Doping behaviors of NiO and Nb2O5 in BaTiO3 and dielectric properties of BaTiO3-based X7R ceramics

The dielectric properties and microstructure of BaTiO3 ceramics with ZnO–Nb2O5 composite addition

“…When ZnNb 2 O 6 was doped into BT, the Zn 2þ and Nb 5þ ions would substitute the Ti 4þ through forming the composite cation of ðZn 2þ 1=3 Nb 5þ 2=3 Þ 4þ due to the similar ionic radius to that of Ti 4þ , rather than the doping behaviours simply as accepter (Zn 2þ ) or donor (Nb 5þ ). So, this is very similar to the doping behaviour of composite formed by Ni 2þ and Nb 5þ in BT ceramics [17]. Furthermore, the valence of the composite cation of ðZn 2þ 1=3 Nb 5þ 2=3 Þ 4þ was equal to Ti 4þ .…”

The relationship between the micro-mechanism and macroscopic dielectric properties in Ba 1−x Bi x Ti 1−x−y Zn 0.75x W 0.25x+y O 3+y systems

“…Few dielectric materials own a temperature stability from a relative lower temperature to a higher temperature (such as À 30 to 375°C) [13][14][15][16][17][18][19]. In this paper, we reported a novel ceramics system Ba 1À x Bi x Ti 1À xÀ y Zn 0.75x W 0.25x þ y O 3 þ y .…”

Temperature stability, structural evolution and dielectric properties of BaTiO3–Bi(Mg2/3Ta1/3)O3 perovskite ceramics

“…Nevertheless, BT ceramics have three phase transitions at about 125 o C, 0 o C, and -90 o C, leading to three dielectric anomalies, which restricts the applications of BT in the electronic information manufacturing industry [4]. To solve the above mentioned problem, a number of BaTiO 3 -based solid solutions [5][6][7][8][9][10][11][12][13][14] have been researched owing to their high relative permittivity and good temperature-stability, especially for the addition of Bibased [general formula-Bi(Me)O 3 ] perovskite materials to BaTiO 3 , such as BaTiO 3 -Bi(Mg 0.5 Zr 0.5 )O 3 [6,7], BaTiO 3 -Bi(Zn 0.5 Zr 0.5 )O 3 [15], BaTiO 3 -Bi(Li 1/3 Ti i2/3 )O 3 [16], BaTiO 3 -BiScO 3 [17,18], and BaTiO 3 -Bi(Mg 0.5 Ti 0.5 )O 3 [19,20]. These ceramics show a common phenomenon that the curves of dielectric constant as a function of temperature (ε-T) flatten gradually with increasing the Bi(Me)O 3 content, which is highly attractive for MLCC applications.…”