OPTICAL-ABSORPTION PROPERTIES OF PB5GEO4(VO4)(2) SINGLE-CRYSTALS

Authors
GOSPODINOV M PETROVA D SVESHTAROV P MARINOVA V
Citation
M. Gospodinov et al., OPTICAL-ABSORPTION PROPERTIES OF PB5GEO4(VO4)(2) SINGLE-CRYSTALS, Materials research bulletin, 31(8), 1996, pp. 1001-1005
Citations number
12
Categorie Soggetti
Material Science
Journal title
Materials research bulletin → ACNP
ISSN journal
00255408
Volume
31
Issue
8
Year of publication
1996
Pages
1001 - 1005
Database
ISI
SICI code
0025-5408(1996)31:8<1001:OPOPS>2.0.ZU;2-Y
Abstract
Thermal and pulling conditions have been optimized in a laboratory Czo chralski apparatus to yield optically homogeneous crystals of hexagona l Pb5GeO4(VO4)(2). The wavelength dependence of absorption coefficient was calculated from transmission and reflection measurements in the v isible region. A hypothesis regarding the zone structure in connection to the fundamental absorption edge was raised and the bandgap width c orresponding to indirect transition at room temperature was determined from the alpha(1/2)-hv curve.