アモルファスクエン酸錯体法によるガーネット型Gd_3Al_5O_<12>粉末の調製

概要

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Powders of garnet-type Gd_3Al_5O_<12>, which have not been prepared, were obtained by an amorphous citrate process. A precursor gel was prepared by dehydration of sol which was obtained by heating a mixture of gadolinium nitrate and aluminum nitrate gently with citric acid. The decomposition process of the precursor was analyzed using TG-DTA and FT-IR. The precursor gel was heated at 1000℃ for 30 min in air to remove organic compounds, then heated at 1100° to 1600℃ for 2 h in air. Single phased garnet-type Gd_3Al_5O_<12> powders were obtained by heating only at 1400℃ for 2 h under the experimental conditions examined. Perovskite-type GdAlO_3 was obtained by heating below 1400℃. At 1600℃, the garnet decomposed into GdAlO_3 and Al_2O_3. The crystallite size and the lattice constant of the Gd_3Al_5O_<12> single-phase powder were 30 nm and 1.2107 nm, respectively.
社団法人日本セラミックス協会の論文
1992-11-01