Optical quality and structural perfection in La/sub 3/Ga/sub 5/SiO/sub 14/ single crystals grown by Czochralski's method

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6293283

Dubovik, M F; Ivanova, G M; Lebedev, S A; Nazarenko, B P; Tkachenko, V F

Single crystals of La/sub 3/Ga/sub 5/SiO/sub 14/ (LGS, langasite) can act as laser media and are also highly effective piezoelectrics having zero temperature coefficient of frequency. We have grown large langasite single crystals, diameter up to 50 mm and mass up to 600 g, by a modified form of Czochralski's method with automatic control, where we found that the main inhomogeneities are bulk defects, which are localized in the axial section no matter what the orientation for the seed, and inclusions, which include bubbles and microcracks, transverse growth banding, and block structure. These inhomogeneities are related to the growth conditions and make themselves felt in different ways. The optical quality was evaluated from the anomalous birefringence.

• OSTI ID: 6293283
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Vol. 24:3; Other Information: Translated from Izv. Akad. Nauk SSSR, Neorg. Mater.; 24: No. 3, 517-519(Mar 1988)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GALLIUM OXIDES
CRYSTAL DEFECTS
LANTHANUM OXIDES
LASER MATERIALS
OPTICAL PROPERTIES
MONOCRYSTALS
CZOCHRALSKI METHOD
SILICON OXIDES
ABSORPTION SPECTRA
BIREFRINGENCE
INCLUSIONS
ISOTROPY
LATTICE PARAMETERS
PIEZOELECTRICITY
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL GROWTH METHODS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELECTRICITY
GALLIUM COMPOUNDS
LANTHANUM COMPOUNDS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTION
SCATTERING
SILICON COMPOUNDS
SPECTRA
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties