High-pressure Raman study of the perovskite BaCeO3

Loridant, S.; Lucazeau, G.

doi:10.1002/(sici)1097-4555(199906)30:6<485::aid-jrs403>3.0.co;2-n

Cited by 27 publications

(45 citation statements)

References 16 publications

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“…The appearance of a Raman spectrum within the cubic symmetry with the Pm 3 m space group is quite common for the perovskite materials 15–24. For example, such a phenomenon was observed in our previous studies in the case of BaZrO 3 : Ln15, 20; the observed Raman spectrum was assumed to have its origin in the nanodomains with a symmetry different from cubic.…”

Section: Discussionmentioning

confidence: 61%

“…High‐pressure Raman studies of some different perovskites have already been performed. Loridant and Lucazeau16 showed the orthorhombic symmetry ( Pnma ) at low pressure values for BaCeO 3 and revealed the presence of two pressure‐induced phase transitions at 22 and 28 GPa. Chemarin et al 17 and Lucazeau18 carried out the study of BaZrO 3 and BaZrO 3 BaCeO 3 solid solutions till about 35 GPa.…”

Section: Introductionmentioning

confidence: 99%

“…These studies show a very interesting structural evolution in the case of pure BaZrO 3 with the disappearance of the Raman spectrum at 9 GPa, which is in good agreement with the ideal cubic symmetry ( Pm 3 m ), and with the further increase of pressure the reappearance of spectrum due to the transition to the rhombohedral symmetry. Actually, the pure BaZrO 3 possesses a Raman spectrum at RT in contrast with the diffraction results showing that for this material the cubic symmetry prohibits Raman active modes19; the appearance of such a spectrum was explained as due to the existence of the nanodomains with the symmetry different from the Pm 3 m cubic symmetry15–20 as observed for many perovskites, for example the PbMg 1/3 Nb 2/3 O 3 PbTiO 3 (PMN‐PT) solid solutions 21–23. The pressure dependence of the Raman spectra of SrTiO 3 was investigated up to 15.5 GPa by Grzechnik et al 24 The authors show that this perovskite undergoes the cubic → tetragonal and then tetragonal → orthorhombic phase transitions near 6 and 15 GPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Substitution and proton doping effect on SrZrO₃ behaviour: high‐pressure Raman study

Slodczyk

Limage

Colomban

et al. 2011

J Raman Spectroscopy

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The high-pressure Raman studies of pure, Yb-modified, protonated and non-protonated SrZrO 3 dense ceramics were performed between 0.1 and 40 GPa using a diamond anvil cell. Lanthanide-modified, protonated SrZrO 3 perovskites are potential materials for electrolytic membrane in fuel cells and electrolysers working at medium temperature. The comparison of the Raman spectra shows important differences in the pressure behaviour between the pure and Yb-modified SrZrO 3 ceramics. SrZrO 3 exhibits a rigid structure without any structural modification, whereas for both SrZr 0.93 Yb 0.07 O 2.965 and SrZr 0.93 Yb 0.07 O 2.962 H 0.003 a sequence of structural modifications at 10, 20 and 35 GPa is revealed. The character of these structural modifications is very similar to that observed as a function of the temperature (orthorhombic Pnma 750 • C → pseudo-tetragonal Imma 840 • C → tetragonal I4/mcm 1070 • C → cubic Pm3m), which suggests that they can be considered as the phase transitions. Despite the low level of proton content (0.3% mole/mole), significant difference between protonated and non-protonated compounds is observed for the 700-750 cm −1 doublet assigned to the Zr-O octahedron stretching mode, perturbed by an oxygen atom vacancy and/or neighbouring Yb ion. The location of proton is discussed.

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Section: Discussionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Substitution and proton doping effect on SrZrO₃ behaviour: high‐pressure Raman study

Slodczyk

Limage

Colomban

et al. 2011

J Raman Spectroscopy

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“…Using a wider pressure range, 0-12 GPa, but two different pressure-transmitting media, Loridant et al determined the bulk modulus of SrCeO 3 to be 127(3) GPa with a pressure derivative of 4.2(8) [20]. The bulk modulus for SrCeO 3 determined by neutron diffraction, lies between the two values for BaCeO 3 that were derived from Raman data by Loridant and Lucazeau [32] (91 GPa for ∼0 GPa≤ P ≤ 5 GPa, and 125 GPa for 5 GPa≤ P ≤ 10 GPa). The measured bulk moduli for the cerate perovskites are significantly smaller than those measured for other A II B IV O 3 [34], CaSnO 3 (167 GPa) [35], CdTiO 3 (214 GPa) and CdSnO 3 (185 GPa) [36].…”

