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    李克艳

    • 副教授     博士生导师   硕士生导师
    • 性别:女
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:化工学院
    • 学科:工业催化
    • 办公地点:西部校区化工实验楼B223
    • 联系方式:0411-84986484
    • 电子邮箱:keyanli@dlut.edu.cn

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    Hardness of materials: studies at levels from atoms to crystals

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    论文类型:期刊论文

    发表时间:2009-01-01

    发表刊物:CHINESE SCIENCE BULLETIN

    收录刊物:SCIE

    卷号:54

    期号:1

    页面范围:131-136

    ISSN号:1001-6538

    关键字:hardness; atoms; ions; chemical bonds; materials

    摘要:Based on the electron-holding energy per unit volume, we extend the concept of hardness to atomic stiffness, ionic stiffness and bond hardness, investigating the nature of material hardness at these three levels. We find that the stiffness of isolated atoms or ions has no direct connection with the hardness of materials, whereas material hardness is directly related to bond hardness, which is essentially determined by the electron-holding energy of its constituent chemical bonds per unit volume. We establish a model for identifying the hardness of materials on the basis of bond hardness. This work offers a deeper understanding of the nature of material hardness at the atomic level, and provides a practical guide in the search for new superhard materials.