Fabrication of High Tc BaTiO3-(Bi0.5Na0.5)TiO3 Lead-free Positive Temperature Coefficient of Resistivity Ceramics

doi:10.15541/jim20140568

Abstract

Abstract:

High curie temperature (T_c) (1-xmol%)BaTiO₃-xmol%(Bi_0.5Na_0.5)TiO₃(BBNTx) lead-free positive temperature coefficient of resistivity(PTCR) ceramics were prepared by the conventional solid state reaction sintering method. XRD patterns showed that all BBNTx samples had a single tetragonal phase perovskite structure. The SEM results showed that as the content of BNT increased from 1mol% to 60mol%, the average grain size monotonously decreased. The 0.2mol% Nb-doped BBNT1 ceramic sintered in air had low room-temperature resistivity (ρ₂₅) of ~10²Ω·cm and high resistivity jump (maximum resistivity [ρ_max]/minimum resistivity [ρ_min]) of ~4.5 orders of magnitude with T_c at about 150℃. The 0.3mol% Nb-doped BBNTx(10≤x≤60) ceramics, sintered in N₂, also showed distinct PTCR effect with T_cbetween 180℃ and 235℃. As the BNT content increased, the ρ₂₅ of the BBNTx rapidly increased with the resistivity jump decrease.

Key words: BaTiO3-(Bi0.5Na0.5)TiO3, lead-free, positive temperature coefficient of resistivity, fabrication

CLC Number:

TQ174

LENG Sen-Lin, JIA Fei-Hu, ZHONG Zhi-Kun, YANG Qin-Fang, LI Guo-Rong, ZHENG Liao-Ying. Fabrication of High T_c BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Lead-free Positive Temperature Coefficient of Resistivity Ceramics[J]. Journal of Inorganic Materials, 2015, 30(6): 576-580.

Figures/Tables 5

Fig. 1 XRD patterns of Nb2O5 doped BBNTx (x=1, 10, 20, 40, 60) ceramics

Fig. 2 SEM images of the sintered surfaces of Nb2O5 doped BBNTx(x=1, 10, 20, 60) ceramics

Fig. 3 Resistivity-temperature characteristics of the BBNT1 ceramics doping different donors

Fig. 4 Influences of excess TiO2 on the resistivity-temperature characteristics of Nb2O5 doped BBNT1 ceramics

Fig. 5 Resistivity-temperature characteristics of Nb2O5 doped BBNTx(x=10, 20, 30, 40, 50, 60) ceramics

References 18

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Fabrication of High T_c BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Lead-free Positive Temperature Coefficient of Resistivity Ceramics

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