Semiempirical correlation between optical band gap values of oxides and the difference of electronegativity of the elements. Its importance for a quantitative use of photocurrent spectroscopy in corrosion studies

被引:160
作者
DiQuarto, F
Sunseri, C
Piazza, S
Romano, MC
机构
[1] Dipto. Ingegneria Chim. Proc. M., Università di Palermo, Viale delle Scienze
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 14期
关键词
D O I
10.1021/jp970046n
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A semiempirical correlation between the optical band gap of binary oxides and the difference of electronegativity between the oxygen and metallic elements (Pauling's extraionic energy) is proposed. In the frame of the proposed correlation an estimate of the repulsive term in the total lattice energy of ionic oxides is obtained in very good agreement with the existing data. An extension of the correlation to the ternary oxides and hydroxides is proposed by using the concept of average cationic or anionic group electronegativity. The usefulness of the proposed correlation for the in situ characterization of passive films on metals and alloys by photocurrent spectroscopy is illustrated by reporting some preliminary experimental results on Sn and AlTi alloy.
引用
收藏
页码:2519 / 2525
页数:7
相关论文
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