Pressure-induced phase transitions in AgClO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>

Errandonea, Daniel; Gracia, Lourdes; Beltrán, Armando; Vegas, Α.; Meng, Yue

doi:10.1103/physrevb.84.064103

Cited by 27 publications

(34 citation statements)

References 48 publications

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“…In case of anhydrite the barite-related structure has been reported as orthorhombic (Pbnm) phase through a monazite-type phase at high-pressure and high-temperature conditions, while a distorted-barite related phase (P2 1 2 1 2 1 ) is formed at high pressure itself in BaSO 4 [31]. A related structure is also found as a post-barite phase in AgClO 4 [33]. According with the orthorhombic HP structure we found, the volume change at the second transition is of approximately 14%.…”

Section: Resultsmentioning

confidence: 83%

In situhigh-pressure synchrotron x-ray diffraction study of CeVO4and TbVO4up to 50 GPa

et al. 2011

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Room temperature angle-dispersive x-ray diffraction measurements on zircon-type TbVO 4 and CeVO 4 were performed in a diamond-anvil cell up to 50 GPa using neon as pressure-transmitting medium. In TbVO 4 we found at 6.4 GPa evidence of a non-reversible pressure-induced structural phase transition from zircon to a scheelite-type structure. A second transition to an M-fergusonite-type structure was found at 33.9 GPa, which is reversible. Zircon-type CeVO 4 exhibits two pressureinduced transitions. First an irreversible transition to a monazite-type structure at 5.6GPa and second at 14.7 GPa a reversible transition to an orthorhombic structure. No additional phase transitions or evidences of chemical decomposition are found in the experiments. The equations of state and axial compressibility for the different phases are also determined. Finally, the sequence of structural transitions and the compressibilities are discussed in comparison with other orhtovanadates and the influence of non-hydrostaticity commented.

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Section: Resultsmentioning

confidence: 83%

In situhigh-pressure synchrotron x-ray diffraction study of CeVO4and TbVO4up to 50 GPa

et al. 2011

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“…the cation subarray AB of the post-barite structure can be considered as an intermediate framework between the FeB-type (corresponding to the initial Pnma barite structure) and the CsCl-type structures 6 . Adittionally, Errandonea and coworkers have recently proposed a monoclinic P2 1 /m structure for a HP post-barite phase in AgClO 4 , which also presents an AB sublattice closely related to the CsCl-type structure 13 .…”

Section: Introductionmentioning

confidence: 99%

High-pressure transition to the post-barite phase in BaCrO4hashemite

et al. 2012

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A recent high-pressure study on barium chromate BaCrO 4 reported a phase transition but the structure of the high-pressure phase structure could not be identified.This high-pressure phase was suggested to have a monoclinic structure different from other high-pressure forms of ABO 4 -type compounds. In this work, we have carried out x-ray diffraction measurements up to 46 GPa using He as quasi-hydrostatic pressure medium and Density-Functional Theory calculations. Our studies allow us identifying the high-pressure phase as the P2 1 2 1 2 1 post-barite-type phase, recently reported for

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“…The volume difference is typical of density-functional theory (DFT) calculations at the B3LYP level. [43][44][45] Calculations also provide a good description of the pressure dependence of structural parameters. In particular, by fitting the energy vs. volume curve to a second-order Birch-Murnaghan EOS 39 a bulk modulus (B 0 ) of 74.7 GPa is obtained.…”

Section: Calculations: Scheelite Phasementioning

confidence: 99%

“…19 These differences between calculations and experiments are typical of DFT calculations. 22,[40][41][42][43][44][45][46] However, they usually describe well the pressure dependence of E g .…”

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Compression of scheelite-type SrMoO4 under quasi-hydrostatic conditions: Redefining the high-pressure structural sequence

Errandonea

Gracia

Lacomba-Perales

et al. 2013

Journal of Applied Physics

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The high-pressure behavior of tetragonal SrMoO 4 was analyzed by Raman and optical-absorption measurements. Pressures up to 46.1 GPa were generated using diamond-anvil cells and Ne or N 2 as quasi-hydrostatic pressure-transmitting media. A reversible phase transition is observed at 17.7 GPa. A second transition is found at 28.8 GPa and the onset of a third one at 44.2 GPa. The pressure dependence of Raman-active modes is reported for the different phases and the pressure evolution of the fundamental band-gap reported for the low-pressure phase. The observed changes in the Raman spectra contradict the structural sequence determined from previous experiments performed under higher non-hydrostaticity. This fact suggests that deviatoric stresses can influence pressure-driven transitions in scheelite-type oxides. We also report total-energy, lattice-dynamics, and band-structure calculations. They reproduce accurately the behavior of the physical properties of the low-pressure phase and predict the occurrence of phase transitions at pressures similar to experimental transition pressures. According to theory, the high-pressure phases have monoclinic and orthorhombic structures, which are much more compact than tetragonal scheelite. Theoretical results and experiments are compared with previous studies. V C 2013 American Institute of Physics.

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Pressure-induced phase transitions in AgClO4

Cited by 27 publications

References 48 publications

In situhigh-pressure synchrotron x-ray diffraction study of CeVO4and TbVO4up to 50 GPa

In situhigh-pressure synchrotron x-ray diffraction study of CeVO4and TbVO4up to 50 GPa

High-pressure transition to the post-barite phase in BaCrO4hashemite

Compression of scheelite-type SrMoO4 under quasi-hydrostatic conditions: Redefining the high-pressure structural sequence

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