Manipulation of displacive phase transformations. [LaNb/sub 1-x/V/sub x/O/sub 4/; BiV/sub 1-x/Nb/sub x/O/sub 4/]

Conference · Tue Apr 01 04:00:00 EST 1986

OSTI ID:5515819

Nevitt, M V; Chan, S K; Aldred, A T

The effect of ion substitutions on displacive higher-order phase transformations in ABO/sub 4/ compounds is discussed with respect to the LaNb/sub 1-x/V/sub x/O/sub 4/ and BiV/sub 1-x/Nb/sub x/O/sub 4/ systems. Although both types of substitution suppress the paraelastic to ferroelastic transformation temperature, their effects on lattice dimensions are of opposite signs. Two alternative explanations are put forward for the suppression of the transformation. One involves the changing coordination around the BO/sub 4/ tetrahedra when B is V/sup 5 +/ or Nb/sup 5 +/. The second involves application of the ideas of percolation theory, and a plausible estimate can be made of the critical composition at which the monoclinic phase becomes unstable.

• Research Organization: Argonne National Lab., IL (USA). Materials Science and Technology Div.
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5515819
• Report Number(s): CONF-860608-5; ON: DE86014490
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
BISMUTH COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
LANTHANUM COMPOUNDS
NIOBATES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VANADATES
VANADIUM COMPOUNDS