High-Pressure B-Type Polymorphs of Some Rare-Earth Sesquioxides

New high pressure forms of the sesquioxides of holmium, erbium, thulium, ytterbium, lutetium, and yttrium have been obtained by exposure of the C-type sesquioxides to pressures between 25 and 40 kilobars and temperatures between 900° and 1020° C. X-ray diffraction analysis shows that these new high-...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1964-11, Vol.146 (3648), p.1163-1164
Hauptverfasser:	Hoekstra, Henry R., Gingerich, Karl A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Air pressure ALLOTROPY CHEMISTRY Crystals DIFFRACTION Dysprosium ERBIUM OXIDES Europium Gadolinium High pressure HIGH TEMPERATURE HOLMIUM OXIDES Inorganic and Physical Chemistry IRRADIATION LATTICES LUTETIUM OXIDES OXIDES PRESSURE RARE EARTHS Thulium THULIUM OXIDES X RADIATION Ytterbium YTTERBIUM OXIDES Yttrium YTTRIUM OXIDES
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Beschreibung
Zusammenfassung:	New high pressure forms of the sesquioxides of holmium, erbium, thulium, ytterbium, lutetium, and yttrium have been obtained by exposure of the C-type sesquioxides to pressures between 25 and 40 kilobars and temperatures between 900° and 1020° C. X-ray diffraction analysis shows that these new high-pressure phases are of the monoclinic B-type which is known for several of the lighter rare-earth sesquioxides (samarium through dysprosium).
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.146.3648.1163