Effect of doping method on microstructural and defect profile of Sb–BaTiO3

Brzozowski, E.; Caballero, A. C.; Villegas, M.; Castro, Miriam Susana; Fernández, J.F.

doi:10.1016/j.jeurceramsoc.2005.04.017

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…However, very high room-temperature resistivities and poor PTCR jumps were observed in materials prepared by such method compared with the conventional solid state reaction route. [85][86][87][88] A similar phenomenon was observed for donor-doped BaTiO3 prepared by mixing the dopant salt into BaTiO3 powder via solution coating method; 89 in addition, PTCR ceramics prepared by this doping method has lower critical concentration of donor compared with the same compositional system prepared by the solid state route. 89 Besides the different doping methods which cause disparities in PTCR behaviour as described above, a variety of unique mixing techniques have been investigated in order to obtain a controllable, microstructurally stable, BaTiO3-based PTCR material.…”

Section: A Effect Of Doping Methodssupporting

confidence: 56%

“…However, very high room temperature resistivities and poor PTCR jumps were observed in materials prepared by such method compared with the conventional solid state reaction route 85 – 88. A similar phenomenon was observed for donor doped BaTiO 3 prepared by mixing the dopant salt into BaTiO 3 powder via solution coating method;89 in addition, PTCR ceramics prepared by this doping method have lower critical concentration of donor compared with the same compositional system prepared by the solid state route 89…”

Section: Effect Of Processing On Ptcr Propertiesmentioning

confidence: 73%

“…[85][86][87][88] A similar phenomenon was observed for donor doped BaTiO 3 prepared by mixing the dopant salt into BaTiO 3 powder via solution coating method; 89 in addition, PTCR ceramics prepared by this doping method have lower critical concentration of donor compared with the same compositional system prepared by the solid state route. 89 Besides the different doping methods which cause disparities in PTCR behaviour as described above, a variety of unique mixing techniques have been investigated in order to obtain a controllable, microstructurally stable, BaTiO 3 based PTCR material. Mukherjee et al 90 made a donor doped BaTiO 3 system by blending Ba excess BaTiO 3 powder with Ti excess BaTiO 3 powder in different ratios, finding that these blended systems had homogeneous grain size distribution but lower PTCR jumps than those from stoichiometric non-blended batches.…”

Section: Effect Of Doping Methodsmentioning

confidence: 99%

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PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties

Chen

Yang

2011

Advances in Applied Ceramics

104

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Barium titanate is widely used in the fabrication of thermistors with a positive temperature coefficient of resistivity (PTCR). The resistivity can increase by several orders of magnitude near the phase transition temperature (Tc) for the ferroelectric tetragonal to the paraelectric cubic phase transformation. There is general agreement that the anomaly in the change of electrical resistivity of donor-doped BaTiO3 around Tc is due to the grain boundary effect. The Heywang-Jonker model and other mechanisms involving the nature of the electrical barrier formed across the grain boundaries of polycrystalline BaTiO3 are reviewed. The compositional effect on BaTiO3-based PTCR properties is listed and discussed. The influences of manufacturing methods under different stages including the initial doping methods, sample forming methods and final heat treatments on PTCR properties are compared. The complex interrelationship between compositions, microstructures, processing and PTCR characteristics are well discussed.

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Section: A Effect Of Doping Methodssupporting

confidence: 56%

Section: Effect Of Processing On Ptcr Propertiesmentioning

confidence: 73%

Section: Effect Of Doping Methodsmentioning

confidence: 99%

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PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties

Chen

Yang

2011

Advances in Applied Ceramics

104

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“…The evolution of the peak from a tetragonal structure splitting into two peaks in undoped material to a pseudo‐cubic structure with a single peak merging at around 2θ = 45.5° for the highest donor concentration (0.8 mol%) can be seen. This is due to the change of tetragonality parameter caused by the dopant incorporation into the perovskite lattice . The lattice parameters ( c/a ) as a function of La concentration were plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

A Rapid‐Doping Method for High‐Throughput Discovery Applied to Thick‐Film PTCR Materials

2011

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A novel high‐throughput combinatorial library preparation technique for ceramics requiring low levels of dopant is demonstrated and assessed for the case of donor‐doped barium titanate (BT) materials with positive temperature coefficient of resistance (PTCR). The droplet‐doping process is performed by infiltrating liquid dopant precursors into porous BT disks and viewed using a high‐speed camera. The resulting dopant distribution in the body of the disk shows high uniformity as assessed by energy dispersive (EDS) and wavelength dispersive (WDS) spectroscopies. X‐ray diffraction (XRD) measurements and resistivity–temperature (ρ–T) curves show evidence of the changes in structure and PTCR profiles with change in composition and are closely matched to previously published data for samples made by conventional ceramic routes. The procedure, thus validated, has the potential to deliver dopant‐doped BT‐based PTCR libraries rapidly with a very wide range of dopant mixtures and concentrations for electrical property measurement and deserves to be applied to other low‐level dopant ceramic systems.

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“…) to BT [7][8][9][10]. X-ray diffraction patterns obtained on a laboratory diffractometer with CuKα radiation confirmed the formation of perovskite phases with no evidence of any impurities.…”

Section: +mentioning

confidence: 95%

Effects of Nb⁵⁺ Addition on Microstructure and Dielectric Properties of BaTiO₃

Kim

Hyun

2017

Appl. Sci. Converg. Technol.

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Structural studies on the addition characteristics of Nb ions to BaTiO 3 solid solutions were performed by XRD and SEM/EDS technique. The X-ray diffraction peaks of the (111), (200) and (002) planes of Nb-doped BaTiO 3 solid solutions with different mole% of Nb were analyzed. We also investigated the relationship between the dielectric and structural properties of Nb-doped BaTiO 3 . The transition temperatures of BaTiO 3 solid solution doped with 0.5mole%Nb and 1.0 mole%Nb were ~116 o C and ~87 o C, respectively, which were found to be shifted to very low temperature from the transition temperature of pure BaTiO 3 (about 125 o C). As a result of analysis of 1/K versus T and ln[(1/K)-(1/K m ) versus (T-T m )] of the two compositions used in this experiment, the diffusivity slightly differs from that of pure BaTiO 3 at temperatures above Curie temperature. And this characteristic was analyzed by applying the modified Curie-Weiss law.

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Effect of doping method on microstructural and defect profile of Sb–BaTiO3

Cited by 18 publications

References 24 publications

PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties

PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties

A Rapid‐Doping Method for High‐Throughput Discovery Applied to Thick‐Film PTCR Materials

Effects of Nb⁵⁺ Addition on Microstructure and Dielectric Properties of BaTiO₃

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Effect of doping method on microstructural and defect profile of Sb–BaTiO3

Cited by 18 publications

References 24 publications

PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties

PTCR effect in donor doped barium titanate: review of compositions, microstructures, processing and properties

A Rapid‐Doping Method for High‐Throughput Discovery Applied to Thick‐Film PTCR Materials

Effects of Nb5+ Addition on Microstructure and Dielectric Properties of BaTiO3

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Effects of Nb⁵⁺ Addition on Microstructure and Dielectric Properties of BaTiO₃