Intergranular tunnelling and field-induced percolation fluctuation of granular composites (La1-zAgzMnO3)/(MnO2/Mn2O3)

被引：0
|
作者：
Zhang, N [1 ]
Bao, JC
Li, G
Geng, T
Chen, JK
机构：
[1] Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
[2] Nanjing Normal Univ, Dept Chem, Nanjing 210097, Peoples R China
[3] Nanjing Normal Univ, Ctr Anal & Measurement, Nanjing 210097, Peoples R China
[4] Shanghai Univ Sci & Technol, Dept Phys, Shanghai 200000, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2005年 / 22卷 / 11期
关键词：
D O I：
10.1088/0256-307X/22/11/059
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the giant magnetoresistance of composites (La1-zAgzMnO3)(1-y)(MnO2/Mn2O3)(y). The magnetoresistive property of the composites shows the characteristics of intergranular tunnelling. A conductivity leap has been observed around y = 0.7. The composite (La0.926Ag0.074MnO3)(0.698)(MnO2/Mn2O3)(0.302) has been found to show the greatest magnetoresistance in the samples. Its room-temperature MR ratio reaches 24% under a field of 1.8 T. These phenomena suggest a percolation transformation and a kind of field-induced fluctuation in percolation in the samples investigated.
引用
收藏
页码：2940 / 2943
页数：4
相关论文
共 50 条
  • [1] Thermodynamic Data for Mn3O4, Mn2O3 and MnO2
    Jacob, K. T.
    Kumar, A.
    Rajitha, G.
    Waseda, Y.
    HIGH TEMPERATURE MATERIALS AND PROCESSES, 2011, 30 (4-5) : 459 - 472
  • [2] PHASE EQUILIBRIUM BETWEEN MNO2 AND MN2O3
    FUKUNAGA, O
    TAKAHASHI, K
    FUJITA, T
    YOSHIMOT.J
    MATERIALS RESEARCH BULLETIN, 1969, 4 (05) : 315 - +
  • [3] Constructing α-MnO2/Mn2O3 heterojunction for formaldehyde oxidation
    Huang X.
    Chen M.
    Li G.
    Wang P.
    Chemosphere, 2024, 349
  • [4] Rational synthesis of α-MnO2 and γ-Mn2O3 nanowires with the electrochemical characterization of α-MnO2 nanowires for supercapacitor
    Chen, XY
    Li, XX
    Jiang, Y
    Shi, CW
    Li, XL
    SOLID STATE COMMUNICATIONS, 2005, 136 (02) : 94 - 96
  • [5] Synthesis and characterization of hierarchically structured mesoporous MnO2 and Mn2O3
    Liu, Mi
    Zhang, Gui-Jun
    Shen, Zhu-Rui
    Sun, Ping-Chuan
    Ding, Da-Tong
    Chen, Tie-Hong
    SOLID STATE SCIENCES, 2009, 11 (01) : 118 - 128
  • [6] APPLICATION OF DIFFERENTIAL THERMAL ANALYSIS TO DISSOCIATION OF MNO2 AND MN2O3
    MATSUSHIMA, T
    THOBURN, WJ
    CANADIAN JOURNAL OF CHEMISTRY-BACK YEAR, 1965, 43 (06): : 1723 - +
  • [7] KINETICS OF FORMATION OF MNSO4 FROM MNO2 MN2O3 AND MN3O4 AND ITS DECOMPOSITION TO MN2O3 OR MN3O4
    INGRAHAM, TR
    MARIER, P
    JOURNAL OF METALS, 1968, 20 (01): : A178 - &
  • [8] KINETICS OF FORMATION OF MNSO4 FROM MNO2 MN2O3 AND MN3O4 AND ITS DECOMPOSITION TO MN2O3 OR MN3O4
    INGRAHAM, TR
    MARIER, P
    TRANSACTIONS OF THE METALLURGICAL SOCIETY OF AIME, 1968, 242 (10): : 2039 - &
  • [9] Synthesis of γ-MnOOH nanorods and their isomorphous transformation into β-MnO2 and α-Mn2O3 nanorods
    Zhou, Fu
    Zhao, Xuemei
    Yuan, Cunguang
    Xu, Hai
    JOURNAL OF MATERIALS SCIENCE, 2007, 42 (24) : 9978 - 9982
  • [10] Structural and Raman studies of MnO2 and Mn2O3 nano-particles
    Srivastava G.
    Dalela S.
    Kumar S.
    Choudhary B.L.
    Alvi P.A.
    Materials Today: Proceedings, 2023, 79 : 169 - 171
12345