用固相反應(yīng)法制備（1-x）La_8/9Sr_1/45Na_4/45MnO₃/x（Cr₂O₃）（x=0,0.05,0.10,0.20）系列樣品。通過X射線衍射（XRD）圖譜、掃描電子顯微鏡（SEM）照片,探究晶體結(jié)構(gòu);通過零場(chǎng)和加場(chǎng)（B=0.8 T）的電阻率-溫度（ρ-T）曲線,研究電輸運(yùn)性質(zhì);并作出磁電阻-溫度（MR-T）曲線,研究磁電阻行為。結(jié)果表明:樣品是鈣鈦礦氧化物與Cr₂O₃二相復(fù)合體,復(fù)合樣品的電輸運(yùn)性質(zhì)與母體截然不同,在整個(gè)測(cè)試溫區(qū)表現(xiàn)為絕緣體導(dǎo)電行為,因?yàn)镃r₂O₃是絕緣體,它包覆在鈣鈦礦顆粒表面形成厚厚的勢(shì)壘層,自旋電子難以穿越;復(fù)合樣品在室溫附近很寬泛溫區(qū)磁電阻大大增強(qiáng),x=0.10的樣品,在172³20 K溫區(qū)MR>14.3%,x=0.20的樣品,在250³20 K溫區(qū)MR>15%。在室溫附近如此寬泛... 

【文章來源】：稀有金屬. 2017,41(06)北大核心EICSCD

【文章頁(yè)數(shù)】：6 頁(yè)

【文章目錄】：
1實(shí)驗(yàn)
2結(jié)果與討論
    2.1結(jié)構(gòu)
    2.2電輸運(yùn)性質(zhì)
    2.3磁電阻效應(yīng)
3結(jié)語(yǔ)


【參考文獻(xiàn)】：
期刊論文
[1]鍶摻雜鑭錳氧化物的結(jié)構(gòu)及其紅外發(fā)射率[J]. 申星梅,程國(guó)慶,宋路路,李遼沙,武杏榮,朱建華.  硅酸鹽學(xué)報(bào). 2016(09)
[2]La0.67Ca0.33-xBaxMnO3的電輸運(yùn)性質(zhì)反常及磁電阻溫度穩(wěn)定性[J]. 李莉,王桂英,羅鵬,彭振生.  稀有金屬. 2016(05)
[3]Pr0.4Ca0.6Mn1-xCrxO3的磁性質(zhì)及電荷有序相[J]. 劉鵬,王桂英,毛強(qiáng),李莉,葉吾梅,彭振生.  稀土. 2015(02)
[4]Co替代Mn的La0.4Ca0.6Mn1-xCoxO3的磁電性質(zhì)及電荷有序相[J]. 王桂英,劉鵬,李莉,葉吾梅,劉寧,彭振生.  稀有金屬. 2015(05)
[5]二相復(fù)合體La2/3Ca1/3MnO3/xCuO的界面效應(yīng)[J]. 李莉,王桂英,唐永剛,劉鵬,葉吾梅,彭振生.  稀有金屬. 2015(06)
[6]Electric transport properties and temperature stability of magnetoresistance of composite system between La8/9Sr1/45Na4/45MnO3 and Sb2O3[J]. Gui-Ying Wang,Yong-Gang Tang,Qi-Xiang Song,Ming-Yu Zhang,Zhen-Sheng Peng.  Rare Metals. 2013(04)
[7]Magnetoresistance enhancement and temperature stability of magnetoresistance in La1-x(Sr1-yNay)xMnO3[J]. WANG Guiying a,b,YAN Guoqing a,b,YANG Jie a,b,WANG Wenqi a,b,TANG Yonggang a,b,SONG Qixiang a,b,ZHANG Mingyu a,b,and PENG Zhensheng a,c a Anhui Key Laboratory of Spintronic and Nanometric Materials(Cultivating Base),Suzhou 234000,China;b School of Mechanical and Electronic Engineering,Suzhou University,Suzhou 234000,China;c Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China.  Rare Metals. 2012(04)
[8](1-x)La0.6Dy0.1Sr0.3MnO3/0.5x（Sb2O3）復(fù)合體系的電輸運(yùn)性質(zhì)及低場(chǎng)磁電阻效應(yīng)[J]. 楊杰,唐永剛,王桂英,蔡之讓,彭振生.  稀有金屬. 2011(06)
[9]Enhancement of room-temperature magnetoresistance in La0.6Dy0.1Sr0.3MnO3/Agx[J]. SONG Qixianga, NIU Xiaofeia, WANG Guiyinga, TANG Yongganga, CAI Zhiranga, and PENG Zhenshenga, b a Anhui Key Laboratory of Spintronic and Nanometric Materials(Cultivating Base), Suzhou College, Suzhou 234000, China b Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China.  Rare Metals. 2010(02)
[10]Ag摻雜對(duì)La0.7Ca0.2Sr0.1MnO3室溫磁電阻效應(yīng)的增強(qiáng)[J]. 張炯,魏立國(guó),張蕾,李定國(guó),熊永紅,熊曹水.  低溫物理學(xué)報(bào). 2007(02)



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