Phase transitions in BaCeO3: neutron diffraction and Raman studies

Genet, F.; Loridant, S.; Ritter, C.; Lucazeau, G.

doi:10.1016/s0022-3697(99)00031-1

Cited by 83 publications

(68 citation statements)

References 15 publications

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“…Crystallographic data were taken from Genet et al 4 and are summarized in Table 1. The three crystallographic cells are shown in Figs 1-3, in which some internal coordinates used in this study are also shown.…”

Section: Methodsmentioning

confidence: 99%

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Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO₃

Gupta¹,

Simon²,

Pagnier³

et al. 2001

J Raman Spectroscopy

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Raman spectroscopic data for BaCeO 3 were modeled with the use of a small set of force constants in its three phases (Pnma, Imma and R3c) using experimental IR and Raman data. An IR reflectance spectrum of BaCeO 3 in its Pnma phase is provided for the first time. Raman band symmetry assignments in the Pnma phase were re-examined and the assignments of Genet et al. were confirmed. The distribution of the Raman bands of the Pnma phase between the zone center and X point in Imma is provided and band assignments were extended to the Imma and R3c phases. Calculated values for both Raman-and IR-active modes are provided in the three phases. The variations in force constants throughout the phase transitions are briefly discussed.

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Section: Methodsmentioning

confidence: 99%

“…However, it has been observed that some perovskites have an intermediate Imma (D 6 2h ) structure between Pnma and R3c. 2 One such perovskite is BaCeO 3 , which has been extensively studied by neutron scattering 3,4 and Raman spectroscopy. 5,6 Phase transitions occur at 563 K (Pnma !…”

Section: Introductionmentioning

confidence: 99%

Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO₃

Gupta¹,

Simon²,

Pagnier³

et al. 2001

J Raman Spectroscopy

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“…This structure develops in other perovskites (e.g. BaCeO 3 : Genet et al 1999, Knight 1994, 2001; CaTiO 3 -La 2/3 TiO 3 : Zhang et al 2007;SrSnO 3 : Glerup et al 2005, Mountstevens et al 2005 and probably has a stability field which is never very far from that of the I 4/mcm or R3c structures.…”

Section: Comparison With the (Casr)tio 3 Solid Solution Seriesmentioning

confidence: 97%

Elastic anomalies associated with transformation sequences in perovskites: II. The strontium zirconate–titanate Sr(Zr,Ti)O₃solid solution series

McKnight

Kennedy

Zhou

et al. 2008

J. Phys.: Condens. Matter

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The sequence of phase transitions due to octahedral tilting across the Sr(Zr,Ti)O 3 solid solution series has been investigated by resonant ultrasound spectroscopy at high and low temperatures using ceramic samples. The elastic behaviour associated with phase transitions as a function of composition in Sr(Zr,Ti)O 3 at room temperature is proposed to be analogous to that as a function of temperature in what is assumed to be I mma, appear to have stability fields across the full compositional range and both show large dissipation effects, most probably due to twin wall mobility. In contrast, the Zr-rich Pnma phase, which should contain transformation twin walls, is an unexpectedly stiff and non-dissipating material, similar to the high temperature and/or Ti-rich Pm3m phase. In the case of Pnma, this is attributed to coupling between the two order parameters, which could impede relaxation responses to an applied stress. The Pm3m structure is a classically stiff cubic perovskite and no transformation-related dissipation processes are expected.

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“…The result was unexpected: the rate of oxygen release was practically zero (i.e. of background's level) up to the temperature of the cubic-tetragonal phase transition at =1100 -1200 K (according to different data for different samples [20][21][22] ( Fig. 4).…”

mentioning

confidence: 99%

“…Generally speaking, the structural changes in BaCeO 3 have been explained by the changes in the octahedra orientation (12,20,21), but are undoubtedly linked with electronic features, mainly by the behavior of cerium. Accor-dingly, oxygen release can be explained only as redox reaction, such as O~) +2Cede r VO + 2Cece +10 2…”

mentioning

confidence: 99%

Well-known perovskites (cerates, cuprates, manganates): Problems and facts; A review of nontraditional approaches

Baikova

Kompan

Nikulin

et al. 2003

Ionics

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Abstract. Phenomena and processes either new or not studied in-depth occurring in perovskite oxides and in systems which contain these compounds are reported and summarized. The materials under consideration are well-known for specific properties, e.g., cerates of alkaline earths are hightemperature proton conductors, manganates are electrode materials of SOFCs and show the effect of colossal magnetoresistance or YBazCu307 cuprates YBa~Cu307 are "high-temperature" superconductors. The presented nontraditional approach consists of considering physical and chemical phenomena and processes, which do not relate to the indicated main properties of the compounds. For instance, BaCeO3 undoped and slightly doped has partially cerium in the form of Ce +3, which provides the effect of blue luminescence which is controlled by thermochemical treatment; H2YBazCu307 manifests mixed proton-electron conduction at 400-550 K under water vapor of 100-300 Pa; La0.67Cao,33MnO2.84 can dissolve some part of water vapor as this occurs in traditional HTPC. The electrochemical cells Pd I HTPC I hydrocuprate I HTPC I Pd and the more simple one Pd I HTPC I Pd show e.m.f, values near I V under certain conditions after polarization by d.c. currents at 420-520 K under different atmospheres. The system water vapor -membrane of undoped BaCeO3-hydride is described. Defect chemistry equations are used to describe some of the phenomena which are employed for the production and storage of pure hydrogen.

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Phase transitions in BaCeO3: neutron diffraction and Raman studies

Cited by 83 publications

References 15 publications

Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO₃

Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO₃

Elastic anomalies associated with transformation sequences in perovskites: II. The strontium zirconate–titanate Sr(Zr,Ti)O₃solid solution series

Well-known perovskites (cerates, cuprates, manganates): Problems and facts; A review of nontraditional approaches

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Phase transitions in BaCeO3: neutron diffraction and Raman studies

Cited by 83 publications

References 15 publications

Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO3

Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO3

Elastic anomalies associated with transformation sequences in perovskites: II. The strontium zirconate–titanate Sr(Zr,Ti)O3solid solution series

Well-known perovskites (cerates, cuprates, manganates): Problems and facts; A review of nontraditional approaches

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Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO₃

Force constant calculation from Raman and IR spectra in the three non‐cubic phases of BaCeO₃

Elastic anomalies associated with transformation sequences in perovskites: II. The strontium zirconate–titanate Sr(Zr,Ti)O₃solid solution series