通过溶胶-凝胶法制备了La1-xSrxCrO3纳米粉体并实现了低温致密烧结, 用X射线衍射仪、透射电镜、差示扫描量热分析仪和扫描电镜对粉体和烧结体进行分析. 结果表明: 粉体的平均直径<50nm, 当x=0, 0.1时, 粉体为单一的La1-xSrxCrO3, x=0.3时存在第二相SrCrO4. Sr掺杂使铬酸镧晶格产生畸变, 随Sr含量的增加, 晶格常数逐渐变小. 铬酸镧纳米粉体的烧结分为两个阶段, 1200℃以前的缓慢放热和1350℃左右的较快放热, 分别对应烧结的初期和中期. 依据DSC分析结果制订了烧结工艺, 并在1380℃烧结得到相对密度91％的铬酸镧烧结体.
La1-x SrxCrO3 powders were synthesized by a sol-gel method and sintered at a low temperature. The powders and sintered pellets were characterized by XRD, TEM, DSC and SEM. It is found that the mean particle size is below 50nm. The powder with x=0 and 0.1 of single phase of La1-x SrxCrO3, and another phase SrCrO4 appears with x=0.3. Lattice distorts and lattice parameters of lanthanum chromite decrease with increasing Sr content. The sintering process of lanthanum chromite can be divided into two stages: a slow exothermic effect below 1200℃ and a quick exothermic effect near 1350℃, corresponding to the primary and intermediate sintering stage, respectively. The relative density of the sintered body (x=0.3) after sintering at 1380℃ is 91％, according to the procedure derived from the DSC analysis.
参考文献
| [1] | Yang Y J, Wen T L, Tu H Y, et al. Solid State Ionics., 2000, 135 (1-4): 475--479. [2] Yokokawa H, Sakai N, Kawada T, et al. Journal of Electrochemical Society, 1991, 138 (4): 1018--1027. [3] Simner S, Hardy J, Stevenson J, et al. Journal of Materials Science, 1999, 34 (23): 5721--5732. [4] Mori M, Hiei Y, Sammes N M. Solid State Ionics, 1999, 123 (1): 103--111. [5] Mori M, Yamamoto T, Ichikawa T, et al. Solid State Ionics, 2002, 148 (1-2): 93--101. [6] Zheng W J, Pang W Q, Meng G Y, et al. Journal of Materials Chemistry, 1999, 9 (11): 2833--2836. [7] Rivas-Vazquez L P, Rendon-Angeles J C, Rodiguez-Galicia J L, et al. Solid State Ionics, 2004, 172 (1-4): 389--392. [8] Liu X M, Su W H, Lu Z, et al. Journal of Alloys and Compounds, 2000, 305 (1-2): 21--23. [9] Bilger S, Blass G, Forthmann R. Journal of the European Ceramic Society, 1997, 17 (8): 1027--1031. [10] Suda E, Pacaud B, Seguelong T, et al. Solid State Ionics, 2002, 151 (1-4): 335--341. [11] Peck D H, Miller M, Hilpert K. Solid State Ionics, 1999, 123 (1): 59--65. [12] 陈尚冰, 张璐, 戴向东, 等. 江汉石油学院学报, 1995, 17 (4): 61--64. [13] 魏智强, 温贤伦, 吴现成, 等. 兰州大学学报(自然科学版), 2003, 39 (5): 38--40. [14] 杨修春, Dubiel Manferd, Hofmeister Herbert, 等. 硅酸盐学报, 2006, 34 (1): 127--132. [15] 孟庆平, 戎咏华, 徐祖耀. 中国科学E辑, 2002, 32 (4): 457--464. [16] 朱勇. 科学通报, 1994, 39 (5): 169--470. [17] 李胜利, 张邦强, 凌子愚, 等. 金属热处理, 2005, 30 (9): 6--9. [18] 朱新德, 李胜利, 孙良成, 等. 金属热处理, 2004, 29 (12): 4--6. [19] 袁旭暄, 贾德昌, 周玉. 陶瓷科学与艺术, 2003, 37 (6): 48--50. |
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