Interrelationship between Bond Ionicity and Lattice Instability of III-VI Layer Compounds
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概要
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Spectroscopic ionicities have beer? evaluated for GaS, GaSe and InSe fromexperimental values of the dielectric c:onstant in terms of the Penn-Phillips model.The transverse effective charge and the ratio of bond bending to stretching forceconstants have been compared with the spectroscopic ionicity. These isomorphicIII-V[ layer compounds are found to have characteristic values of ionicity whichlie in the region intermediate betweert those of group III-V and II-V[ compounds,showing that the nature of their valerxce bonds are quite similar to the tetrahedralbond in such cubic compounds. InS sltould have its ionicity comparable to thatof GaSe and InSe if it crystallizes in the layer structure. A survey of experimentalinformations related to the phase transformation of III-Vl compouruds suggeststhat shear mode phonons play a particular role to determine the crystal energy ofInk, leading to the instability of the layer structure.
- 社団法人日本物理学会の論文
- 1981-09-15
著者
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Kuroda Noritaka
The Research Institute For Iron Steel And Other Metals Tohoku University
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NISHINA Yuichiro
The Research Institute for Iron,Steel and Other Metals,Tohoku University
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Nishina Yuichiro
The Research Institute For Iron Steel And Other Metals
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