摘要
The density and surface tension of the K_(2)O-Nb_(2)O_(5) molten system between 50 and 56mol%K_(2)O melts were measured from 1080 to 1180℃.The concentration of K_(2)O from 50 to 56mol%in melt not only caused the density of melt to decrease,but also induced the surface tension to decrease.Both composition gradient and the temperature coefficient of density exist extremum within this composition range.These properties are possibly employed to explain why the KNbO3 crystal should be grown at the composition from 52 to 54mo1%K_(2)O at above 1150℃.
基金
Supported by the National Natural Science Foundation of China
grant for Key Research Project in Climbing Program from the State Science and Technology Commission of China.
