Effect of Ag doping on structural, magnetic and magnetocaloric properties of La0.65Ca0.35−xAgxMnO3 manganites
作者： M. Koubaa , W. Cheikhrouhou-Koubaa , A. Cheikhrouhou
DOI: 10.1016/J.JALLCOM.2008.05.089
关键词:
摘要: Abstract In the present study we report effect of Ag doping on structural, magnetic and magnetocaloric properties in La0.65Ca0.35−xAgxMnO3 powder samples synthesized using solid-state reaction method at high temperature. Powder X-ray patterns have been analyzed by Rietveld method. With increasing amount, a structural transition from orthorhombic (Pbnm space group) to rhombohedral system ( R 3 ¯ c for x > 0.1 has observed. Magnetization measurements versus temperature applied field 50 mT showed that all our investigated display paramagnetic–ferromagnetic with decreasing The Curie TC increases amount 248 K x = 0–278 K x = 0.2. entropy change, deduced magnetization up 7 T several temperatures exhibits maximum |ΔSm|max which decreases content. is found decrease 1.65 J/kg K x = 0.05–0.89 J/kg K x = 0.2 upon change 1 T while relative cooling power RCP remains almost constant doped samples.
elsevier.com
sci-hub.se 参考文章(30)
T. Tang, Q. Q. Cao, K. M. Gu, H. Y. Xu, S. Y. Zhang, Y. W. Du, Giant magnetoresistance of the La1−xAgxMnO3 polycrystalline inhomogeneous granular system Applied Physics Letters. ,vol. 77, pp. 723- 725 ,(2000) , 10.1063/1.127098
Manh-Huong Phan, Seong-Cho Yu, Nam Hwi Hur, Yoon-Hee Jeong, Large magnetocaloric effect in a La0.7Ca0.3MnO3 single crystal Journal of Applied Physics. ,vol. 96, pp. 1154- 1158 ,(2004) , 10.1063/1.1762710
H. Wada, Y. Tanabe, Giant magnetocaloric effect of MnAs1−xSbx Applied Physics Letters. ,vol. 79, pp. 3302- 3304 ,(2001) , 10.1063/1.1419048
Xiao-Bo Yuan, Yi-Hua Liu, Cheng-Jian Wang, Liang-Mo Mei, Electrical properties and room temperature magnetoresistance of La0.67(Ca0.65Ba0.35)0.33MnO3/Agx composites Journal of Physics D. ,vol. 38, pp. 3360- 3365 ,(2005) , 10.1088/0022-3727/38/18/005
Manh-Huong Phan, Seong-Cho Yu, Nam Hwi Hur, Excellent magnetocaloric properties of La0.7Ca0.3−xSrxMnO3(0.05⩽x⩽0.25) single crystals Applied Physics Letters. ,vol. 86, pp. 072504- ,(2005) , 10.1063/1.1867564
A. N. Ulyanov, Y. M. Kang, S. I. Yoo, Metamagnetic transition and extremely large low field magnetocaloric effect in La0.7Ca0.3MnO3 manganite Journal of Applied Physics. ,vol. 103, ,(2008) , 10.1063/1.2834704
Sudipta Pal, Aritra Banerjee, S. Chatterjee, A. K. Nigam, B. K. Chaudhuri, H. D. Yang, Transport and magnetic properties of La0.7Pb0.3MnO3+x Ag (x=0−20 wt %) nanocomposites Journal of Applied Physics. ,vol. 94, pp. 3485- 3491 ,(2003) , 10.1063/1.1597761
A N Ulyanov, J S Kim, G M Shin, Y M Kang, S I Yoo, Giant magnetic entropy change in La0.7Ca0.3MnO3 in low magnetic field Journal of Physics D. ,vol. 40, pp. 123- 126 ,(2007) , 10.1088/0022-3727/40/1/002
Xiao-Bo Yuan, Yi-Hua Liu, Na Yin, Cheng-Jian Wang, Liang-Mo Mei, Effects of Ag addition on electrical transport and magnetic properties of La0.67Ba0.33Mn0.88Cr0.12O3 Journal of Magnetism and Magnetic Materials. ,vol. 306, pp. 167- 171 ,(2006) , 10.1016/J.JMMM.2006.02.238
I K Kamilov, A G Gamzatov, A M Aliev, A B Batdalov, A A Aliverdiev, Sh B Abdulvagidov, O V Melnikov, O Yu Gorbenko, A R Kaul, Magnetocaloric effect in La1−xAgyMnO3 (y ⩽ x): direct and indirect measurements Journal of Physics D. ,vol. 40, pp. 4413- 4417 ,(2007) , 10.1088/0022-3727/40/15/004