High-pressure structural study of the scheelite tungstates CaWO{sub 4} and SrWO{sub 4}
Abstract
Angle-dispersive x-ray-diffraction and x-ray-absorption near-edge structure measurements have been performed on CaWO{sub 4} and SrWO{sub 4} up to pressures of approximately 20 GPa. Both materials display similar behavior in the range of pressures investigated in our experiments. As in the previously reported case of CaWO{sub 4}, under hydrostatic conditions SrWO{sub 4} undergoes a pressure-induced scheelite-to-fergusonite transition around 10 GPa. Our experimental results are compared to those found in the literature and are further supported by ab initio total-energy calculations, from which we also predict the instability at larger pressures of the fergusonite phases against an orthorhombic structure with space group Cmca. Finally, a linear relationship between the charge density in the AO{sub 8} polyhedra of ABO{sub 4} scheelite-related structures and their bulk modulus is discussed and used to predict the bulk modulus of other materials, like hafnon.
- Authors:
- Departamento de Fisica Aplicada-ICMUV, Universitat de Valencia, Edificio de Investigacion, c/Dr. Moliner 50, 46100 Burjassot, Valencia (Spain)
- Departamento de Fisica Aplicada, Universitat Politecnica de Valencia, Cno. de Vera s/n, 46022 Valencia (Spain)
- High Pressure Science and Engineering Center, Department of Physics, University of Nevada, 4505 Maryland Parkway, Las Vegas, Nevada 89154-4002 (United States)
- Departamento de Fisica Fundamental II, Universidad de La Laguna, La Laguna 38205, Tenerife (Spain)
- European Synchrotron Radiation Facility, BP 220, Grenoble, F-38043 (France)
- Publication Date:
- OSTI Identifier:
- 20719777
- Resource Type:
- Journal Article
- Resource Relation:
- Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 72; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevB.72.174106; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; CALCIUM TUNGSTATES; CHARGE DENSITY; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; SPACE GROUPS; STRONTIUM COMPOUNDS; X RADIATION; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY
Citation Formats
Errandonea, D., Pellicer-Porres, J., Segura, A., Ferrer-Roca, Ch., Manjon, F.J., Kumar, R.S., Tschauner, O., Rodriguez-Hernandez, P., Lopez-Solano, J., Radescu, S., Mujica, A., Munoz, A., and Aquilanti, G.. High-pressure structural study of the scheelite tungstates CaWO{sub 4} and SrWO{sub 4}. United States: N. p., 2005.
Web. doi:10.1103/PhysRevB.72.174106.
Errandonea, D., Pellicer-Porres, J., Segura, A., Ferrer-Roca, Ch., Manjon, F.J., Kumar, R.S., Tschauner, O., Rodriguez-Hernandez, P., Lopez-Solano, J., Radescu, S., Mujica, A., Munoz, A., & Aquilanti, G.. High-pressure structural study of the scheelite tungstates CaWO{sub 4} and SrWO{sub 4}. United States. doi:10.1103/PhysRevB.72.174106.
Errandonea, D., Pellicer-Porres, J., Segura, A., Ferrer-Roca, Ch., Manjon, F.J., Kumar, R.S., Tschauner, O., Rodriguez-Hernandez, P., Lopez-Solano, J., Radescu, S., Mujica, A., Munoz, A., and Aquilanti, G.. Tue .
"High-pressure structural study of the scheelite tungstates CaWO{sub 4} and SrWO{sub 4}". United States.
doi:10.1103/PhysRevB.72.174106.
@article{osti_20719777,
title = {High-pressure structural study of the scheelite tungstates CaWO{sub 4} and SrWO{sub 4}},
author = {Errandonea, D. and Pellicer-Porres, J. and Segura, A. and Ferrer-Roca, Ch. and Manjon, F.J. and Kumar, R.S. and Tschauner, O. and Rodriguez-Hernandez, P. and Lopez-Solano, J. and Radescu, S. and Mujica, A. and Munoz, A. and Aquilanti, G.},
abstractNote = {Angle-dispersive x-ray-diffraction and x-ray-absorption near-edge structure measurements have been performed on CaWO{sub 4} and SrWO{sub 4} up to pressures of approximately 20 GPa. Both materials display similar behavior in the range of pressures investigated in our experiments. As in the previously reported case of CaWO{sub 4}, under hydrostatic conditions SrWO{sub 4} undergoes a pressure-induced scheelite-to-fergusonite transition around 10 GPa. Our experimental results are compared to those found in the literature and are further supported by ab initio total-energy calculations, from which we also predict the instability at larger pressures of the fergusonite phases against an orthorhombic structure with space group Cmca. Finally, a linear relationship between the charge density in the AO{sub 8} polyhedra of ABO{sub 4} scheelite-related structures and their bulk modulus is discussed and used to predict the bulk modulus of other materials, like hafnon.},
doi = {10.1103/PhysRevB.72.174106},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 17,
volume = 72,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}
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Controllable synthesis of hierarchical nanostructures of CaWO{sub 4} and SrWO{sub 4} via a facile low-temperature route
CaWO{sub 4} and SrWO{sub 4} nanostructures have been synthesized via a simple microemulsion-mediated route. With careful control of the fundamental experimental parameters including the concentration of reactants, the reaction time and the temperature, the products with different morphologies of dumbbell, coral, rod and dendrite have been obtained, respectively. The possible formation mechanism of these unique morphologies has been proposed based on surfactant self-assembly under different experimental conditions. The as-synthesized CaWO{sub 4} samples with various morphologies exhibit different photoluminescence properties. X-ray powder diffraction, transmission electron microscopy, field-emission scanning electron microscopy, and luminescence spectroscopy were used to characterize these products. -
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