期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 507, 期 2, 页码 335-340出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.07.174
关键词
Characterization; Crystal structure; Czochralski method; Single crystal growth; Borates; Nonlinear optic materials
A new member of the RECa4O(BO3)(3) crystal system, a neodymium calcium oxoborate [NdCa4O(BO3)(3), abbreviated as NdCOB] single crystal, with dimensions of 30 mm in diameter and 25 mm in length, has been grown along the crystallographic b-axis by the Czochralski method. X-ray powder diffraction results show that the as-grown NdCOB crystal, is of a single phase and belongs to the monoclinic system with space group Cm. The measurement and calculation of the symmetric second-rank tensors representing thermal properties of the monoclinic crystal, including thermal expansion and conductivity, are described in detail in this paper. The principal coefficients of thermal expansion of the as-grown NdCOB crystal are 6.75189, 6.3727 and 12.13381 (10(-6) K-1), respectively, over the temperature range of 303.15-768.15 K. The specific heat of the crystal is 0.65775 J g(-1) K-1 at 300.23 K. The principal thermal conductivity parameters are 1.9642, 1.8885 and 2.0374 W m(-1) K-1, respectively, at 303.35 K. (C) 2010 Published by Elsevier B.V.
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