POLYMORPHISM OF THE RARE EARTH SESQUIOXIDES<sup>1</sup>

Warshaw, I.; Roy, Rustum

doi:10.1021/j100828a030

Cited by 177 publications

(68 citation statements)

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“…27,28 Additional reaction components can also help to transform the sesquioxides during the temperature treatment. For example, Foex et al achieved a transformation from the C-type to the B-type structure by adding some lime, 29 or by offering support with oxides like CaO and SrO.…”

Section: A Discussionmentioning

confidence: 99%

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Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Pandey

Samanta

Singh

et al. 2014

Journal of Applied Physics

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Pressure and temperature dependent Raman scattering studies on Ho2O3 have been carried out to investigate the structural transition and the anharmonic behavior of the phonons. Ho2O3 undergoes a transition from cubic to monoclinic phase above 15.5 GPa, which is partially reversible on decompression. The anharmonic behavior of the phonon modes of Ho2O3 from 80 K to 440 K has been investigated. We find an anomalous line-width change with temperature. The mode Grüneisen parameter of bulk Ho2O3 was estimated from high pressure Raman investigation up to 29 GPa. Furthermore, the anharmonic components were calculated from the temperature dependent Raman scattering.

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Section: A Discussionmentioning

confidence: 99%

“…However, the peaks observed between 600-700 cm À1 are seen to gain intensity from pressures as low as 5.5 GPa. In fact at the highest studied pressure of about 28…”

Section: High Pressure Behaviormentioning

confidence: 94%

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Pandey

Samanta

Singh

et al. 2014

Journal of Applied Physics

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“…Par exemple, la Ceci peut s'expliquer en 6tudiant le diagramme d'existence des diff6rentes phases des sesquioxydes de terres rares (Warshaw & Roy, 1961 ;FoEx & Traverse, 1966). A l'6tat massif, le premier oxyde de terre rare pr6sen-tant la structure B est l'oxyde de prom6thium (num6ro atomique 61).…”

Section: (B) Stabilitdunclassified

“…Les domaines d'existence des formes A (hexagonale), B (monoclinique) et C (cubique centr6e) des sesquioxydes de terres rares ont 6t6 d6finies avec pr6cision par divers auteurs (voir, par exemple, Warshaw & Roy, 1961 ;Fo~x et Traverse, 1966). Le sesquioxyde de n6o-dyme ne pr6sente, 5-la pression normale, que les phases C (basse temp6rature) et A (haute temp6rature).…”

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Microscopie et diffraction électroniques de couches minces de sesquioxyde de néodyme. La transformation de caractère martensitique phase monoclinique–phase hexagonale

Boulesteix¹,

E.²,

Gasgnier³

et al. 1971

Acta Cryst Sect A

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Thin films of neodymium metal are oxidized at low temperature into C-type Nd203. Under the electronbeam impact in the electron microscope, C-Nd203 recrystallizes to yield large crystals of the high temperature phase hexagonal A-NdzOa. The plane of the thin A-Nd203 films is perpendicular to the c-hexagonal axis. In analogy with previous work on B-SmzO3 thin films, the plane of the film is then parallel to the basal plane of the (LnO)~, + (Ln = rare earth) complex group in the A structure. A special treatment of the films allows the formation of thin bands of B-Nd203 structure in the A-Nd203 crystals. The two structures are in epitaxic continuity which is sometimes attained with the help of the same type of twinning as observed previously for B-Sm203. B-Nd203 bands disappear within minutes after formation and the B to A transformation exhibits a martensitic character.

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Mesoporöse magnetische Materialien auf Seltenerdoxidbasis

et al. 1999

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Abbildung 2. TEM-Bilder von direkt erhaltenen (a, b) und acetatbehandelten (c, d) mesostrukturierten Erbiumoxiden, die nach Reaktionszeiten von 3 (a), 10 (b, d) und 20 h (c) isoliert wurden. durch die Streifen einer Schichtstruktur sichtbar gemacht wurden, und der Rasterelektronenmikroskopie, die die Bildung von Lamellenpartikeln anzeigt. Die gekrümmten Streifen und konzentrischen Muster sind in Einklang mit der Gegenwart von geschichteten Seltenerd-Mesophasen. Diese spezifischen Muster sind denen ähnlich, die für Yttriumoxid/ Detergens- [13] und Aluminiumphosphat/Detergens-Systeme [16] beobachtet wurden, aber vollkommen verschieden [**] Diese Arbeit wurde durch ein Stipendium zur Förderung junger Wissenschaftler des japanischen Ministeriums für Bildung, Wissenschaft, Sport und Kultur unterstützt. Abbildung 1. XRD-Muster von direkt erhaltenen (a, b) und acetatbehandelten Proben (c) mesostrukturierter Erbiumoxide, die nach Reaktionszeiten von 3 (a) und 10 h (b, c) isoliert wurden.

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POLYMORPHISM OF THE RARE EARTH SESQUIOXIDES¹

Cited by 177 publications

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Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Microscopie et diffraction électroniques de couches minces de sesquioxyde de néodyme. La transformation de caractère martensitique phase monoclinique–phase hexagonale

Mesoporöse magnetische Materialien auf Seltenerdoxidbasis

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POLYMORPHISM OF THE RARE EARTH SESQUIOXIDES1

Cited by 177 publications

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Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Microscopie et diffraction électroniques de couches minces de sesquioxyde de néodyme. La transformation de caractère martensitique phase monoclinique–phase hexagonale

Mesoporöse magnetische Materialien auf Seltenerdoxidbasis

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POLYMORPHISM OF THE RARE EARTH SESQUIOXIDES¹