Growth defects of lead germanate single crystals grown by the vertical Bridgman method

Journal Article · Mon Aug 15 00:00:00 EDT 2005 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2005.04.003· OSTI ID:20748765

Xianjun, Wu ^[1]; Jiayue, Xu ^[1]; Weiqing, Jin ^[1]

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1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Dingxi Road 1295, Shanghai 200050 (China)

Lead germanate, Pb{sub 5}Ge{sub 3}O{sub 11} (PGO) single crystals have been grown by the modified vertical Bridgman method. An optical microscope and an electron probe X-ray microanalyser (EPMA) were used to investigate the growth defects, such as inclusions, negative crystal, bubbles and boundaries. Light scattering particles were observed, most of which were related to PbO inclusions. The formation of negative hexagonal crystals is described. Bubbles and boundaries were also observed in as-grown PGO crystals. An incomplete cleavage plane was also found. To reduce and eliminate growth defects, some suggestions are presented which were performed during growth experiments.

• OSTI ID: 20748765
• Journal Information: Materials Characterization, Vol. 55, Issue 2; Other Information: DOI: 10.1016/j.matchar.2005.04.003; PII: S1044-5803(05)00111-7; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BRIDGMAN METHOD
BUBBLES
CLEAVAGE
CRYSTAL GROWTH
DEFECTS
ELECTRON MICROPROBE ANALYSIS
ELECTRON PROBES
FERROELECTRIC MATERIALS
GERMANATES
INCLUSIONS
LEAD OXIDES
LIGHT SCATTERING
MONOCRYSTALS
OPTICAL MICROSCOPES
X RADIATION