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Effect of glycine on solid-state synthesis of barium titanate powder
Received date: 2022-09-15
Online published: 2023-07-13
Barium titanate（BT） powders were synthesized by solid-state reaction using BaCO3 and TiO2 as raw materials and glycine as additive.The effects of different synthesis temperatures and glycine addition on the properties of BT powder were studied.The synthesized BT powders were characterized by XRD，BET，SEM，DSC and TG.The results showed that the addition of glycine could promote the decomposition of BaCO3 near 650 ℃ and reduce the synthesis temperature of BT powder by 50 ℃.After adding glycine，pure phase BT could be obtained at 900 ℃，and BT powder with c/a>1.010 could be obtained at 1 000 ℃.However，the addition of excessive glycine made the particle size increase sharply，which would deteriorate the performance of BT powder.The BT powder with c/a=1.010 3，average particle size of 520 nm and k=9.00 could be obtained by adding 15% glycine at 1 000 ℃ for 2 h，and its performance was better than that of commercial BT powder with 600 nm.BT ceramics were obtained by sintering commercial powder and synthetic powder with 15% glycine at 1 280 ℃，respectively.Comparing the dielectric properties of the two ceramics，it was found that the dielectric constants of the former at room temperature and Curie point were slightly larger than those of the latter，but the dielectric loss was increased obviously due to the orthorhombic-tetragonal phase transition peak at room temperature.
Key words： BaTiO3; glycine; tetragonality; k-factor; dielectric properties
LI Xuemei , HUANG Fuxiang , LONG Min , TIAN Zhongqing , MENG Fancheng , LUO Xiaoyang . Effect of glycine on solid-state synthesis of barium titanate powder[J]. Inorganic Chemicals Industry, 2023 , 55(7) : 65 -69 . DOI: 10.19964/j.issn.1006-4990.2022-0559
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