SYNTHESIS AND STRUCTURE OF NEW HIGH PRESSURE POLYMORPHS OF RARE-EARTH VANADATES AND ARSENATES. Technical Report No. 14

Technical Report · Sat Jun 30 04:00:00 EDT 1962

OSTI ID:4804227

Stubican, V; Roy, R

A series of rare eanth phosphates, arsenates, vanadates, and tantalates were reacted at pressures up to 80,000 atm and 600 deg C. The structures of the resulting products were evaluated by powder x-ray diffractometry. The majority of the arsenates and vanadates (Pr-Lu) undergo a reconstructive transformation from either the monazite or the xenotime (zircon) structure to the scheelite structure. Not a single instance of the xenotime in equilibrium monazite reaction was observed. Equilibrium p-t curves were determined for most of these transitions. (auth)

• Research Organization: Pennsylvania State Univ., University Park. Coll. of Mineral Industries
• NSA Number: NSA-16-029377
• OSTI ID: 4804227
• Report Number(s): NP-11997
• Country of Publication: United States
• Language: English

Related Subjects

ARSENATES
ARSENIC OXIDES
CALCIUM OXIDES
DIAGRAMS
DIFFRACTION
FABRICATION
HIGH TEMPERATURE
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
MONAZITES
OXIDES
PHOSPHATES
PHTHALIC ACID
PRESSURE
RARE EARTHS
REACTION KINETICS
SCHEELITE
STANDARDS
TANTALUM OXIDES
THERMODYNAMICS
TUNGSTATES
TUNGSTEN OXIDES
VANADIUM OXIDES
X RADIATION
XENOTIME
YTTRIUM COMPOUNDS
YTTRIUM PHOSPHATES