金属学报  2006, Vol. 42 Issue (9): 974-978

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掺La对Pr0.75Na0.25MnO3的结构、磁性和电输运性质的影响

张兴华;李志青; 姜恩永

天津大学理学院应用物理系

INFLUENCE OF La DOPING ON THE STRUCTURE,MAGNETIC AND ELECTRICAL TRANSPORT PROPERTIES OF Pr0.75Na0.25MnO3

ZHANG Xinghua; LI Zhiqing; JIANG Enyong

天津大学理学院应用物理系

张兴华; 李志青; 姜恩永 . 掺La对Pr0.75Na0.25MnO3的结构、磁性和电输运性质的影响[J]. 金属学报, 2006, 42(9): 974-978 .
, , . INFLUENCE OF La DOPING ON THE STRUCTURE,MAGNETIC AND ELECTRICAL TRANSPORT PROPERTIES OF Pr0.75Na0.25MnO3[J]. Acta Metall Sin, 2006, 42(9): 974-978 .

摘要 参考文献 相关文章 Metrics 全文: PDF(190 KB)   摘要: 采用溶胶-凝胶法制备了(Pr1-xLax)0.75Na0.25MnO3(0.00≤x≤1.00) 系列多晶样品. X射线衍射结果表明, 所有样品均为单相类钙钛矿结构, 随着La3+离子含量的增加, 样品由x≤0.50时的正交结构转变为x≥0.70时的菱面体结构．磁性测量结果表明, La3+离子的掺入还导致了Pr0.75Na0.25MnO3电荷有序的破坏. 在x≤0.1时, 电荷有序转变温度随La3+离子含量增加而降低; 当x≥0.10时, 电荷有序现象消失, 样品出现顺磁-铁磁相变, 同时伴随着绝缘体--金属转变．磁熵变研究表明, x≥0.5的样品在室温附近和较低磁场下具有较大的磁熵变, 可望成为新的室温磁致冷材料. 关键词 ： 锰氧化物,  庞磁电阻,  电荷有序     Abstract：Polycrystalline (Pr 1-x La x)0.75Na0.25MnO3 (0.00≤x≤1.00) manganites were prepared by sol-gel method. X-ray Diffraction patterns showed that the samples are crystallized in single phase with perovskite-like structure. The structure of the compounds transforms from orthorhombic structure for x≤0.50 to rhombohedral structure for x≥0.70. The introduction of La3+ ions also suppresses the charge ordering in the samples. The charge ordering transition temperature decreases with increasing La3+ doping when x≤0.10. The charge ordering phenomenon disappeared for the samples with x＞0.10, paramagnetic-ferromagnetic transition appeared, while the insulator-metal transition can be observed. For x≥0.50, the compounds also show large magnetic entropy change under low field near or above room temperature, indicating the material can be used in magnetic refrigeration. Key words： manganite    colossal magnetoresistance    charge ordering 收稿日期: 2005-12-08      ZTFLH:  O482.5   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 张兴华 李志青 姜恩永 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2006/V42/I9/974 [1]Helmolt R V,Wecker J,Holzapfel B,Schultz L,Samwer K.Phys Rev Lett,1993;71:2331 [2]Jin S,Tiefel T H,McCormack M,Fastnacht R A,Ramesh R,Chen L H.Science,1994;264:413 [3]Wollan E O,Koehler W C.Phys Rev,1955;100:545 [4]Jirák Z,Krupi(?)ka S,(?)in(?)a Z,DlouáM,Vratislav S.J Magn Magn Mater,1985;53:153 [5]Uehara M,Mori S,Chen C H,Cheong S-W.Nature,1999;399:560 [6]F(?)th M,Freisem S,Menovsky