Reference

Structural changes produced by plasma processing of rare earth oxides

Structural changes produced by plasma processing of rare earth oxides. McPherson, R. (Dep. Mater. Eng. 1308-96-9 and 1308-87-8 are also occured in this study., Monash Univ., Clayton 3168, Australia). Symp. Proc. - Int. Symp. Plasma Chem., 6th, Volume 2, 387-387d. Edited by: Boulos, M. I.; Munz, R. J. McGill Univ.: Montreal, Que. (English) 1983. CODEN: 51FLAS. DOCUMENT TYPE: Conference CA Section: 75 (Crystallography and Liquid Crystals) The crystal structure was studied of a no. of rare earth oxides in the form of plasma-sprayed coatings. Many oxides consist entirely of the metastable monoclinic form or a mixt. of monoclinic and the stable cubic forms. In certain cases the formation of the monoclinic phase is simply a result of suppression of the monoclinic-to-cubic phase transformation, but in others monoclinic is metastable at all temps. and its formation must be a function of the liq.-to-crystal nucleation kinetics. .

Lanthanide oxides: preparation and aging

Lanthanide oxides: preparation and aging. Alvero, Rafael; Odriozola, Jose A.; Trillo, Jose M.; Bernal, Serafin (Dep. Inorg. Chem., Univ. Seville, Seville, Spain). J. Chem. Soc., Dalton Trans., (1), 87-91, 2 plates (English) 1984. CODEN: JCDTBI. ISSN: 0300-9246. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 67 La2O3, CeO2, Sm2O3, Dy2O3, and Yb2O3 were prepd. by calcination in air of NH3-pptd. phases from solns. of the corresponding nitrates. Under the exptl. calcination conditions used, the extent of removal of NO3- ions could not be detected by either temp.-programmed desorption-mass spectrometry or IR spectrometry, contrary to previous reports. Yb2O3 was also prepd. by calcination of the oxalate: the Brunauer-Emmett-Teller surface area of Yb2O3 prepd. in this way was always lower than that prepd. from the nitrate, even after thermal treatment at 1173 K. Independent of the prepn. method, the heaviest 4f oxides were partially converted to bulk carbonate hydroxides by exposure to air. 1308-87-8 and 1314-37-0 are just another two chemicals used in this study. Lanthanide oxides for use as catalysts are often activated at temps. lower than required for complete elimination of CO2 and H2O. .