采用化学共沉淀法制备了La2/3A1/3MnO3:Agx (A=Ca、Sr、Ba,LAMO:Agx,x=0、0.1、0.2、0.3、0.4 mol%)多晶复合材料.XRD结果表明实验制备了纯相LAMO:Agx样品,Ag+离子A位替代致使LCaMO:Agx和LSrMO:Agx晶格常数和晶胞体积发生微小膨胀,LBaMO:Agx晶格常数和晶胞体积发生微小收缩;R-T测试结果表明LCaMO:Agx的电阻温度系数(Temperature Coefficient of Resistance,TCR)数值在x=0.4、Tk=271.3 K(Tk为TCR位于最大值时对应的温度数值)时具有最大值为28%/K.SEM分析结果表明,随着Ag掺杂量增加,LCaMO晶粒尺寸增大,晶粒均匀性和规则性得以改善,晶化质量得到提高.通过Ag微观掺杂机制对LAMO复合材料的TCR数值增强进行了分析讨论.
参考文献
[1] | Helmolt R V,Wecker J,Holzapfel B,et al.Giant negative magnetore-sistance inperovskitelike La2/3Ba1/3MnOx ferromagnetic films.Phys.Rev.Lett.,1993,71(14):2331-2333. |
[2] | Siwach P K,Goutam U K,Srivastava P,et al.Colossal magnetoresistance study in nanophasic La0.7Ca0.3MnO3 manganite.J.Phys.D:Appl.Phys.,2006,39(1):14-20. |
[3] | Fontcuberta J,Martinez B,Seffar A,et al.Colossal magnetoresistance of feromagnetic manganites:structural tuning and mechanism.Phys.Rev.Lett.,1996,76(7):1122-1125. |
[4] | Zhang P,Zhu S,Liu X,et al.Effect thermal annealing on structural,electrical and magnetic properties on Ag-doped La0.67Ca0.33MnO3thin films grown on LaAlO3 substrates.Jpn.J.Appl.Phys.,2006,45(2A):726-729. |
[5] | Habermeier H,Li X H,Zhang P X,et al.Anisotropy of thermoelectric properties in La2/3Ca1/3MnO3 thin films studied by laser-induced transient voltages.SolidState Commun.,1999,110(9):473-478. |
[6] | Li X H,Habermeier H,Zhang P X J.Laser-induced off-diagonal thermoelectric voltage in La1-xCaxMnO3 thin films.J.Magn.Magn.Mater.,2000,211(1/2/3):232-237. |
[7] | Zhang P X,Habermeier H.Atomic layer thermopile materials physics and application.Journal of Nanomaterials,2008(5):329601-329612. |
[8] | Zhang P X,Wang C,Tan S L,et al.Improving the performance of thermoelectric devices by doping Ag in LaPbMnO3 thin films.J.Cryst.Growth,2008,310(11):2732-2737. |
[9] | Zhang P,Wang C,Zhang G Y,et al.LaCaMnO3 thin film laser energy/power meter.Optics & Laser Technology,2004,36(4):341-343. |
[10] | Zhao K,He M,Lv H B.Reversal transient laser-induced voltage in La2/3Ca1/3MnO3 films.Chinese.Phys.,2007,16(3):0840-0842. |
[11] | Zhang G Y,Zheng H R,Zhang X Y,et al.Time-integral type strongly correlated electronic thin-film laser energy mete.Applied Physics B:Lasers and Optics,2012,108(3):649-655. |
[12] | Awana V P S,Tripathi R,Balamurugan S,et al.Magneto transport of high TCR (temperature coefficient of resistance) La2/3Ca1/3MnO3:Ag polycrystalline composites.Solid State Commun.,2006,140(9/10):410-415. |
[13] | Awana V P S,Tripathi R,Kumar N,et al.Magnetotransport of La0.70Ca03-xSrxMnO3(Ag):a potential room temperature bolometer and magnetic sensor.J.Appl.Phys.,2010,107(9):09D7231-1 3. |
[14] | Tripathi R,Awana V P S,Kishan H,et al.Search for room temperature high-TCR manganite/silver composites.J.Magn.Magn.Mater,2008,320(10):L89-L92. |
[15] | Todd M A,Donohue P P,Wright P J,et al.Colossal magnetoresistive manganite thin-films for infrared detection and imaging.Ann.Phys-berlin.,2004,13(12):48-51. |