Section: Resultsmentioning

confidence: 94%

Pressure dependence of the crystal structure of SrCeO3 perovskite

Knight

Marshall

Bonanos

et al. 2005

Journal of Alloys and Compounds

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“…Figure 5 reproduced from Ref. 25 gives an answer to this question. One can verify that plots of the wavenumber variations versus relative volume cell variations of the perovskite BaCeO 3 do not coincide for the phonon at about 350 cm 1 while high-pressure plots and low-temperature plots are in good coincidence for the phonon at about 340 cm 1 .…”

Section: Isotropic Approximationmentioning

confidence: 97%

Effect of pressure and temperature on Raman spectra of solids: anharmonicity

Lucazeau

2003

J Raman Spectroscopy

265

222

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This paper gives a brief review of the effect of temperature and pressure on Raman spectra. Anharmonicity, defined by the cubic, quartic and higher terms in the potential expansion, is shown to be responsible for various properties such as dilatation or for variations of wavenumber and half-width of Raman bands with temperature and pressure, or may be strongly involved in phase transitions. This contribution does not pretend to be an exhaustive review on the subject but aims to introduce some basic concepts in a tutorial way before showing how intricated are these manifestations of anharmonicity. Copyright INTRODUCTIONProperties of materials are dependent on temperature and pressure. All applied research consists in studying the temperature and pressure dependence of their physical properties with a view to preparing the material to exhibit the expected properties in specific conditions of thermal and mechanical stress environment. Basic research consists in relating micro/meso-structural properties with the other physical properties. These relations exist via coupling coefficients which are often defined by a linear relationship. The present review presents the relations which govern the temperature and pressure dependence of the usual spectral parameters such as wavenumber, half-width and intensity of Raman bands. We shall point out the nonlinearity, also defined as anharmonicity, of the corresponding relationships. A tutorial and brief presentation of anharmonic effects in solids can be found in Chapter 8 of Ref. 1. As written by Sherman and Wilkinson, 2,3 in a completely harmonic approximation, where the force constant operating between any two masses is truly a constant and independent of the distance between the masses, the application of pressure would cause no observable frequency shift effects at all. The same statement can be done about the effect of temperature. However, as it becomes evident in the present special issue, this is not verified experimentally.Ł Correspondence to: Guy Lucazeau, LEPMI, (CNRS UMR 5631), Institut National Polytechnique de Grenoble, BP 75, F-38402 St. Martin d'Hères, Cedex, France. E-mail: guy.lucazeau@lepmi.inpg.fr † In memory of Evangelos Anastassakis, who should have been solicited for writing a review paper on such a subject.One of the aims of this paper is to point out that the measurements of temperature-or pressure-induced frequency shifts are measurements of the anharmonicity of the interactions that supply the restoring force constants. Let us point out that because pressure or temperature induces isotropic or anisotropic deformations of molecules and crystals, the pressure or stress-induced and the temperatureinduced frequency shifts  / are mainly determined by the associated deformation V/V. It is thus important to analyze the effects of temperature and pressure together. The origin of the deformation induced by these two external parameters is different. Pressure affects the equilibrium spacings between nuclei, distorts the electron clouds and through them...

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High-pressure Raman study of the perovskite BaCeO3

Cited by 27 publications

References 16 publications

Substitution and proton doping effect on SrZrO₃ behaviour: high‐pressure Raman study

Substitution and proton doping effect on SrZrO₃ behaviour: high‐pressure Raman study

Pressure dependence of the crystal structure of SrCeO3 perovskite

Effect of pressure and temperature on Raman spectra of solids: anharmonicity

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High-pressure Raman study of the perovskite BaCeO3

Cited by 27 publications

References 16 publications

Substitution and proton doping effect on SrZrO3 behaviour: high‐pressure Raman study

Substitution and proton doping effect on SrZrO3 behaviour: high‐pressure Raman study

Pressure dependence of the crystal structure of SrCeO3 perovskite

Effect of pressure and temperature on Raman spectra of solids: anharmonicity

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Product

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Substitution and proton doping effect on SrZrO₃ behaviour: high‐pressure Raman study

Substitution and proton doping effect on SrZrO₃ behaviour: high‐pressure Raman study