以硝酸镧、硝酸锰和柠檬酸为原料,采用溶胶凝胶燃烧合成技术制备了超细LaMnO_3粉末.借助XRD、DTA、SEM、FT-IR等分析仪器研究了溶胶凝胶-燃烧合成技术合成超细LaMnO_3粉末的过程,着重讨论了前驱体溶液不同pH值对溶胶凝胶燃烧合成过程及合成产物的影响. 结果发现,采用溶胶凝胶燃烧合成技术能合成纳米晶的LaMnO_3粉末,随前驱体溶液pH值增加,燃烧反应速率增加,合成粉体的平均晶粒尺寸随pH值增加而减小. 通过控制前驱体溶液pH值能一步合成超细LaMnO_3颗粒(粒径＜200nm).
Nanocrystalline LaMnO_3 powder was synthesized by sol-gel combustion synthesis.The influence of pH value of the precursor solution on the combustion behavior and as-synthesized powder were investigated with the help of thermal analysis,infrared spectra,X-ray diffraction technique and scanning electron microscopy.The results showed that nanocrystalline LaMnO_3 powders can be synthesized by sol-gel combustion technique.The combustion rate increased with the pH value increasing.The crystallite size of the as-formed LaMnO_3 powder decreases with pH value increasing.LaMnO_3 powders with particle size less than 200nm can be obtained by control the pH value.
参考文献
| [1] | Huo G Y;Gu Z J;Liu S et al.[J].Journal of Alloys and Compounds,2007,433:41-47. |
| [2] | Das S;Poddar A;Roy B et al.[J].Journal of Alloys and Compounds,2004,365:94-98. |
| [3] | Helmolt R V;Wecker J;Samwer K .[J].Journal of Magnetism and Magnetic Materials,1993,71:2331-2337. |
| [4] | Moreno L C;Valencia J S;Landinez T .[J].Journal of Magnetism and Magnetic Materials,2008,320:19-25. |
| [5] | Vertruyen B;Flahaut D;Hebert S et al.[J].Journal of Magnetism and Magnetic Materials,2004,280:75-81. |
| [6] | Wang W;Jiang SP .A mechanistic study on the activation process of (La, Sr)MnO3 electrodes of solid oxide fuel cells[J].Solid state ionics,2006(15/16):1361-1369. |
| [7] | BULGAN G.,方滕飞,梁淑惠,姚文清,朱永法.Cu掺杂对LaMnO3催化剂的结构和催化氧化性能的影响[J].物理化学学报,2007(09):1387-1392. |
| [8] | Cimino S;Pirone R;Lisi L .[J].Applied Catalysis B:Environmental,2002,35:243-249. |
| [9] | 刘源;秦永宁 .[J].催化学报,1998,19(02):173-177. |
| [10] | Guido S;Francesco G;Giancarlo B .[J].Applied Catalysis B,1999,20:277-284. |
| [11] | Murrsy E P;Sever M J;Barnett S A .[J].Solid State Ionics,2002,148:27-35. |
| [12] | Xia CR.;Rauch W.;Chen FL.;Liu ML. .Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs[J].Solid state ionics,2002(1/2):11-19. |
| [13] | Rousseau F;Awamat S;Nikravech M et al.[J].Surface and Coatings Technology,2007,202:1 226-1 231. |
| [14] | Monterrubio B C;Ageorges H;Chartier T et al.[J].Surface and Coatings Technology,2006,200:3743-3750. |
| [15] | Aruna S T;Mutheraman M;Patil K C .[J].Materials Research Bulletin,2000,35:289-293. |
| [16] | Uskokovic V;Drofenik M .[J].Materials & Design,2007,28:667-671. |
| [17] | Bell RJ.;Drennan J.;Millar GJ. .Influence of synthesis route on the catalytic properties of La1-xSrxMnO3[J].Solid state ionics,2000(3/4):211-220. |
| [18] | Daturi M;Busca G;Groppi G et al.[J].Applied Catalysis B:Environmental,1997,12:325-331. |
| [19] | Hwang H J;Awano M .[J].Journal of the European Ceramic Society,2001,21:2103-2110. |
| [20] | Mali A;Ataie A .[J].Scripta Materialia,2005,53:1 065-1 072. |
| [21] | Yue Z X;Guo W Y;Zhou J et al.[J].Journal of Magnetism and Magnetic Materials,2004,270:216-223. |
| [22] | Qi X W;Zhou J;Yue Z X et al.[J].Material Science Communication,2002,78:25-32. |
| [23] | Ponce S. .Surface properties and catalytic performance in methane combustion of Sr-substituted lanthanum manganites[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2000(3/4):193-205. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%