Phase equilibria and glass crystallization in the Na/sub 2/O-La/sub 2/O/sub 3/-Y/sub 2/O/sub 3/-P/sub 2/O/sub 5/ system

Journal Article · Fri Aug 01 00:00:00 EDT 1986 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:7225092

Fedorova, E N; Barabanova, T R; Kozhina, I I; Shmatok, L K

The authors have examined the phase equilibrium, glass crystallization and glass-formation regions for four sections in the system Na/sub 2/O-La/sub 2/O/sub 3/-Y/sub 2/O/sub 3/-P/sub 2/0/sub 5/: La(PO/sub 3/)/sub 3/-NaPO/sub 3/; Y(PO/sub 3/)/sub 3/-NaPO/sub 3/; La(PO/sub 3/)/sub 3/-Y(PO/sub 3/)/sub 3/, and LaP/sub 5/O/sub 14/-YP/sub 5/O/sub 14/. The glasses were made in a silicate furnace by the use of quartz crucibles and stirrers. The initial materials were Na/sub 2/CO/sub 3/, La/sub 2/O/sub 3/, Y/sub 2/O/sub 3/ and 70% H/sub 3/PO/sub 4/, all of ultrapure grade. The firing temperatures varied from 1000 to 1550/sup 0/C with the composition. The crystallization capacity and liquidus temperature were determined by a polythermal method. The phases were analyzed by optical and x-ray methods. The least tendency to crystallize occurs in the pentaphosphate glasses.

• Research Organization: S.I. Vavilov State Optical Institute
• OSTI ID: 7225092
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Vol. 22:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LANTHANUM PHOSPHATES
CRYSTALLIZATION
PHASE DIAGRAMS
PHOSPHATE GLASS
SODIUM PHOSPHATES
YTTRIUM PHOSPHATES
EQUILIBRIUM
LANTHANUM OXIDES
OPTICAL PROPERTIES
ORTHORHOMBIC LATTICES
SODIUM OXIDES
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION
YTTRIUM OXIDES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIAGRAMS
DIFFRACTION
GLASS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies