Effect of heating rate on the properties of Sb and Mn-doped barium strontium titanate PTCR ceramics

Bomlai, Pornsuda; Sirikulrat, N.; Tunkasiri, Tawee

doi:10.1016/j.matlet.2004.07.049

Cited by 26 publications

(15 citation statements)

References 17 publications

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“…They observed an increase in the content of Ba 4 Ti 13 O 30 phase with the increase in the ratio of Sr:(Sr+Ba) from 0.245 to 0.70 for BST powder sintered at 1,200°C. In another investigation on doped BST ceramics, Ba 6 Ti 17 O 40 and Ba 2 TiSi 2 O 8 secondary phases were observed [27].…”

Section: Effect Of Sintering On Phase Composition/transformationmentioning

confidence: 89%

Synthesis and characterization of nanocrystalline Barium Strontium Titanate powder via sol-gel processing

Somani

Kalita

2007

J Electroceram

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Barium Strontium Titanate (BST) solid solution is a strong candidate material for application in tunable ferroelectric devices. In this research, we have synthesized and characterized nanocrystalline BST (Ba 0.7 Sr 0.3 TiO 3 ) powder with average particle-diameter of 15 nm through a simple sol-gel process, using barium acetate, strontium acetate and titanium isopropoxide as the precursors. In this process, stoichiometric proportions of barium acetate and strontium acetate were dissolved in acetic acid followed by refluxing, and addition of titanium (IV) isopropoxide to form BST gel. The gel was analyzed using Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA). The as-formed gel was dried at 200°C and then calcined in the temperature range of 400 to 800°C for crystallization. Phase evolution during calcination was studied using X-ray diffraction (XRD) technique. Particle size, morphology and the lattice fringes of the calcined powder were characterized by high-resolution transmission electron microscopy (HR-TEM). To study the effects of sintering on BST nanopowder, green ceramic specimens were prepared by uniaxial compaction and then sintered at 950-1,100°C under atmospheric conditions. Sintered specimens were analyzed for phase composition, grain size and geometric bulk density.

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Section: Effect Of Sintering On Phase Composition/transformationmentioning

confidence: 89%

Synthesis and characterization of nanocrystalline Barium Strontium Titanate powder via sol-gel processing

Somani

Kalita

2007

J Electroceram

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“…Specifics regarding lowering of either the TiO 2 /SrTiO 3 or the TiO 2 /PbTiO 3 eutectic temperatures by the addition of SiO 2 and/or Al 2 O 3 have not been found in the published literature. However, Ba 1−x Pb x TiO 3 sintered in the presence of AST exhibits a liquid phase-sintered microstructure after heat treatment at 1180 • C [27], and Ba 1−x Sr x TiO 3 also exhibits such a characteristic microstructure following sintering with TiO 2 and SiO 2 at 1350 • C [28]. In the current work, the dilatometry data in Fig.…”

Section: Sinteringmentioning

confidence: 52%

“…The l00 • C difference between this temperature and the 1350 • C quoted for Ba 1−x Sr x TiO 3 in ref [28]. may be due either to the absence of the Al 2 O 3 sintering aid component in that study, or the fact that titanate phase in said study was formed in situ from oxide and carbonate raw materials by the solid state reaction route in the presence of the sintering aid, rather than from a mixture of titanates and sintering aids as is the case here.…”

mentioning

confidence: 59%

Barium titanate-based PTCR thermistor fibers: Processing and properties

Wegmann

Brönnimann

Clemens

et al. 2007

Sensors and Actuators A: Physical

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“…Figure 7 shows XRD patterns for both as-sintered samples (a) and reoxidized samples (b). The Ba 2 TiSi 2 O 8 secondary phase [25], existing in negligible amounts, was detected in the as-sintered samples. The secondary phase may have formed during powder production as the same peak was detected in starting (Ba,Sr)TiO 3 powders.…”

Section: Resultsmentioning

confidence: 93%

PTCR characteristics and microstructure of porous (Ba,Sr)TiO3 ceramics prepared by spark plasma sintering

et al. 2010

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Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few µm and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 × 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

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Effect of heating rate on the properties of Sb and Mn-doped barium strontium titanate PTCR ceramics

Cited by 26 publications

References 17 publications

Synthesis and characterization of nanocrystalline Barium Strontium Titanate powder via sol-gel processing

Synthesis and characterization of nanocrystalline Barium Strontium Titanate powder via sol-gel processing

Barium titanate-based PTCR thermistor fibers: Processing and properties

PTCR characteristics and microstructure of porous (Ba,Sr)TiO3 ceramics prepared by spark plasma sintering

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