An analysis of the photoelastic behaviour of fluorite-structure crystals is performed by considering the existing theories of electronic polarizabilities of ions. On the basis of experimental and theoretical information available for electronic polarizabilities it is assumed that the change in polarizability due to strain under the effect of hydrostatic pressure is mainly arising from the change in anion polarizability. Values of strain polarizability parameters and volume derivatives of refractive index or electronic dielectric constant are evaluated and compared with experimental data for CaF₂, SrF₂, BaF₂, PbF₂, Sr(NO₃)₂, Ba(NO₃)₂, and Pb(NO₃)₂ crystals.

Abstract

Es wird eine Analyse des photoelastischen Verhaltens von Kristallen mit Fluorit-Struktur mit vorhandenen Theorien der elektronischen Polarisierbarkeit der Ionen durchgeführt. Auf der Grundlage verfügbarer experimenteller und theoretischer Informationen für die elektronischen Polarisierbarkeiten wird angenommen, daß die Polarisierbarkeitsänderung infolge von Spannungen unter dem Einfluß von hydrostatischem Druck hauptsächlich von der Änderung der Anionenpolarisierbarkeit herrührt. Werte der Spannungs-Polarisierbarkeitsparameter und der Volumenableitung des Brechungsindex oder der elektronischen Dielektrizitätskonstante werden berechnet und mit experimentellen Werten für CaF₂-, SrF₂-, BaF₂-, PbF₂-, Sr(NO₃)₂-, Ba(NO₃)₂- und Pb(NO₃)₂-Kristallen verglichen.

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Volume127, Issue1

1 January 1985

Pages 67-71

Analysis of Photoelastic Behaviour of Fluorite-Structure Crystals

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Analysis of Photoelastic Behaviour of Fluorite-Structure Crystals

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