采用溶胶-凝胶法(sol-gel)制备了名义组分为La0.60Sr0.40-Na工MnO3(x=0.00,0.10,0.15,0.20,0.30,0.33,0.35)的类钙钛矿型稀土锰氧化物多晶样品.发现用Na+替代部分Sr+2后,可使样品的居里温度降至室温附近,并且使样品的室温磁电阻比替代前明显增大.在1.8T的磁场作用下,样品La0.60 Sr0.07Na0.33MnO3在292K时磁电阻为24.4％,比不含Na的La0.60 Sr0.40MnO3增大了2.8倍；样品La0.60Sr0.25Na0.15MnO3在285K～345K温区内磁电阻保持在3.9％(±0.2％)左右,受温度影响不大,因此显著提高了样品的室温磁电阻和其温度稳定性.迄今为止还未见这类材料在室温附近具有如此宽范围和高温度上限的MR温度稳定性报道.这对于该类磁电阻材料的应用有很大意义.
参考文献
| [1] | Zener C .Interaction between the d-Shells in the Transition Metal.II.Ferromagnetic Compounds of Manganese with Perovskite Structure[J].Physical Review,1951,82:403-405. |
| [2] | A.J.Millis;P.B.Littlewoodd;B.I.Shraiman .Double Exchange Alone Does Not Explain the Resistivity of La1-x Srx MnO3[J].Physical Review Letters,1995,74:5144-5147. |
| [3] | X.M. Liu;G.D. Tang;X. Zhao .Influences of Cu-doped and Sr vacancy on the room manetoresistance of La_(0.67)Sr_(0.33-x-y)Cu_xMnO_3[J].Journal of Magnetism and Magnetic Materials,2004(1/2):118-122. |
| [4] | Hu JF.;Ji CJ.;Qin HW.;Chen J.;Hao YM.;Li YX. .Enhancement of room temperature magnetoresistance in La0.65Sr0.35Mn1-xTxO3 (T = Fe and Ni) manganites[J].Journal of Magnetism and Magnetic Materials,2002(2/3):271-275. |
| [5] | Md.A. Choudhury;S. Akhter;D.L. Minh .Large magnetic-entropy change above room temperature in the colossal magnetoresistance La_(0.7)Sr_(0.3)Mn_(1-x)Ni_xO_3 materials[J].Journal of Magnetism and Magnetic Materials,2004(2):1295-1297. |
| [6] | Takeuchi J.;Miyoshi K.;Fujiwara K.;Uemura A. .Colossal magnetoresistance and spin-glass behavior of the perovskite Nd0.67Sr0.33Mn1-xFexO3[J].Physica, B. Condensed Matter,2000(0):489-490. |
| [7] | Zhang N.;Zhong W.;Xing DY.;Du YW.;Ding WP. .TUNNEL-TYPE GIANT MAGNETORESISTANCE IN THE GRANULAR PEROVSKITE LA0.85SR0.15MNO3[J].Physical Review.B.Condensed Matter,1997(13):8138-8142. |
| [8] | Tao T.;Gu KM.;Xu HY.;Zhang SY.;Du YW.;Cao QQ. .Giant magnetoresistance of the La1-xAgxMnO3 polycrystalline inhomogeneous granular system[J].Applied physics letters,2000(5):723-725. |
| [9] | Z.Q. Li;X.H. Zhang;H. Liu;X.J. Liu;X.D. Liu;W.B. Mi;H.L. Bai;X.N. Jing;E.Y. Jiang .Magnetic properties of the charge ordered Nd_(0.75)Na_(0.25)MnO_3[J].Solid State Communications,2004(8):563-566. |
| [10] | XU Heng yi;CAO Qing qi et al.Magnetoresistanee in Room Temperature of Manganic Oxide La1-xNax MnO3[J].Journal of Functional Materials,2001,32:147-148. |
| [11] | Boudaya C.;Dhahri E.;Joubert JC.;Cheikh-Rouhou A.;Laroussi L. .Magnetic and magnetoresistance properties in rhombohedral (La1-xK+MnO3)-Mn-x perovskite-type compounds[J].Journal of Physics. Condensed Matter,1998(33):7485-7492. |
| [12] | 许恒毅,曹庆琪,沈亚涛,张世远.La1-xNaxMnO3室温巨磁电阻增强效应[J].磁性材料及器件,2000(03):1-5. |
| [13] | 陈永虔,谷坤明,唐涛,崔旭高,张世远.掺K+和Ag+的LaMnO3的室温庞磁电阻效应[J].磁性材料及器件,2001(03):9-13. |
| [14] | N. Abdelmoula;E. Dhahri;N. Fourati .Monovalent effects on structural, magnetic and magnetoresistance properties in doped manganite oxides[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2004(1/2):25-30. |
| [15] | 唐贵德,刘兴民,刘力虎,赵旭,白一鸣,潘成福,侯登录,余勇,禹日成,靳常青.La0.67Sr0.33-xAgxMnO3的室温磁电阻效应[J].功能材料,2004(04):434-436. |
| [16] | 张国庆,姜勇.择优掺杂的La-Ca-Na-Mn-O体系的庞磁电阻效应[J].中国稀土学报,2009(06):791-795. |
| [17] | 余江应,胡秀坤,夏洪旭,崔旭高,张世远.非正分钙钛矿锰氧化物（La0.8 Sr0.2）1-xMnO3的电磁特性[J].功能材料,2004(03):283-285. |
| [18] | W.Chen;W.Zhong;D.L.Hou;eta[ .effectofself-doped La0.8-x Na0.2 squarexMnO3 + delta (square =vacancies) polycrystal Preparation and magnetocaloric[J].Journal of Physics:Condensed Matter,2002,14:11889-11897. |
| [19] | Hwang H Y;Cheong S W;Radaelli P G et al.Lattice effects on the magnetoresistance in doped LaMnO3[J].Physical Review Letters,1995,75:914-917. |
| [20] | Fontcuberta J;Martinez B et al.Colossal magnetoresistance of ferromagnetic manganites:Structural tuning and mechanisms[J].Physical Review Letters,1996,6:1122-1125. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%