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High-pressure scheelite-structure polymorphs of rare-earth vanadates and arsenates
Veröffentlicht/Copyright:
28. Juli 2010
Abstract
A series of rare-earth phosphates, arsenates, vanadates, tantalates and niobates have been reacted at pressures up to 80,000 atm. and temperatures up to 600°C. The structures of the high-pressure phases “quenched” to ambient conditions have been evaluated by x-ray powder diffractometry.
The majority of the arsenates (Sm–Lu) and vanadates (Pr–Lu) undergo a reconstructive transformation from the xenotime- to the scheelite-type structure. The transformation from the monazite- to the scheelite-type structure was observed in PrAsO4 and NdAsO4. The xenotime ⇌ monazite transition was not observed in any phase. Equilibrium p-t curves have been determined for several of these transitions and densities of the high- and low-pressure forms compared.
Published Online: 2010-07-28
Published in Print: 1963-11
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Artikel in diesem Heft
- Kristallstrukturbestimmung von Imidazol (C3N2H4) mit Faltmolekülen*
- Die Kristallstruktur einiger Alkohol-Halbhydrate
- Applications of Fourier-transform theory to electron-density extraction of Patterson functions
- Single crystals grown from small droplets
- The crystal structure of dachiardite
- Structure, growth and morphology of crystals*
- A back-reflection x-ray camera for thermal-expansion studies and the thermal expansion of NaCl from −180°C to 200°C
- High-pressure scheelite-structure polymorphs of rare-earth vanadates and arsenates
- The redetermination and refinement of the crystal structure of rhodonite, (Mn,Ca)SiO3
- The crystal structure of hodgkinsonite Zn2Mn [(OH)2|SiO4]
- Atomic radii in metals
- Derivation of the two-sided, two-colored, band groups with their associated point groups and a numerical correction
- Some crystallographic properties of CaSeO4 and its hydrates
- Space group of biguanide acid sulphate
- The unit-cell of freudenbergite
