Two ferromagnetic phases with different spin states of Mn and Ni in LaMn0.5Ni0.5O3 -: art. no. 184416

被引:125
作者
Joly, VLJ [1 ]
Joy, PA
Date, SK
Gopinath, CS
机构
[1] Natl Chem Lab, Phys & Mat Chem Div, Pune 411008, Maharashtra, India
[2] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India
关键词
D O I
10.1103/PhysRevB.65.184416
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A ferromagnetic transition below 280 K is observed in the temperature variation of the magnetization, measured using high magnetic fields, for samples of LaMn0.5Ni0.5O3 synthesized by the high-temperature solid-state reaction method. On the other hand, two well-defined magnetic transitions, at similar to150 and similar to280 K, are observed in low-field zero-field-cooled (ZFC) magnetization (M-ZFC) measurements on these samples, indicating the possibility for the existence of two different ferromagnetic phases of the compound. LaMn0.5Ni0.5O3, synthesized by a low-temperature method, shows a single magnetic transition at similar to150 K for samples annealed below 500 degreesC and a single magnetic transition at 280 K for samples annealed above 1000 degreesC in the low-field M-ZFC measurements. Broad or multiple magnetic transitions are observed for the low-temperature samples annealed in the temperature range 500-1000 degreesC. High-temperature magnetic susceptibility, powder x-ray-diffraction, and core-level x-ray photoelectron spectroscopic studies on the single-phase samples (annealed at 400 and 1300 degreesC) indicate that the nanocrystalline material (obtained at 400 degreesC) with spin states of Mn and Ni as Mn4+ and Ni2+ undergoes a magnetic transition below 150 K, whereas high temperature (1300 degreesC) annealed material with spin states like Mn3+ and low-spin Ni3+ becomes ferromagnetic below 280 K. A charge disproportionation of the type Mn4++Ni2+-->Mn3++Ni3+ takes place when the low-temperature synthesized LaMn0.5Ni0.5O3 is annealed above 500 degreesC. The results give evidence for the existence of two different phases of LaMn0.5Ni0.5O3 with different crystal structures and different spin states of Mn and Ni.
引用
收藏
页码:1 / 11
页数:11
相关论文
共 49 条
  • [31] NEUTRON DIFFRACTION STUDY OF SR2(FEMO)O6
    NAKAYAMA, S
    NAKAGAWA, T
    NOMURA, S
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1968, 24 (01) : 219 - &
  • [32] STUDIES OF NICKEL-TUNGSTEN-ALUMINA CATALYSTS BY X-RAY PHOTOELECTRON-SPECTROSCOPY
    NG, KT
    HERCULES, DM
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1976, 80 (19) : 2094 - 2102
  • [33] NMR-STUDY ON THE SUPERTRANSFERRED HYPERFINE MAGNETIC-FIELD AT MN-55 IN FERROMAGNETIC PEROVSKITES LA(CO1-XMGX)(0.5)MN0.5O3
    NISHIMORI, N
    ASAI, K
    MIZOGUCHI, M
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1995, 64 (04) : 1326 - 1333
  • [34] ALaMnBO6 (A = Ca, Sr, Ba; B = Fe, Ru) double perovskites
    Ramesha, K
    Thangadurai, V
    Sutar, D
    Subramanyam, SV
    Subbanna, GN
    Gopalakrishnan, J
    [J]. MATERIALS RESEARCH BULLETIN, 2000, 35 (04) : 559 - 565
  • [35] MAGNETIC AND ELECTRICAL PROPERTIES OF BA2MREO6 ORDERED PEROVSKITES
    SLEIGHT, AW
    WEIHER, JF
    [J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1972, 33 (03) : 679 - &
  • [36] MAGNETIZATION MEASUREMENT AND MN-55 NMR-STUDY OF LA(NI1-XMGX)0.5MN0.5O3
    SONOBE, M
    ASAI, K
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1992, 61 (11) : 4193 - 4203
  • [37] Synthesis and characterization of LaCr1-xNixO3 perovskite oxide catalysts
    Stojanovic, M
    Haverkamp, RG
    Mims, CA
    Moudallal, H
    Jacobson, AJ
    [J]. JOURNAL OF CATALYSIS, 1997, 166 (02) : 315 - 323
  • [38] Electronic structure of La 3d in gallate and aluminate single crystals
    Talik, E
    Novosselov, A
    Kulpa, M
    Pajaczkowska, A
    [J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2001, 321 (01) : 24 - 26
  • [39] Magnetic and electronic properties of a single crystal of ordered double perovskite Sr2FeMoO6
    Tomioka, Y
    Okuda, T
    Okimoto, Y
    Kumai, R
    Kobayashi, KI
    Tokura, Y
    [J]. PHYSICAL REVIEW B, 2000, 61 (01): : 422 - 427
  • [40] Synthesis and characterization of Ln(B0.5Mn0.5)O-3 (Ln-lanthanoid; B=Ni,Co) perovskites
    Troyanchuk, IO
    Samsonenko, NV
    Shapovalova, EF
    Szymczak, H
    Nabialek, A
    [J]. MATERIALS RESEARCH BULLETIN, 1997, 32 (01) : 67 - 74