[J].Microporous Mesopor-ous Mater,2008,110(2/3):392-396. [7]VOLTZKE D,GABLENZ S,ABICHT H-P,et al.Surface modification of barium titanate powder particles[J].Mater Chem Phys,1998,2(61):110-116. [8]蒲永平,陈寿田.水热法合成四方相超细BaTiO3粉体的研究进展[J].材料导报,2003,17(11):44-46.PU Yongping,CHEN Shoutian.Mater Rev(in Chinese),2003,17(11):44-46. [9]ABICHT H-P,VOLTZKE D,SCHNEDER R,et al.Defect chemistry of the shell region of water-milled BaTiO3powders[J].Mater Chem Phys,1998,4(55):188-192. [10]仲维卓,华素坤.晶体生长形态学[M].北京:科学出版社,1999:331-333.ZHONG Weizhuo,HUA Sukun.Crystal Growth Morphology(in Chi-nese).Beijing:Science Press,1999:331-333. [11]王智民,韩基新,刘静波.掺镧改性钛酸钡纳米多晶粉体的制备和表征[J].无机材料学报,2002,17(5):945-952.WANG Zhimin,HAN Jixin,LIU Jingbo.J Inorg Mater(in Chinese),2002,17(5):945-952. [12]QI Jianquan,GUI Zhilun,WANG Yongli,et al.The PTCR effect in BaTiO3ceramics modified by donor dopant[J].Ceram Int,2002,28(2):141-143. [13]蒲永平,陈寿田,LANGHAMMER H T,等.Ba1-xLaxTiO3陶瓷的晶界再氧化机理研究[J].无机材料学报,2006,21(4):919-926.PU Yongping,CHEN Shoutian,LANGHAMMER H T,et al.J Inorg Mater(in Chinese),2006,21(4):919-926. [14]NOWOTNY J,REKAS M.Defect chemistry of BaTiO3[J].Solid State Ionics,1991,49(1):135-154. [15]CASTRO M S,SALGUEIRO W,SOMOZA A.Electron paramagnetic resonance and positron annihilation study of the compensation mecha-nisms in donor-doped BaTiO3ceramics[J].J Phys Chem Solids,2007,68(7):1315-1323. [16]THEO L H,DARKO M,PU Yongping.Grain boundary reoxidation of donor-doped barium titanate ceramics[J].J Eur Ceram Soc,2006,26(14):2899-2907.
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