[16] | Sukhorukov Y P,Telegin A V,Granovskii A B,et al.Magnetorefractive effect in La07Ca0.3MnO3 in the infrared spectral range.J.Exp.Theor Phys.,2010,111(3):355-362. |
[17] | Mansuri I,Varshney D,Kaurav N,et al.Effects of A-site disorder on magnetic,electrical and thermal properties of La0.5-xLnxCa0.5-ySryMnO3 manganites.J.Magn.Magn.Mater,2011,323(3/4):316-323. |
[18] | Venkataiah G,Huang J C P.Low temperature resistivity minimum and its correlation with magnetoresistance in La0.67Ba033MnO3nanomanganites.J.Magn.Magn.Mater,2010,322(4):417-423. |
[19] | Nagabhushana B,Sreekanthchakradhar R,Ramesh K,et al.Magnetoresistance studies on barium doped nanocrystalline manganite.J.Alloys Compd.,2008,450(1/2):364-368. |
[20] | Kumar R,Gupta A,Singh D,et al.Current-induced effect on resistivity and magnetoresistance of La0.67Ba0.33MnO3 manganite.J.Magn.Magn.Mater,2008,320(21):2741-2745. |
[21] | Chahara K I,Ohno T,Kasai M,et al.Magnetoresistance in magnetic manganese oxide with intrinsic antiferromagnetic spin structure.Appl.Phys.Lett.,1993,63(14):1990-1992. |
[22] | Gupta A,Sun J Z.Spin-polarized transport and magnetoresistance in magnetic oxides.J.Magn.Magn.Mater.,1999,200(1):24-43. |
[23] | Tripathi R,Awana V P S,Kishan H,et al.Impact of silver addition on room temperature magneto-resistance in La0.7Ba03MnO3(LBMO) Agx (x=0.0,0.1,0.2,0.3,0.4).Journal of Superconductivity and Novel Magnetism,2008,21(2):151-159. |
[24] | Huang Y,Huang K,Luo F,et al.Enhanced ferromagnetic transition and magnetoresistance in granular Ag-added La0.7Ca0.3MnO3.J.SolidState Chem.,2003,174(2):257-263. |
[25] | Yadav R,Anshul A,Shelke V.Wide range magnetoresistance and high temperature coefficient of resistance in La0.7Sr0.3-xAgxMnO3system.J.Mater Sci:Mater Electron.,2011,22(8):1173-1180. |
[26] | Urushibara A,Arima T,Asamitsu A,et al.Insulator-metal transition and giant magnetoresistance in La1-xSrxMnO3.Phys.Rev.B,1995,51(20):14103 14109. |
[27] | Gross R,Alff L,Büchner B,et al.Physics of grain boundaries in the colossal magnetoresistance manganites.J.Magn.Magn.Mater,2000,211(1/2/3):150-159. |
[28] | Shreekala R,Rajeswari M,Pai S P,et al.Improved properties of La0.67Ca0 33MnO3 thin films by addition of silver.Appl.Phys.Lett.,1999,74(19):2857-2859. |
[29] | Kumar N,Kishan H,Rao A,et al.Structural electrical magnetic and thermal studies of Cr-doped La0.7Ca0.3Mn1-xCrxO3 (0≤x≤ 1)manganites.J.Appl.Phys.,2010,107(8):083905-083910. |
[30] | Phong P T,Khiem N V,Dai N V,et al.Low-field magnetoresistance of (1-x)La07Ca03MnO3+xAg composites.J.Alloys Compd.,2009,484(1/2):12-16. |
[31] | Siwach P K,Prasad R,Gaur A,et al.Microstructure-magnetotransport correlation in La07Ca0.3MnO3.J.Alloys Compd.,2007,443(1/2):26-31. |
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%