全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

La0.7Ca0.3MnO3纳米颗粒的聚丙烯酰胺凝胶法制备及性能

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用聚丙烯酰胺凝胶法制备La0.7Ca0.3MnO3纳米颗粒。通过X射线衍射和扫描电镜研究不同pH值和不同络合剂对制备La0.7Ca0.3MnO3纳米颗粒形貌及性能的影响。结果表明合成La0.7Ca0.3MnO3钙钛矿相的最佳pH=2;分别以醋酸、草酸、柠檬酸和乙二胺四乙酸为络合剂,在600℃煅烧温度制备的高纯La0.7Ca0.3MnO3纳米颗粒的形貌规整、呈类球形,尺寸分布较窄,平均粒径分别为30、37、45、50nm;以酒石酸为络合剂,在900℃煅烧制备的单相La0.7Ca0.3MnO3颗粒的形貌不甚规整,颗粒间出现明显的煅烧粘连现象,颗粒尺寸较大,平均粒径为170nm。磁滞回线测量结果表明制得的La0.7Ca0.3MnO3颗粒在室温均表现为顺磁性,其顺磁磁化率随样品颗粒尺寸的减小而减小。

References

[1]  ? DONG R, WANG Q, CHEN L D, et al. Retention behavior of the electric- pulse-induced reversible resistance change effect in Ag-La0.7Ca0.3? MnO3-Pt sandwiches [J]. Appl Phys Lett, 2005, 86(17): 172107(1–3).
[2]  YANG Jun, YUN Yuehou, LI Guodong. Chin Rare Earths, 2010, 31(3): 67–70.
[3]  ? 付霞, 陈阳, 余高奇, 等. 超细钙钛矿型PrMnO3制备、表征及光催化[J]. 中国稀土学报, 2011, 29(1): 49–54.
[4]  FU Xia, CHEN Yang, YU Gaoqi, et al. J Chin Rare Earth Soc, 2011, 29(1): 49–54. ? ZENER C. Interaction between the d-shells in the transition metals.ⅡFerromagnetic compounds of manganese with perovskite structure [J]. Phys Rev, 1951, 82(3): 403–405.
[5]  ? 余晓满, 方军, 李仁文. La0.5M0.5MnO3 (M = Sr, Ba)的水热合成与表征[J]. 低温物理学报, 2009, 31(4): 291–296.
[6]  YU Xiaoman, FANG Jun, LI Renwen. Chin J Low Temp Phys, 2009, 31(4): 291–296.
[7]  ? 何伟, 羊新胜, 阚香, 等. 共沉淀法制备纳米多晶La2/3Sr1/3MnO3及其低场磁电阻性质[J]. 低温物理学报, 2008, 30(2): 167–170.
[8]  HE Wei, YANG Xinsheng, KAN Xiang, et al. Chin J Low Temp Phys, 2008, 30(2): 167–170.
[9]  ? 林生岭, 曹旭, 陈传祥, 等. 镧掺杂钙锰氧体/聚吡咯复合物的制备、表征及其电化学性能[J]. 复合材料学报, 2010, 27(3): 56–60.
[10]  LIN Shengling, CAO Xu, CHEN Chuanxiang, et al. Acta Mater Comp Sin, 2010, 27(3): 56–60.
[11]  ? 雷丽文, 傅正义, 张金咏, 等. 放电等离子煅烧La0.67Sr0.33MnO3–δ粉体的输运性质[J]. 硅酸盐学报, 2006, 34(2): 158–161.
[12]  LEI Liwen, FU Zhengyi, ZHANG Jinyong, et al. J Chin Ceram Soc, 2006, 34(2): 158–161.
[13]  ? VON HELMOLT R, WECKER J, HOLZAPFEL B, et al. Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic films [J]. Phys Rev Lett, 1993, 71(14): 2331–2333.
[14]  ? RAMIREZ A P. Colossal magnetoresistance [J]. J Phys Condens Matter, 1997(39), 9: 8171–8199.
[15]  ? 吴子华, 谢华清. La1–xCaxMnO3低温高磁场下的电脉冲诱导电阻转变效应[J]. 无机材料学报, 2010, 25(9): 961–965.
[16]  WU Zihua, XIE Huaqing. J Inorg Mater, 2010, 25(9): 961–965.
