Quadrupolar effects in the temperature dependence of the lattice parameters of HoP[sub 1[minus][ital x]]V[sub [ital x]]O[sub 4]

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.5644· OSTI ID:6767123

Skanthakumar, S; Loong, C; Soderholm, L; Richardson, Jr, J W ^[1]; Abraham, M M; Boatner, L A ^[2]

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1. Intense Pulsed Neutron Source and Chemistry Divisions, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

Powder-neutron-diffraction techniques have been used to investigate the temperature dependence of the structural properties of HoP[sub 1[minus][ital x]]V[sub [ital x]]O[sub 4] for [ital x] values of 0.0, 0.33, 0.52, 0.71, and 1.0. The diffraction data confirm the tetragonal zircon-type crystal structure for all of the samples in the temperature range between 12 and 300 K. The temperature dependence of the lattice parameters of the pure HoPO[sub 4] and HoVO[sub 4], however, exhibits significant anomalies below about 100 K. In HoPO[sub 4], the lattice parameter [ital a] increases with decreasing temperature while [ital c] decreases. In HoVO[sub 4] this behavior is reversed. These anomalies can be explained in terms of quadrupolar interactions of the Ho[sup 3+] ion with the crystalline lattice. In particular, the calculated quadrupole moments for HoPO[sub 4] and HoVO[sub 4] reproduce the observed temperature dependence and the inverse behavior. The anomaly in the thermal expansion is reduced in the case of the mixed phosphate vanadate materials (0[lt][ital x][lt]1) because of the competing Ho[sup 3+] quadrupole contributions.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38; AC05-84OR21400
• OSTI ID: 6767123
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:9; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
EXPANSION
HOLMIUM COMPOUNDS
HOLMIUM PHOSPHATES
LATTICE PARAMETERS
NEUTRON DIFFRACTION
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
QUADRUPOLE MOMENTS
RARE EARTH COMPOUNDS
SCATTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL EXPANSION
TRANSITION ELEMENT COMPOUNDS
VANADATES
VANADIUM COMPOUNDS