Comparative studies of nickel doping effects at A and B sites of BaTiO3 ceramics on their crystal structures and dielectric and ferroelectric properties

作者：Fu, Chenjie; Chen, Nan; Du, Guoping^*

来源：Ceramics International, 2017, 43(17): 15927-15931.

DOI：10.1016/j.ceramint.2017.08.169

• BaTiO3 ceramic
• Ni2+ doping
• Crystal structure
• Dielectric property
• Ferroelectric property

Effects of Ni2+ doping at A and B sites of BaTiO3 ceramics on the crystal structures, microstructures, chemical bonding characteristics and dielectric and ferroelectric properties were studied. Both the A-site doped Ba1-xNixTiO3 and B-site doped BaTi1-xNixO3 ceramics (x = 0, 0.01, 0.03, 0.05, 0.08 and 0.10) were prepared using the solid state reaction method at 1300 degrees C. For Ni2+ doping at A sites, no change in the crystal structure of Ba1-xNixTiO3 was observed. The Ba1-xNixTiO3 ceramics remained to be of tetragonal structure, but their tetragonality consistently decreased with x. For Ni2+ doping at B sites, a change in the crystal structure from tetragonal to hexagonal was observed for the BaTi1-xNixO3 ceramics. The hexagonal structure started to appear when x = 0.03, and BaTi1-xNixO3 ceramics completely transformed from tetragonal to hexagonal structure when x=0.08. Ni2+ doping introduced more oxygen vacancies to Ba1-xNixTiO3 and BaTi1-xNixO3, and the latter had higher concentration of oxygen vacancies. It was found that Ni2+ doping, either at A or B sites, strongly decreased their dielectric and ferroelectric properties. The Ba1-xNixTiO3 ceramics remained to be ferroelectric for x up to 0.10, although it was weak, while the BaTi1-xNixO3 ceramics became paraelectric when x = 0.03. The Ba1-xNixTiO3 ceramics exhibited higher dielectric constant than the BaTi1-xNixO3.

• 出版日期2017-12-1
• 单位南昌大学