II-IV-V2 and I-III-VI2 nonlinear optical crystals for mid-IR range: Schottky defects concentration

Valerii G. Voevodin; Olga Viktorovna Voevodina

doi:10.1117/12.368333

4 November 1999 II-IV-V₂ and I-III-VI₂ nonlinear optical crystals for mid-IR range: Schottky defects concentration

Valerii G. Voevodin, Olga Viktorovna Voevodina

Proceedings Volume 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics; (1999) https://doi.org/10.1117/12.368333
Event: Material Science and Material Properties for Infrared Optoelectronics, 1998, Kiev, Ukraine

Abstract

The work deals with ternary nonlinear optical crystals of I- III-VI₂, and II-IV-V₂-type. Theoretical thermodynamic method of quasi-chemical reactions was used. Entropy of vacancy was calculated as sum of configuration and vibration components. For the first one uncertainty in positions of new bonds formed by unpaired electrons arisen when one of consistent atoms is deleted and uncertainty in new positions of relaxing atoms were considered. Standard Boltzmann expression for configuration entropy (Delta) S_conf equals (Sigma) klnw and geometry considerations were used. It was assumed that the vibration component is caused by change in vibration frequency of atoms surrounding formed vacancy. Change in length of bonds and in bonding force took into account. Approximate expression for vibration entropy change (Delta) S_vibr equals 3Nkln, geometry considerations and results of bonds lengths calculations were used.

Citation Download Citation

Valerii G. Voevodin and Olga Viktorovna Voevodina "II-IV-V₂ and I-III-VI₂ nonlinear optical crystals for mid-IR range: Schottky defects concentration", Proc. SPIE 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics, (4 November 1999); https://doi.org/10.1117/12.368333

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