以分析纯的Bi2O3,Nb2O5 和 SrCO3为原料,以KCl和NaCl为熔盐,采用熔盐法在800～1000 ℃合成了片状SrBi2Nb2O9粉体.研究了熔盐含量及合成温度对晶体定向生长和粉体形貌的影响.结果表明:与固相法相比,熔盐法是一种有效的晶粒定向生长的方法.制备的粉体呈明显的片状和高度的各向异性,且无团聚现象产生.沿(00l)面择优生长适合的熔盐含量为60%质量分数,随着熔盐含量的增加,晶粒尺寸逐渐增大.合成温度在900 ℃为最优,可获得较大尺寸和高度各向异性的SrBi2Nb2O9粉体.
Plate-like SrBi2Nb2O9 powders were prepared by molten salt synthesis process using Bi2O3,Nb2O5 and SrCO3 as source materials and KCl-NaCl as salt fluxes at 800-1000 ℃.The effects of the molten salt content as well as the synthesized temperature on the grain orientation growth and the morphology of the SrBi2Nb2O9 powders were investigated.The results present that the molten salt synthesis process is an effective way for the development of grain orientation compared with the conventional mixed oxides method,by which the powders appear to be plate-like with high degree anisotropy and without agglomerating.The optimum molten salt content for the preferential growth along(001)is 60 wt %.The grain size increases with the increase of molten salt content and the optimal temperature for obtaining larger size and higher degree anisotropy SrBi2Nb2O9 powders is about 900 ℃.
参考文献
| [1] | Scott J F;Arauzo C A .Ferroelectric Memories[J].Science,1989,246:1400-1405. |
| [2] | Arauzo C A;Cuchlaro J D;Mcmillan L D;Scott M C Scott J F .Fatigue-Free Ferroelectric Capacitors with Platinum Electrodes[J].NATURE,1995,374:627-629. |
| [3] | Newnham R E;Wolfe R W;Dorrian J F .Structural Basis of Ferroelectricity in the Bismuth Titanate Family[J].Materials Research Bulletin,1971,6:1029-1040. |
| [4] | Takenaka T;Sakata K .Grain Orientation and Electrical Properties of Hot-forged Bi4Ti3O12 Ceramics[J].Japanese Journal of Applied Physics,1980,19:31-39. |
| [5] | Yanmei K;Peiling W;Yongxiang L;Yibing C,Dongsheng Y .Fabrication of Textured Bismuth Titanate by Templated Grain Growth Using Aqueous Tape Casting[J].Journal of the European Ceramic Society,2003,23:2163-2169. |
| [6] | Zhao LL;Fan HQ;Zhang CS;Zhao M;Tian CS .Effect of excess PbO and sintering temperature on the templated grain growth of Pb(Mg1/3Nb2/3)(0.67)Ti0.33O3 polycrystals[J].Journal of Materials Science,2005(2):449-453. |
| [7] | YOSHIYUKI SAKUMA;TOSHIO KIMURA .Mechanisms of Texture Development in Bismuth Layer-Structured Ferroelectrics Prepared by Templated Grain Growth[J].Journal of electroceramics,2004(1/3):537-541. |
| [8] | Zhao L L;Feng G;Zhang C S;Zhao M,Tian C S .Molten Salt Synthesis of Anisometric KSrNb5O15 Particles[J].Journal of Crystal Growth,2005,276:446-452. |
| [9] | Yanmei Kan;Xihai Jin;Peiling Wang;Yongxiang Li;Yi-Bing Cheng;Dongsheng Yang .Anisotropic grain growth of Bi_4Ti_3O_(12) in molten salt fluxes[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2003(4):567-576. |
| [10] | G Liangzhai;D Jinhui;T Jintao;Z Zhibin,H Tian.Molten Salt Synthesis of ZnNb2O6 Powder[J].Materials Research Bulletin,2007 |
| [11] | H Tian;D Jinhui;T Jintao;Z Zhibin,G Liangzhai,L Zhongfang,Q Xiaofei,S Zhenlei,W Peipei.Synthesis of Bi0.5(Na0.7K0.2Li0.1)0.5TiO3 Powders Through the Molten Salt Method[J].Ceramics International,2007 |
| [12] | Yoon KH.;Kang DH.;Cho YS. .Molten salt synthesis of lead-based relaxors [Review][J].Journal of Materials Science,1998(12):2977-2984. |
| [13] | Cahn J W.On the Morphology Stability of Growth Crystals[A].Oxford,U K:Pergamon Press,1967:681-690. |
| [14] | 侯麦珍,杨留栓,黄金亮,殷镖,赵高磊,祝要民.熔盐法合成片状SrBi2Nb2O9粉体[J].硅酸盐学报,2006(06):652-655. |
| [15] | Akdogan E K;Brennan R E;Allahverdi M;Safari A .Effects of Molten Salt Synthesis(MSS)Parameters On the Morphology of Sr3Ti2O7 and SrTiO3 Seed Crystals[J].Journal of Electroceramics,2006,16:159-165. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%