[17]  ? DEBNATH J C, ZENG R, KIM J H, et al. Giant magnetic entropy change in colossal magnetoresistance in La0.7Ca0.3MnO3 material in low field [J]. J Appl Phys, 2010, 107(9): 09A916(1–3).
[18]  ? 李爱君, 司海峰, 周战荣, 等. La0.77–xCa0.2SrxMnO3纳米颗粒的磁热效应[J]. 金属功能材料, 2008, 15(3): 25–28.
[19]  LI Aijun, SI Haifeng, ZHOU Zhanrong, et al. Metall Funct Mater, 2008, 15(3): 25–28.
[20]  ? SALVA H R, GHILARDUCCI A A, SáNCHEZ R D, et al. Magnetic held dependence of elastic modulus and resistance in La2/3Ca1/3MnO3 [J]. J Alloys Compd, 2000, 310(1/2): 44–46.
[21]  ? 杨军, 云月厚, 李国栋. 溶胶–凝胶法制备的LaxSr1–xMnO3纳米粉末微波吸收特性研究[J]. 稀土, 2010, 31(3): 67–70.
[22]  ? HWANG H Y, CHEONG S W, ONG N P, et al. Spin-polarized intergrain tunneling in La2/3Sr1/3MnO3 [J]. Phys Rev Lett, 1996, 77(10): 2041–2044.
[23]  ? 杨立芹, 羊新胜, 吕莉, 等. 复合相结构钙钛矿锰氧化物低场磁电阻效应[J]. 材料导报, 2010, 24(5): 11–15.
[24]  YANG Liqin, YANG Xinsheng, Lü Li, et al. Mater Rev, 2010, 24(5): 11–15.
[25]  ? 李阿丹. La2/3Ca1/3Mn1–xFexO3溶胶凝胶制备和表征[J]. 硅酸盐通报, 2007, 26(2): 401–403.
[26]  LI Adan. Bull Chin Ceram Soc, 2007, 26(2): 401–403.
[27]  ? 王仕发, 杨华, 县涛, 等. YMnO3纳米颗粒的制备与表征[J]. 硅酸盐学报, 2010, 38(12): 2303–2307.
[28]  WANG Shifa, YANG Hua, XIAN Tao, et al. J Chin Ceram Soc, 2010, 38(12): 2303–2307.
[29]  ? 县涛, 杨华, 戴剑锋, 等. 粒径可控的纳米铁酸铋的制备及其光催化性能[J]. 催化学报, 2011, 32(4): 618–623.
[30]  XIAN Tao, YANG Hua, DAI Jianfeng, et al. Chin J Catal, 2011, 32(4): 618–623.
[31]  ? 王伟鹏, 杨华, 县涛, 等. CoFe2O4纳米粉体的聚丙烯酰胺凝胶法合成、表征及磁特性[J]. 无机化学学报, 2011, 27(6): 1071–1076.
[32]  WANG Weipeng, YANG Hua, XIAN Tao, et al. Chin J Inorg Chem, 2011, 27(6): 1071–1076.
[33]  ? DOUY A, ODIER P. The polyacrylamide gel: a novel route to ceramic and glassy oxide powders [J]. Mater Res Bull, 1989, 24(9): 1119–1126.
[34]  ? SIN A, ODIER P. Gelation by acrylamide, a quasi-universal medium for the synthesis of fine oxide powders for electroceramic applications [J]. Adv Mater, 2000, 12(9): 649–652.
[35]  ? DEY P, NATH T K. Effect of grain size modulation on the magneto- and electronic-transport properties of La0.7Ca0.3MnO3 nanoparticles: The role of spin-polarized tunneling at the enhanced grain surface [J]. Phys Rev B, 2006, 73(21): 214425(1–14).
[36]  

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133