Effect of hydrostatic pressure on the incommensurate phase of K/sub 2/SeO/sub 4/

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.332· OSTI ID:5310680

Press, W; Majkrzak, C F; Axe, J D; Hardy, J R; Massa, N E; Ullman, F G

A neutron scattering study of the effect of hydrostatic pressure on the incommensurate phase transformation in K/sub 2/SeO/sub 4/ was performed in order to obtain information concerning the nature of the competing forces that give rise to a structural instability at a general wave vector. It was found that an increase in pressure lowers the transition temperature (dT/sub i//dP/sub i/=-6.5 K/kbar) and results in a smaller value of the initial incommensurate wave vector. The pressure dependence of the incommensurate to ferroelectric phase transition was also investigated (dT/sub c//dP/sub c/ approx. = -9 K/kbar). The latter transition displays a distinct pressure hysteresis.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 5310680
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 22:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL-PHASE TRANSFORMATIONS
DIELECTRIC MATERIALS
DIFFRACTION
FERROELECTRIC MATERIALS
MATERIALS
NEUTRON DIFFRACTION
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
PRESSURE DEPENDENCE
SCATTERING
SELENATES
SELENIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE