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Title: Shock-wave compression of lithium niobate from 2. 4 to 44 GPa

Abstract

Shock compression of lithium niobate above the Hugoniot elastic limit (about 2.5 GPa) reveals a succession of unusual features. Just above the Hugoniot elastic limit, the shock velocity is observed to be well below the bulk sound speed, indicative of a drastic reduction of shear strength. The shock velocity is observed to increase with particle velocity at an unusually large rate due to the reduction of strength in a very stiff material and an anomalously large pressure derivative of the bulk modulus. This later behavior may be due to the effects of localized shock heating resulting from heterogeneous shear deformation in ferroelectrics like lithium niobate and lithium tantalate in which increases in temperature are shown to have a strong effect on bulk modulus. A shock-induced polymorphic phase transition occurs at 13.9 GPa. Above the transition point the slope of the Hugoniot curve relating shock velocity and particle velocity is unusually low, indicative of a broad mixed phase region of undetermined extent. Limited work is reported on the isomorphous crystal, lithium tantalate, which exhibits features similar to lithium niobate with a Hugoniot elastic limit of 4 GPa and a phase transition in the vicinity of 19 GPa.

Authors:
;
Publication Date:
Research Org.:
Sandia Laboratories, Albuquerque, New Mexico 87185
OSTI Identifier:
5854281
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.; (United States)
Additional Journal Information:
Journal Volume: 50:11
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LITHIUM COMPOUNDS; COMPRESSION; SHOCK WAVES; NIOBATES; ELASTICITY; FERROELECTRIC MATERIALS; PARTICLES; PHASE TRANSFORMATIONS; SHEAR PROPERTIES; TANTALATES; TEMPERATURE DEPENDENCE; VELOCITY; VERY HIGH PRESSURE; ALKALI METAL COMPOUNDS; DIELECTRIC MATERIALS; MATERIALS; MECHANICAL PROPERTIES; NIOBIUM COMPOUNDS; OXYGEN COMPOUNDS; TANTALUM COMPOUNDS; TENSILE PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 360603* - Materials- Properties

Citation Formats

Stanton, P L, and Graham, R A. Shock-wave compression of lithium niobate from 2. 4 to 44 GPa. United States: N. p., 1979. Web. doi:10.1063/1.325891.
Stanton, P L, & Graham, R A. Shock-wave compression of lithium niobate from 2. 4 to 44 GPa. United States. https://doi.org/10.1063/1.325891
Stanton, P L, and Graham, R A. 1979. "Shock-wave compression of lithium niobate from 2. 4 to 44 GPa". United States. https://doi.org/10.1063/1.325891.
@article{osti_5854281,
title = {Shock-wave compression of lithium niobate from 2. 4 to 44 GPa},
author = {Stanton, P L and Graham, R A},
abstractNote = {Shock compression of lithium niobate above the Hugoniot elastic limit (about 2.5 GPa) reveals a succession of unusual features. Just above the Hugoniot elastic limit, the shock velocity is observed to be well below the bulk sound speed, indicative of a drastic reduction of shear strength. The shock velocity is observed to increase with particle velocity at an unusually large rate due to the reduction of strength in a very stiff material and an anomalously large pressure derivative of the bulk modulus. This later behavior may be due to the effects of localized shock heating resulting from heterogeneous shear deformation in ferroelectrics like lithium niobate and lithium tantalate in which increases in temperature are shown to have a strong effect on bulk modulus. A shock-induced polymorphic phase transition occurs at 13.9 GPa. Above the transition point the slope of the Hugoniot curve relating shock velocity and particle velocity is unusually low, indicative of a broad mixed phase region of undetermined extent. Limited work is reported on the isomorphous crystal, lithium tantalate, which exhibits features similar to lithium niobate with a Hugoniot elastic limit of 4 GPa and a phase transition in the vicinity of 19 GPa.},
doi = {10.1063/1.325891},
url = {https://www.osti.gov/biblio/5854281}, journal = {J. Appl. Phys.; (United States)},
number = ,
volume = 50:11,
place = {United States},
year = {1979},
month = {11}
}