The role of nonstoichiometry in 180° domain switching of LiNbO3 crystals

Venkatraman Gopalan; Terence E. Mitchell; Y. Furukawa; K. Kitamura

doi:10.1063/1.121491

The role of nonstoichiometry in 180° domain switching of LiNbO₃ crystals

Venkatraman Gopalan, Terence E. Mitchell, Y. Furukawa, K. Kitamura

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316 Scopus citations

Abstract

We show here conclusively that the internal field originates from nonstoichiometric point defects in LiNbO₃ crystals. The switching fields required for 180° domain reversal in congruent crystals [C=Li₂O/(Li₂O+Nb₂O₅)=0.484] are ∼4-5 times larger than the switching fields for nearstoichiometric crystals (C=0.498). An internal field of ∼2.5 kV/mm observed in congruent crystals disappears in stoichiometric crystals. The concentration of hydrogen incorporated during crystal growth has no effect on the switching or internal fields. The measured spontaneous polarization, P_s=80±5 μC/cm² is relatively insensitive to the crystal nonstoichiometry and the hydrogen content.

Original language	English (US)
Pages (from-to)	1981-1983
Number of pages	3
Journal	Applied Physics Letters
Volume	72
Issue number	16
DOIs	https://doi.org/10.1063/1.121491
State	Published - 1998

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.121491

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title = "The role of nonstoichiometry in 180° domain switching of LiNbO3 crystals",

abstract = "We show here conclusively that the internal field originates from nonstoichiometric point defects in LiNbO3 crystals. The switching fields required for 180° domain reversal in congruent crystals [C=Li2O/(Li2O+Nb2O5)=0.484] are ∼4-5 times larger than the switching fields for nearstoichiometric crystals (C=0.498). An internal field of ∼2.5 kV/mm observed in congruent crystals disappears in stoichiometric crystals. The concentration of hydrogen incorporated during crystal growth has no effect on the switching or internal fields. The measured spontaneous polarization, Ps=80±5 μC/cm2 is relatively insensitive to the crystal nonstoichiometry and the hydrogen content.",

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doi = "10.1063/1.121491",

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T1 - The role of nonstoichiometry in 180° domain switching of LiNbO3 crystals

AU - Gopalan, Venkatraman

AU - Mitchell, Terence E.

AU - Furukawa, Y.

AU - Kitamura, K.

PY - 1998

Y1 - 1998

N2 - We show here conclusively that the internal field originates from nonstoichiometric point defects in LiNbO3 crystals. The switching fields required for 180° domain reversal in congruent crystals [C=Li2O/(Li2O+Nb2O5)=0.484] are ∼4-5 times larger than the switching fields for nearstoichiometric crystals (C=0.498). An internal field of ∼2.5 kV/mm observed in congruent crystals disappears in stoichiometric crystals. The concentration of hydrogen incorporated during crystal growth has no effect on the switching or internal fields. The measured spontaneous polarization, Ps=80±5 μC/cm2 is relatively insensitive to the crystal nonstoichiometry and the hydrogen content.

AB - We show here conclusively that the internal field originates from nonstoichiometric point defects in LiNbO3 crystals. The switching fields required for 180° domain reversal in congruent crystals [C=Li2O/(Li2O+Nb2O5)=0.484] are ∼4-5 times larger than the switching fields for nearstoichiometric crystals (C=0.498). An internal field of ∼2.5 kV/mm observed in congruent crystals disappears in stoichiometric crystals. The concentration of hydrogen incorporated during crystal growth has no effect on the switching or internal fields. The measured spontaneous polarization, Ps=80±5 μC/cm2 is relatively insensitive to the crystal nonstoichiometry and the hydrogen content.

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SP - 1981

EP - 1983

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 16

ER -

The role of nonstoichiometry in 180° domain switching of LiNbO₃ crystals

Abstract

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