Hydrothermal Synthesis and Characterization of Pyrochlore Titanate R2Ti2O7(R=Gd3+, Tb3+, Dy3+)

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (2): 161-165.

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Hydrothermal Synthesis and Characterization of Pyrochlore Titanate R₂Ti₂O₇(R=Gd³⁺, Tb³⁺, Dy³⁺)

PENG Wen, HU Bin, CHEN Yan, HU Wei-wei, GUO Li, YUAN Hong-ming* and FENG Shou-hua

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received:2010-07-01 Revised:2010-10-18 Online:2011-03-25 Published:2011-03-09
Contact: YUAN Hong-ming E-mail:hmyuan@mail.jlu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.90922034, 20771042).

Abstract

Abstract: Pyrochlore titanate oxides, R2Ti2O7(R=Gd3+, Tb3+, Dy3+), were synthesized under mild hydrothermal conditions. The crystal growth of pyrochlore titanate oxides and taking place of chemical reaction in the hydrothermal processing were sensitive to the alkalinity, temperature, reaction time, the nature of the rare earth ion and the composition of initial reaction mixture. The as-prepared samples were characterized by powder X-ray diffraction, scanning electron microscopy, Raman spectrum and variable temperature dc magnetic susceptibility(SQUIDS). The magnetic studies gave 7.29×10–23 A•m2/Gd3+ and –8.28 K, 8.75×10–23 A•m2 /Tb3+ and –19.7 K, and 8.85×10–23 A•m2/Dy3+ and 0.84 K effective moments and Weiss constants for Gd2Ti2O7, Tb2Ti2O7 and Dy2Ti2O7, respectively.

Key words: Pyrochlore, Titanate, Hydrothermal

PENG Wen, HU Bin, CHEN Yan, HU Wei-wei, GUO Li, YUAN Hong-ming* and FENG Shou-hua. Hydrothermal Synthesis and Characterization of Pyrochlore Titanate R₂Ti₂O₇(R=Gd³⁺, Tb³⁺, Dy³⁺)[J]. Chemical Research in Chinese Universities, 2011, 27(2): 161-165.

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Hydrothermal Synthesis and Characterization of Pyrochlore Titanate R₂Ti₂O₇(R=Gd³⁺, Tb³⁺, Dy³⁺)

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