Optical and Dilatometric Manifestations of Phase Transitions in K_{2}SeO_{4} Crystal

• Authors: B. Andriyevsky , O. Myshchyshyn
• Languages of publication: EN

Abstracts

EN

Temperature dependencies of the characteristic optical paths difference D(Τ) of K2SeO4 crystal in the range of 80-295 K were measured using the Jamen type interferometer. Significant anomalies of D(Τ) dependencies in the vicinity of incommensurate-paraelectric phase transition (T_{i} = 130 K) are observed. On the basis of D(Τ) temperature dependencies measured experimentally and linear expansion l(Τ) known, the temperature derivative of the refractive indices dn/dT are found to be negative in the ranges above and below the temperature T_{i}=130 K.

Keywords

EN

78.20.Fm   64.70.Kb  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 92
• Issue: 3
• Pages: 557-562

Dates

published

1997-09

received

1997-04-23