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Superstructure in SmCo7 phase.

Hong-Chun Yu, Jian-Qi Li, Yuan-Qian Bei

    Journal of Electron Microscopy
    |April 14, 2004
    PubMed
    Summary

    SmCo7 alloys exhibit a superstructure phase, stable below 670 K. Copper substitution in SmCo3.5Cu3.5 destabilizes this phase above 480 K, impacting magnetic properties.

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    Area of Science:

    • Materials Science
    • Solid State Physics
    • Crystallography

    Background:

    • Samarium-cobalt (Sm-Co) alloys are important magnetic materials.
    • Understanding their microstructural features is crucial for optimizing their properties.
    • SmCo7 and its derivatives are known for complex crystal structures.

    Purpose of the Study:

    • To systematically investigate the microstructural characteristics of SmCo(7-x)Cu(x) alloys.
    • To determine the nature and stability of the SmCo7 superstructure.
    • To analyze the effect of copper substitution on the crystal structure and phase stability.

    Main Methods:

    • Transmission electron microscopy (TEM) was employed for microstructural analysis.
    • In situ cooling and heating experiments were conducted.
    • Crystallographic analysis was performed to interpret the observed structures.

    Main Results:

    • SmCo7 was identified as a superstructure phase with a specific modulation wave vector.
    • The superstructure arises from the ordered substitution of cobalt pairs for samarium atoms in the SmCo5 structure.
    • The superstructure phase is stable below 670 K.
    • Copper substitution in SmCo3.5Cu3.5 did not alter the crystal structure but reduced the stability range of the superstructure phase to temperatures above 480 K.

    Conclusions:

    • The SmCo7 phase possesses a distinct superstructure.
    • The stability of this superstructure is temperature-dependent.
    • Copper substitution significantly influences the thermal stability of the SmCo7 superstructure phase.

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