Neodymium-doped yttrium aluminium nanopowders with nominal Nd:Y:Al ratio equal to X:3-X:5 (where X = 0, 0.006, 0.012, 0.024, 0.048, 0.081, 0.096, 0.171, 0.192, 0.384, 0.540 and 0.720) were prepared by the co-precipitation method and subjected to five cumulative stages of isothermal treatment in the temperature range from 900 to 1050 °C. The phase evolution of the oxides were investigated quantitatively by the X-ray powder diffraction approach using the Rietveld method of analysis. An almost single phase cubic garnet structure was attained at temperatures as low as 900 °C for specimens with neodymium loading less than ca. 6 at.% with respect to total (Nd + Y) atoms. Isothermal treatments of the powders up to 1050 °C remove the hexagonal YAlO3 metastable phase and maximize the amount of the garnet phase. However, for neodymium loading higher than ca. 6 at.%, the garnet structure remains substantially affected by the presence of monoclinic Y4Al2O9 and orthorhombic distorted perovskite-like YAlO3 phases.

CAPONETTI E, ENZO S, LASIO B, SALADINO ML (2007). Co-precipitation synthesis of neodymium-doped yttrium aluminium oxides nanopowders: quantitative phase investigation as a function of joint isothermal treatment conditions and neodymium content. OPTICAL MATERIALS, 29, 1240-1243 [10.1016/j.optmat.2005.11.037].

Co-precipitation synthesis of neodymium-doped yttrium aluminium oxides nanopowders: quantitative phase investigation as a function of joint isothermal treatment conditions and neodymium content.

CAPONETTI, Eugenio;SALADINO, Maria Luisa
2007-01-01

Abstract

Neodymium-doped yttrium aluminium nanopowders with nominal Nd:Y:Al ratio equal to X:3-X:5 (where X = 0, 0.006, 0.012, 0.024, 0.048, 0.081, 0.096, 0.171, 0.192, 0.384, 0.540 and 0.720) were prepared by the co-precipitation method and subjected to five cumulative stages of isothermal treatment in the temperature range from 900 to 1050 °C. The phase evolution of the oxides were investigated quantitatively by the X-ray powder diffraction approach using the Rietveld method of analysis. An almost single phase cubic garnet structure was attained at temperatures as low as 900 °C for specimens with neodymium loading less than ca. 6 at.% with respect to total (Nd + Y) atoms. Isothermal treatments of the powders up to 1050 °C remove the hexagonal YAlO3 metastable phase and maximize the amount of the garnet phase. However, for neodymium loading higher than ca. 6 at.%, the garnet structure remains substantially affected by the presence of monoclinic Y4Al2O9 and orthorhombic distorted perovskite-like YAlO3 phases.
2007
Settore CHIM/02 - Chimica Fisica
CAPONETTI E, ENZO S, LASIO B, SALADINO ML (2007). Co-precipitation synthesis of neodymium-doped yttrium aluminium oxides nanopowders: quantitative phase investigation as a function of joint isothermal treatment conditions and neodymium content. OPTICAL MATERIALS, 29, 1240-1243 [10.1016/j.optmat.2005.11.037].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/10075
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