Pressure dependence of the refractive index and dielectric constant in a fluoroperovskite, KMgF3

Kenji Uchino, Shoichiro Nomura, K. Vedam, Robert E. Newnham, Leslie E. Cross

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19 Scopus citations

Abstract

The hydrostatic-pressure dependence of the refractive index and the low-frequency dielectric constant of a perovskite-type single crystal, KMgF3, have been determined at room temperature. The refractive index n for =589.3 nm increases monotonously in proportion to pressure p with a slope of np=2.46×10-4kbar-1. On the other hand, the dielectric constant at 10 kHz decreases with increasing pressure, from which the electric-displacement-related electrostrictive coefficient Qh (=Q11+2Q12) is calculated as 0.24 m4 C-2. These data are compared with the np values and the Qh coefficients of various alkali fluorides and perovskite oxides.

Original languageEnglish (US)
Pages (from-to)6921-6925
Number of pages5
JournalPhysical Review B
Volume29
Issue number12
DOIs
StatePublished - 1984

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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