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Effect of Impressing Rate of Field on Polarization Reversal in Mg Doped Near Stoichiometric Lithium Tantalate Single Crystals

Published online by Cambridge University Press:  01 February 2011

Sarveswaran Ganesamoorthy ,
Masaru Nakamura ,
Shunji Takekawa ,
Somu Kumaragurubaran ,
Kazuya Terabe  and
Kenji Kitamura
Sarveswaran Ganesamoorthy
Affiliation:
Opto Single Crystal Group, Advanced Materials Laboratory, National Institute of Materials Science, 1–1, Namiki, Tsukuba-Shi, Ibaraki 305 0044, Japan
Masaru Nakamura
Affiliation:
Opto Single Crystal Group, Advanced Materials Laboratory, National Institute of Materials Science, 1–1, Namiki, Tsukuba-Shi, Ibaraki 305 0044, Japan
Shunji Takekawa
Affiliation:
Opto Single Crystal Group, Advanced Materials Laboratory, National Institute of Materials Science, 1–1, Namiki, Tsukuba-Shi, Ibaraki 305 0044, Japan
Somu Kumaragurubaran
Affiliation:
Opto Single Crystal Group, Advanced Materials Laboratory, National Institute of Materials Science, 1–1, Namiki, Tsukuba-Shi, Ibaraki 305 0044, Japan
Kazuya Terabe
Affiliation:
Opto Single Crystal Group, Advanced Materials Laboratory, National Institute of Materials Science, 1–1, Namiki, Tsukuba-Shi, Ibaraki 305 0044, Japan
Kenji Kitamura
Affiliation:
Opto Single Crystal Group, Advanced Materials Laboratory, National Institute of Materials Science, 1–1, Namiki, Tsukuba-Shi, Ibaraki 305 0044, Japan
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Abstract

The coercive field measured from ferroelectric hysteresis loop for pure and Mg:SLT (0.5 mol% doped) crystals were found to be independent of ramp rate of voltage, while it depends strongly on ramp rate for Mg:SLT (1 mol% doped) crystals. The measured coercive field decreased monotonously depending on the Mg concentration and low Ec value of 6 kV/cm is obtained for Mg(1.0 mol%)SLT crystal. Internal field of about 1 kV/cm present in pure SLT completely gets vanished in Mg(1.0 mol%)SLT. Spontaneous polarization is insensitive to the Mg addition. The origin of the internal field and large changes in switching fields appear largely to be dependent on the [Li]/[Li+Ta] ratio in crystals. On repeated cycling, the coercive field is found to have a marginal variation in pure and Mg doped SLT crystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF10.9
Copyright
Copyright © Materials Research Society 2005

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References

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