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J. Korean Ceram. Soc. > Volume 39(8); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(8): 795.
doi: https://doi.org/10.4191/kcers.2002.39.8.795
Yb:YCa4O(BO3)3 단결정 성장과 분광 및 열적 특성 연구
김충렬, 이현준1, 유영문
한국광기술원 광소재팀
1부산대학교 물리학과
Crystal Growth of Yb:YCa4O(BO3)3 and Investigation of Spectroscopic and Thermal Properties
Choong-Ryeul Kim, Hyeon-Jun Lee1, Young-Moon Yu
Korea Photonics Technology Institute
1Department of Physics, Pusan National University
Yb:$YCa_4O(BO_3)_3$ (Yb:YCOB) single crystal, in which the concentration of $Yb^{3+}$ ion 20 at%, was grown by the Czocharalski method using an iridium crucible under N2 atmosphere. The optimum growth parameters to get a high quality of single crystals were found to be 1.5∼2 mm/h of pulling rate and 10∼20 rpm of rotation rate. According to the results of spectroscopic properties, absorption edge of Yb:YCOB was 236 nm. Two strong absorption line due to $Yb^{3+}$ ions were observed at 900 and 975 nm. Thermal expansion coefficients of Yb:YCOB crystal along a, b and c crystallographic axes from 320 to 650 K were 12.1${times}10^{-6}$/K, 5.9${times}10^{-6}$/K, 12.9${times}10^{-6}$/K, respectively. Specific heat was 0.162 $cal/g{cdot}K$ at 330 K.
Key words: $Yb:YCa_4O(BO_3)_3$, Single crystal, Czochralski method, Thermal expansion coefficient, Specific heat
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