PTCR behaviour of Ba2LaBiO6-doped BaTiO3 ceramics

Luo, Ying; Liu, Xinyu; Li, Xvqiong; Cheng, Jinrong

doi:10.1016/j.jallcom.2006.11.011

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…It is well known that barium titanate (BaTiO 3 , BT) ceramics sintered in air can be converted into a semiconductor by doping with a donor such as La 3+ , Nb 5+ or Dy 3+ and that such a doped BaTiO 3 semiconductor exhibits positive temperature coefficient of resistivity (PTCR) characteristics [1,2]. Near the ferroelectric transition temperature (Tc) donor-doped BaTiO 3 ceramics show an anomalous increase in resistivity.…”

Section: Introductionmentioning

confidence: 99%

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO₃-Based PTCR Ceramics

Wei

Mao

et al. 2010

Ferroelectrics

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Lanthanum (La) doped BaTiO 3 -(Bi 0.5 Na 0.5 )TiO 3 (BT-BNT) positive temperature coefficient of resistivity (PTCR) ceramics were prepared by a conventional solid state reaction method. The microstructure and PTCR effect of BT-BNT ceramics were investigated by scanning electron microscopy and measurement of resistivity-temperature dependence. The BT-BNT ceramics sintered in a N 2 gas flow possessed low room-temperature resistivity (ρ RT < 10 2 ·cm) and PTCR effect wasn't remarkable (ρ max /ρ min < 10); through a proper reoxidation process, the ceramics showed a typical PTCR effect (ρ max /ρ min > 10 3 ) but with a high room-temperature resistivity (ρ RT > 10 3 ·cm). Room-temperature resistivity increased with the raising content of BNT. The Curie temperature (Tc) of BT-BNT ceramics shifted to 160 • C for the 8mol% BNT added. With the addition of 4mol% BNT, the obtained BT-BNT ceramics reoxidized at 950 • C possessed ρ RT = 10 3 ·cm and exhibited a resistivity jump (ρ max /ρ min > 10 3 ) at 150 • C. The possible mechanism underlying the PTCR behavior in BT-BNT ceramics was discussed.

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Section: Introductionmentioning

confidence: 99%

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO₃-Based PTCR Ceramics

Wei

Mao

et al. 2010

Ferroelectrics

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“…The average grain sizes increased from 0.85 µmto 2.98 µmwith an increase in the doping concentration from x=0.0 to 0.002. In contrast, a further increase in the dopant concentration to x = 0.004 lead to a reduction in the grain size to 2.4 µm.The fast decrease in the grain size when x > 0.002 might be related to thesolute drag effect of segregated La impurities on the grain boundary mobility, as it has been reported for many other doped BaTiO 3 ceramics [4][5][6]. In ceramic systems such as barium titanate, the relaxation frequency of the electrical impedance of the grain boundary is distinct from that of the grain.…”

Section: Resultsmentioning

confidence: 60%

Effects of La Doping on the Structural and Dielectric Properties of Barium Titanate Ceramics

Silva¹,

Ferreira

2014

AMR

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Polycrystalline samples of Ba1-xLaxTiO3 (x = 0.0, 0.002, 0.004) were prepared by a standard high-temperature solid-state reaction method. XRD studies confirmed the formation of a polycrystalline compound with a tetragonal crystal structure. SEM images suggested the presence of a polycrystalline microstructure with certain degree of porosity, and the grains appeared to be distributed inhomogeneously throughout the pallet samples. Dielectric studies indicated a ferroelectric–paraelectric phase transition with a clear shift in the Curie temperature (Tc) of BaTiO3 towards a lower temperature upon doping. The brick-layer model was used to study the potential barrier and the structure of the grain-boundary region of the Ba9.998La0.002TiO3 and Ba9.996La0.004TiO3 ceramics. These ceramics exhibited good density and a homogeneous distribution of the grains. The thickness of the grain-boundary region was calculated to be approximately 200 nm.

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“…More recently Jonker extended this model by considering the influence of the polarization on the resistivity below T C . Several studies were carried out on the appearance of PTCR effect about the doped BaTiO 3 with Ba 2 LaBiO 6 , Y or Er 3+ [11][12][13] but no study is found about a BaTiO 3 -BaF 2 -LiF system. In our case, the appearance of the semi conduction is probably du to an excess of BaF 2 , wich leads at donor levels within this ceramics.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of (1-x)BaTiO₃-xBaF₂-xLiF Ceramics

Talantikite-Touati

Benziada

2012

Ferroelectrics

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Oxyfluoride phases have been synthesized in free atmosphere at 950 • C during 4 hours, using the BaTiO 3 perovskite and the fluorides BaF 2 and LiF. The XRD study at room temperature on powder, for various compositions has shown the formation of a new solid solution (1-x)BaTiO 3 -xBaF 2 -xLiF in the range 0 < x ≤ 0.15. Furthermore the XRD analysis indicates the transition of crystalline type from tetragonal to cubic symmetry from the composition x = 0.035. This result can be attributed to the decrease of the covalency bonds in the BX 6 . An electric measurement have showed a PTCR behavior for two compositions, 0.90BaTiO 3 -0.10BaF 2 -0.10LiF and 0.85BaTiO 3 -0.15BaF 2 -0.15LiF.

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PTCR behaviour of Ba2LaBiO6-doped BaTiO3 ceramics

Cited by 12 publications

References 16 publications

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO₃-Based PTCR Ceramics

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO₃-Based PTCR Ceramics

Effects of La Doping on the Structural and Dielectric Properties of Barium Titanate Ceramics

Synthesis and Characterization of (1-x)BaTiO₃-xBaF₂-xLiF Ceramics

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PTCR behaviour of Ba2LaBiO6-doped BaTiO3 ceramics

Cited by 12 publications

References 16 publications

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO3-Based PTCR Ceramics

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO3-Based PTCR Ceramics

Effects of La Doping on the Structural and Dielectric Properties of Barium Titanate Ceramics

Synthesis and Characterization of (1-x)BaTiO3-xBaF2-xLiF Ceramics

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Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO₃-Based PTCR Ceramics

Effects of BNT Addition on the Microstructure and PTC Properties of La-Doped BaTiO₃-Based PTCR Ceramics

Synthesis and Characterization of (1-x)BaTiO₃-xBaF₂-xLiF Ceramics