Influence of the growth and annealing atmosphere on the electrical conductivity of LTG crystals

We present the electrical conductivity measurements of La3Ga5.5Ta0.5O14 (LGT) crystals grown by Czochralski (Cz) technique in Ir crucibles and N2 atmosphere containing few percent of O2. In addition, we have studied the effect of thermal annealing on the stability and the thermal conductivity. The e...

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Bibliographic Details
Published in:Optical materials 2017-03, Vol.65, p.99-102
Main Authors: Alani, M., Batis, N., Laroche, T., Nehari, A., Cabane, H., Lebbou, K., Boy, J.J.
Format: Article
Language:English
Subjects:
Czochralski method
Defects
Electrical conductivity
Engineering Sciences
Langasite family
Other
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Summary:We present the electrical conductivity measurements of La3Ga5.5Ta0.5O14 (LGT) crystals grown by Czochralski (Cz) technique in Ir crucibles and N2 atmosphere containing few percent of O2. In addition, we have studied the effect of thermal annealing on the stability and the thermal conductivity. The electrical conductivity depends on the stoichiometry, the inhomogeneous impurities levels, the growth atmosphere and the post-growth annealing conditions. Furthermore, we recorded the UV–Vis transmission spectra of the LGT samples and we note that the less resistive LGT samples have an edge of the intrinsic absorption at the highest wavelengths. •Electrical conductivity of La3Ga5.5Ta0.5O14 (LGT) crystals was studied as a function of the growth and annealing atmosphere.•In LGT crystals, oxygen increases the electrical conductivity by charge carriers creation.•By annealing LGT in oxygen atmosphere, it is possible to create OH defects.•Electrical conductivity in LGT is affected by the impurities presence in the crystal.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2016.09.072