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

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Science  27 Nov 1964:
Vol. 146, Issue 3648, pp. 1163-1164
DOI: 10.1126/science.146.3648.1163


New high pressure forms of the sesquioxides of holminum, 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).