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  • 1
    Online Resource
    Online Resource
    Crystallization Dynamics and Magnetoresistance of La0.7Ca0.3MnO3 Synthesized by Mechanical Alloying
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 1999
    In:  Acta Physica Sinica Vol. 48, No. 13 ( 1999), p. 230-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 48, No. 13 ( 1999), p. 230-
    Abstract: Pure, single-phase La0.7Ca0.3MnO3 perovskites with giant magnetoresistance effect have been successfully prepared by mechanical alloying. The amorphous phase formed in milled smples transforms at about 920K into perovskite-type phase. Following the law of mass action, crystallization dynamics of the amorphous phase has been discussed. The activation energy for crystallization transformation is calculated to be about 265kJ/mol. The characterization of resistivity ρ(T) for La0.7Ca0.3MnO3 perovskites has also been investigated. At low temperatures T, ρ(T) has a directproportion dependence on T2. With increasing annealing temperature, the slope of ρ-T2 curve decreases. The temperature dependent magnetoresistance effect at temperatures far below the Curie temperature can be well expressed by the equation Δρ/ρ0=p1-p2T3/2-p3T5/2.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.48.230
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 1999
    detail.hit.zdb_id: 203490-6
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  • 2
    Online Resource
    Online Resource
    Effect of Pr3+ Doping Concentration on the Structure and Magnetic Properties of SrFe12O19 Compounds
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 1999
    In:  Acta Physica Sinica Vol. 48, No. 13 ( 1999), p. 93-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 48, No. 13 ( 1999), p. 93-
    Abstract: The isotropic Pr-doped SrFe12O19 powders have been synthesized by mechanical milling and subsequent hear treatment. The effects of Pr3+ doping concentration and annealing condition on the microstructure and magnetic properties have been systematically investigated. It is found that the Pr3+ doping results in the increase of the temperature for the formation of hard magnetic compounds. The Curie temperature of PrxSr1-xFe12O19 samples keeps constant with the variation of composition of the sample; however, it decreases slightly with the increase of annealing temperature. The addition of a small amount of Pr3+ in the samples is beneficial to the improvement of coercivity, but accompanying with the deterioration of magnetization. The effect of annealing temperature on magnetic properties is different for the samples with different compositions.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.48.93
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 1999
    detail.hit.zdb_id: 203490-6
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  • 3
    Online Resource
    Online Resource
    Effect of Different Wheel Speed on Magnetic Properties of Nd8Fe85Mo1B6
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 1999
    In:  Acta Physica Sinica Vol. 48, No. 13 ( 1999), p. 164-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 48, No. 13 ( 1999), p. 164-
    Abstract: The melt-spun ribbons of Nd8Fe85Mo1B6 have been prepared by directly rapid quenching at different wheel speeds. From the result of vibrating sample magnetometer measurement, we found that the magnetic properties of the ribbons are dependent on the wheel speed. X-ray diffraction and thermomagnetic analysis were also used to investigate microstructure and phase composition of the samples. The result shows that the TbCu7 phase increases with increasing wheel speed; at the same time, a decreased grain size of the α-Fe phase is observed. The change of magnetic properties is due to the change of phase composition and grain size of the samples.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.48.164
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 1999
    detail.hit.zdb_id: 203490-6
    Location Call Number Limitation Availability
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    Online Resource
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