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　　用固相反應法制備（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,探究晶體結構;通過零場和加場（B=0.8 T）的電阻率-溫度（ρ-T）曲線,研究電輸運性質;并作出磁電阻-溫度（MR-T）曲線,研究磁電阻行為。結果表明:樣品是鈣鈦礦氧化物與Cr₂O₃二相復合體,復合樣品的電輸運性質與母體截然不同,在整個測試溫區(qū)表現(xiàn)為絕緣體導電行為,因為Cr₂O₃是絕緣體,它包覆在鈣鈦礦顆粒表面形成厚厚的勢壘層,自旋電子難以穿越;復合樣品在室溫附近很寬泛溫區(qū)磁電阻大大增強,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

【文章頁數(shù)】：6 頁

【文章目錄】：
1實驗
2結果與討論
    2.1結構
    2.2電輸運性質
    2.3磁電阻效應
3結語


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