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Thermal properties of monoclinic crystal Er 3+ :Yb 3+ :Ca 4 YO(BO 3 ) 3
Author(s) -
Ge W. W.,
Zhang H. J.,
Wang J. Y.,
Jiang M. H.,
Sun S. Q.,
Ran D. G.,
Xia H. R.,
Boughton R. I.
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889806045407
Subject(s) - monoclinic crystal system , crystallography , crystal (programming language) , yttrium , materials science , single crystal , crystal structure , x ray crystallography , analytical chemistry (journal) , diffraction , chemistry , optics , physics , computer science , metallurgy , programming language , oxide , chromatography
A large Er 3+ –Yb 3+ co‐doped yttrium calcium oxoborate [Er 3+ :Yb 3+ :Ca 4 YO(BO 3 ) 3 , abbreviated as Er:Yb:YCOB] single crystal, with dimensions of 2.5 cm in diameter and 9.0 cm in length, has been grown along the crystallographic b axis by the Czochralski method. X‐ray powder diffraction results show that the as‐grown Er:Yb:YCOB crystal belongs to the monoclinic system with space group Cm ; the unit‐cell constants are a = 8.085, b = 16.048, c = 3.528 Å and β = 101.11°. The high crystalline quality of the as‐grown single crystal was confirmed by high‐resolution X‐ray diffraction, which showed the full width at half‐maximum of the rocking curves to be less than 20 arcseconds on the (060) and (201) diffraction planes. The measurement and calculation of the symmetrical second‐rank tensor for the monoclinic crystal are described in detail in this paper. The principal coefficients of thermal expansion of the as‐grown Er:Yb:YCOB crystal are α I = 11.95 × 10 −6 K −1 , α II = 9.20 × 10 −6 K −1 and α III = 18.93 × 10 −6 K −1 over the temperature range 303.15–873.15 K. The specific heat of the crystal is 725.6 J kg −1 K −1 at 328.15 K. The principal thermal conductivity parameters are K I = 2.882 W m −1 K −1 , K II = 2.687 W m −1 K −1 and K III = 2.692 W m −1 K −1 at 328.15 K.