Synthesis and Microstructure Characterization of Gd- and Sc-Co-Doped BaTiO₃ Nanopowders via Sol-Gel Method

Abstract:

The effects of rare-earth ions Sc³⁺ and Gd³⁺ on phase transition, microstructure and dielectric properties were investigated systematically. Gd-and Sc-co-doped nanopowders were synthesized via one-step sol-gel method. After xerogel was calcined at 800 °C for 2h, (1x)BaTiO₃-xGdScO₃ (0 x 0.06) nanopowders with narrow particle distribution was obtained. The nanopowders were then pressed into pellets and sintered at 1300~1450 °C respectively. The results indicated that the dielectric peaks of samples were broadened since double doping restrained the grain growth of BaTiO₃ ceramics. For x = 0.06, pellets sintered at different temperatures can obtain a low curie temperature of 25 °C. Meanwhile, accompanied by an increasing sintering temperature, the dielectric loss of samples decreased gradually, achieving a optimal value of 1.1%.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 689-694
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.689
• Online since: March 2014
• Authors: Dan Yu, Qi Long Zhang*, Hui Yang, Jue Hui Zhou
• Keywords: BaTiO₃, Co-Doped, Nanopowder, Sol-Gel

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