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    題名: Calculation of the thermodynamic effect of the Brewer-Engel generalized acid-base reactions of 1:1 intermetallics for non-transition metals Al and Mg with transition metals
    作者: Wu, Hui-fen;吳慧芬;Brewer, Leo
    貢獻者: 淡江大學化學學系
    關鍵詞: Brewer-Engel theory;Generalized Lewis acid-base;Modified Born-Haber type cycle;Transition metals;Ionic bonding
    日期: 1997-01-30
    上傳時間: 2009-12-01
    出版者: Elsevier
    摘要: The Brewer-Engel theory has previously provided quantitative predictions of thermodynamic properties and crystal structures of metallic systems which have not previously been subject to generalized Lewis acid-base interactions (L. Brewer, in J.L. Walter, M.R. Jackson and C.T. Sims (eds.), Alloying, ASM International, Metals Park, OH, 1988, pp. 20–27; J. Kouvetakis and L. Brewer, J. Phase Equilib., 14 (1993) 563). The theory has now been extended to cover any combination of metals. A modified Born-Haber type cycle has been used to characterize both covalent and ionic bonding. The understanding of chemical bonding provides the means of predicting a variety of properties. Enhancement of d-bonding is obtained by generalized Lewis acid-base interactions between transition metal atoms (L. Brewer, in J.L. Walter, M.R. Jackson and C.T. Sims (eds.), Alloying, ASM International, Metals Park, OH, 1988, pp. 20–27). In contrast, the d-bonding is reduced when non-transition metals are added to transition metals (L. Brewer, J. Phys. Chem., 94 (1990) 1196). This present paper illustrates the calculation procedures for transition metals added to Al and Mg. The calculations are presented for AB alloys which exhibit CsCl structure for composition of 50 at.% A(transition metal) and 50 at.% B(Al or Mg).
    關聯: Journal of Alloys and Compounds 247(1-2), pp.1-8
    DOI: 10.1016/S0925-8388(96)02653-9
    顯示於類別:[化學學系暨研究所] 期刊論文

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