TY - JOUR
T1 - Conversion of non-stoichiometry of LiNbO3 to constitutional stoichiometry by impurity doping
AU - Kimura, Hiromitsu
AU - Uda, Satoshi
N1 - Funding Information:
The corresponding author is supported by a Research Fellowship of the Japan Society for the promotion of Science for Young Scientists.
PY - 2009/8/1
Y1 - 2009/8/1
N2 - Several chemical components exist in the oxide melt, including ionic species. During crystal growth these are partitioned into the solid phase with their own equilibrium partitioning coefficients. Therefore, they are usually segregated, even at the congruent composition. However, when a compound has a stoichiometric structure at the congruent composition, the equilibrium partitioning coefficients of all chemical components become unity and segregation does not occur. Segregation of ionic species was observed at the binary congruent composition of LiNbO3 because of its non-stoichiometric structure. On the other hand, the segregation of ionic species did not occur at the ternary congruent composition of MgO-doped LiNbO3 (Li2O:Nb2O5:MgO=45.5:50:4.5). This demonstrates that non-stoichiometry of congruent LiNbO3 was converted to the constitutional stoichiometry at the ternary congruent composition by MgO doping.
AB - Several chemical components exist in the oxide melt, including ionic species. During crystal growth these are partitioned into the solid phase with their own equilibrium partitioning coefficients. Therefore, they are usually segregated, even at the congruent composition. However, when a compound has a stoichiometric structure at the congruent composition, the equilibrium partitioning coefficients of all chemical components become unity and segregation does not occur. Segregation of ionic species was observed at the binary congruent composition of LiNbO3 because of its non-stoichiometric structure. On the other hand, the segregation of ionic species did not occur at the ternary congruent composition of MgO-doped LiNbO3 (Li2O:Nb2O5:MgO=45.5:50:4.5). This demonstrates that non-stoichiometry of congruent LiNbO3 was converted to the constitutional stoichiometry at the ternary congruent composition by MgO doping.
KW - A1. Electric fields
KW - A1. Impurities
KW - A1. Interfaces
KW - A1. Segregation
KW - A2. Micro-pulling-down growth
KW - B1. Niobates
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U2 - 10.1016/j.jcrysgro.2009.06.038
DO - 10.1016/j.jcrysgro.2009.06.038
M3 - Article
AN - SCOPUS:68049122001
SN - 0022-0248
VL - 311
SP - 4094
EP - 4101
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 16
ER -