A A,Tomioka Y,Aarts J,Mydosh J A.Science,1999;285:1540 [7]Guo Z B,Zhang J R,Huang H,Ding W P,Du Y W.Appl Phys Lett,1996;70:904 [8]Guo Z B,Du Y W,Zhu J S,Huang H,Ding W P,Feng D.Phys Rev Lett,1997;78:1142 [9]Bohigas X,Tejada J,del Barco E,Zhang X X,Sales M.Appl Phys Lett,1998;73:390 [10]Tomioka Y,Okuda T,Okimoto Y,Asamitsu A,Kuwahara H,Tokura Y.J Alloy Compd,2001;326:27 [11]Rao C N R,Arulraj A,Cheetham A K,Raveau B.J Phys:Condens Matter,2000;12:R83 [12]Hejtmanek J,Jirák Z,Sebek J,Strejc A,Hervieu M.J Appl Phys,2001;89:7413 [13]Li Z Q,Zhang X H,Liu H,Liu X J,Liu X D,Mi W B,Bai H L,Jing X N,Jiang E Y.Solid State Commun,2004;130:563 [14]Roy S,Guo Y Q,Venkatesh S,All N.J Phys:Condens Matter,2001;13:9547 [15]Zhong W,Chen W,Ding W P,Zhang N,Hu A,Du Y W,Yan Q J.J Magn Magn Mater,1999;195:112 [16]Zhong W,Chen W,Ding W P,Zhang N,Du Y W,Yan Q J.Solid State Commun,1998;106:55 [17]Li Z Q,Jiang E Y,Zhang D X,Hou D L,Li W C,Bai H L.Phys Lett,2000;277A:56 [18]Young R A,Sakthivel A,Moss T S,Paiva-Aantos C O.J Appl Cryst,1995;28:366 [19]Zhang X H,Li Z Q,Song W,Du X W,Wu P,Bai H L,Jiang E Y.Solid State Commun,2005;135:356 [20]Li Z Q,Zhang X H,Yu J S,Liu X J,Liu X D,Liu H,Wu P,Bai H L,Sun C Q.Lin J J,Jiang E Y.Phys Lett,2004;325A:430 [21]Rao G H,Sun J R,B(?)rner K,Hamad N.J Phys:Condens Matter,1999;11:1523 [22]Damay F,Martin C,Maignan A,Raveau B.J Appl Phys, 1997;82:6181 [23]Yu M H,Devi P S,Lewis L H,Sampath S,Parise J B, Gambino R J,Mater Sci Eng,2003;B97:245 [24]Phan M H,Tian S B,Yu S C,Ulyanov A N.J Magn Magn Mater,2003;256:306 [25]Ju H L,Gopalakrishnan J,Peng J L,Li Q,Xiong G C, Wenkatesan T,Greene R L.Phys Rev,1995;51B:6143 [26]Radaelli P G,Cox D E,Marezio M,Cheong S-W,Schiffer P E,Kamirez A P.Phys Rev Lett,1995;75:4488 [27]Phan M H,Peng H X,Yu S C,Tho N D,Chau N.J Magn Magn Mater,2005;285:199 [28]Sun Y,Tong W,Zhang Y H.J Magn Magn Mater,2001;232:205 [1] 刘新典; 姜恩永; 李养贤; 刘晖; 李文成; 米文博; 李志青 . Nd0.52Sr0.48MnO3多晶陶瓷的磁性和相分离[J]. 金属学报, 2003, 39(12): 1243-1246 . [2] 孔辉; 谢津桥; 张士龙; 苏金瑞; 朱长飞 . La1／3Sr2／3Mn1－xFexO3（x=0，0.05）中电荷有序现象的超声研究[J]. 金属学报, 2003, 39(11): 1183-1185 . [3] 马永青; 宋文海; 戴建明; 张瑞丽; 杨杰; 杜家驹; 孙玉平 . 钙钛矿结构锰氧化物La0.67Ca0.33MnO3的内耗研究[J]. 金属学报, 2003, 39(11): 1173-. [4] 唐奡男; 杨洋; 汪伟 . La1－xCaxMnO3（0．50≤x≤0．85）在电荷有序态下的合作Jahn－Teller效应与内耗关系研究[J]. 金属学报, 2003, 39(11): 1179-1182 . [5] 马永青; 宋文海; 戴建明; 张瑞丽; 杨杰; 杜家驹; 孙玉平 . 钙钛矿结构锰氧化物La0.67Ca0.33MnO3的内耗研究[J]. 金属学报, 2003, 39(11): 1173-1175 . Viewed Full text Abstract Cited   Shared      Discussed