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Postgrown Li-rich vapor transport equilibration-induced Mg diffusion within MgO:LiNbO3 crystal

Published online by Cambridge University Press:  31 January 2011

De-Long Zhang ,
Hui Zheng ,
Ping-Rang Hua  and
Edwin Yue-Bun Pun
Ping-Rang Hua
Affiliation:
Department of Opto-electronics and Information Engineering, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, People's Republic of China; Key Laboratory of Optoelectronics Information and Technical Science (Tianjin University), Ministry of Education, Tianjin 300072, People's Republic of China; and Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
Edwin Yue-Bun Pun
Affiliation:
Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, People's Republic of China
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Abstract

A number of congruent LiNbO3 crystals homogeneously doped with 5 mol% Mg in growth melt were subjected to Li-rich vapor transport equilibration (VTE) treatments at 1100 °C for different durations. Secondary ion mass spectrometry study shows that the VTE induces the Mg diffusion within the crystal and an inhomogeneous Mg depth profile. The surface Mg concentration, determined from measured ordinary refractive index, shows a strong VTE duration dependence. Neutron activation analysis shows that the amount of MgO diffusing out of the crystal is ignorable, allowing to conclude that the Mg ions counter diffuse to the crystal surface at the early stage of VTE and then come back toward equilibrium as the Li concentration comes to equilibrium. The VTE-induced Li2O content increase in crystal was determined by the gravimetric method. The crystalline phase, crystal composition, and site occupation of Mg and Li are discussed.

Keywords

DiffusionPhase EquilibriaCrystal
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 9 , September 2010 , pp. 1817 - 1821
Copyright
Copyright © Materials Research Society 2010

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