Growth, structure, defects and polarized absorption spectral properties of Er:Yb:YCa{sub 4}O(BO{sub 3}){sub 3} crystals

Journal Article · Fri Jan 15 00:00:00 EST 2016 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.10.021· OSTI ID:22573999

Zhong, Degao ^[1]; Teng, Bing ^[1]; Kong, Weijin; Zhang, Shiming; Li, Yuyi ^[1]; Li, Jianhong ^[2]; Yang, Liting; Cao, Lifeng ^[1]; Van Smaalen, Sander ^[3]

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1. College of Physics, Qingdao University, Qingdao 266071 (China)
2. CRYSTECH Inc., 266107 Qingdao (China)
3. Laboratory of Crystallography, University of Bayreuth, Bayreuth 95447 (Germany)

YCa{sub 4}O(BO{sub 3}){sub 3} (YCOB) crystals co-doped with 3 at% Er{sup 3+} and 20 at% Yb{sup 3+} were successfully grown by the Czochralski method. X-ray powder diffraction (XRPD) results show that the as-grown Er:Yb:YCOB crystal belongs to the monoclinic system with space group Cm. And the lattice parameters are a=8.076(8) Å, b=16.023(7) Å, c=3.528(4) Å and β=101.15(4)°. Crystal defects were revealed by chemical etching experiments. The density of etch pits, attributed to dislocations and observed on (010) planes, was found to be not uniform along the crystal diameter. The detailed polarized absorption spectra were measured. The polarized absorption cross sections at 977 nm are 1.01×10{sup −20}, 1.22×10{sup −20} and 1.05×10{sup −20} cm{sup 2} for E//X, E//Y and E//Z, respectively. And the polarized absorption cross sections at 1538 nm is about 1.86×10{sup −20} cm{sup 2} for both E//X and E//Z, but for E//Y the result is 1.03×10{sup −20} cm{sup 2}, which is much smaller. The relationship between the crystal structure and absorption spectra was discussed. - Graphical abstract: The as-grown bulk Er:Yb:YCOB crystal (the long axis is along the b-axis) and LeBail fit to the XRPD pattern of Er:Yb:YCOB (top) compared to the diffraction pattern of YCOB from the JCPDS data bank (bottom). Reflection markers indicate the calculated reflection positions. The middle trace gives the difference between observed and calculated intensity. Reflection indices corresponding to the strongest diffraction peaks are marked on the experimental pattern. - Highlights: • Er:Yb:YCOB crystal with a new composition was grown. • XRPD and FT-IR showed a certain degree of deformation in the crystal structure. • Detailed polarized absorption cross sections at 977 nm and 1538 nm were calculated. • Crystal defects were clearly revealed by chemical etching experiments.

• OSTI ID: 22573999
• Journal Information: Journal of Solid State Chemistry, Vol. 233; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
ABSORPTION SPECTRA
BORATES
COMPARATIVE EVALUATIONS
CROSS SECTIONS
CRYSTALS
CZOCHRALSKI METHOD
DISLOCATIONS
DOPED MATERIALS
ERBIUM IONS
FOURIER TRANSFORMATION
INFRARED SPECTRA
LATTICE PARAMETERS
MONOCLINIC LATTICES
REFLECTION
SPACE GROUPS
SPECTROSCOPY
X RADIATION
X-RAY DIFFRACTION
YTTERBIUM IONS