scholarly journals Impedance spectroscopy and dielectric studies of nanocrystalline iron doped barium strontium titanate ceramics

2015 ◽  
Vol 9 (2) ◽  
pp. 73-79 ◽  
Author(s):  
Reenu Jacob ◽  
Harikrishnan Nair ◽  
Jayakumari Isac
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Research Attention ◽  
X Ray ◽  
Barium Strontium ◽  
Iron Doped ◽  
Different Temperatures ◽  
Nanocrystalline Iron ◽  
Titanate Ceramics

Barium titanate compounds have great research attention due to their good electric and in some case interesting magnetic properties. The synthesis and characterization of iron doped barium strontium titanate (BSFTO) make an attempt to understand its structure and investigate electric/dielectric properties. The formation of a perovskite compound with tetragonal phase was confirmed through X-ray structural studies. Dielectric and electrical impedance properties of the sintered BSFTO ceramics were measured in the frequency range from 42Hz to 2MHz and at different temperatures (up to 600?C). It was shown that the properties of this material are highly dependent on temperature and frequency. The nature of frequency dependence of AC conductivity confirms the Jonscher?s power law. The temperature dependence of DC conductivity obeys the Arrhenius behaviour.

Preparation and Characterization of Nanosized Barium-Strontium Titanate Immobilized on Aluminum Oxide and its Application in Separation of Cr(III) and Cr(VI)

2010 ◽  
Vol 152-153 ◽  
pp. 1013-1016
Author(s):  
Hong Wang ◽  
Jing Yang
Keyword(s):  
Aluminum Oxide ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Sol Gel ◽  
Complete Separation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Barium Strontium

Nanometer barium-strontium titanate based coated aluminum oxide (ABST) was prepared by the sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its application in speciation of Cr(III) and Cr(VI) from water were studied. The results showed that the nanometer barium-strontium titanate was immobilized on aluminum oxide firmly, becoming a new adsorbent. Two forms of chromium showed different exchange capacities at different pH values, viz. Cr (III) selectively retained at pH 10–13, whereas Cr (VI) retained at pH 1. Hence complete separation of the two forms of chromium is possible. Retained species were eluted with 5mL of 1 mol•L−1 HCl and 1 mol•L−1 NaOH. The Cr(III) and Cr(VI) concentration was measured by atomic absorption spectroscopy. The adsorbent had a promising prospect in the separation of Cr(III) and Cr(VI) in environment water.

scholarly journals Synthesis and characterization of nickel oxide doped barium strontium titanate ceramics

Cerâmica ◽  
2012 ◽  
Vol 58 (345) ◽  
pp. 99-104 ◽  
Author(s):  
M. Banerjee ◽  
S. Mukherjee ◽  
S. Maitra
Keyword(s):  
Nickel Oxide ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Barium Carbonate ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
X Ray Diffraction ◽  
Barium Strontium ◽  
Titanate Ceramics

Barium strontium titanate (BST) ceramics (Ba0.6Sr0.4)TiO3 were synthesized by solid state sintering using barium carbonate, strontium carbonate and rutile as the precursor materials. The samples were doped with nickel oxide in different proportions. Different phases present in the sintered samples were determined from X-ray diffraction investigation and the distribution of different phases in the microstructure was assessed from scanning electron microscopy study. It was observed that the dielectric properties of BST were modified significantly with nickel oxide doping. These ceramics held promise for applications in tuned circuits.

Direct and indirect measurement of large electrocaloric effect in barium strontium titanate ceramics

2019 ◽  
Vol 17 (3) ◽  
pp. 1354-1361 ◽  
Author(s):  
Guangzhou Dai ◽  
Shibin Wang ◽  
Guanhua Huang ◽  
Guirong Chen ◽  
Biao Lu ◽  
...  
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Indirect Measurement ◽  
Electrocaloric Effect ◽  
Barium Strontium ◽  
Titanate Ceramics

Barium Strontium Titanate Ceramics Prepared by a Reaction-Sintering Process

2004 ◽  
Vol 848 ◽  
Author(s):  
Yi-Cheng Liou ◽  
Jen-Hsien Chen ◽  
Chi-Ting Wu
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Reaction Sintering ◽  
Sintering Process ◽  
Barium Strontium ◽  
Bst Ceramics ◽  
Titanate Ceramics

ABSTRACTBarium strontium titanate (Ba0.7Sr0.3TiO3, BST) ceramics prepared by a reaction-sintering process were investigated. The mixture of raw materials of stoichiometric Ba0.7Sr0.3TiO3 was pressed and sintered into ceramics without any calcination stage involved. Perovskite BST ceramics were obtained after sintered at 1330–1370°C for 2–6 h. For 6 h soak time, a density value 5.68g/cm3 (99.8% of the theoretic value) was obtained at 1350°C sintering. Grains of sizes between 2μm and 15μm were formed after 1330–1370°C sintering for 2–6 h. A diffused ferroelectric-paraelectric transition was observed in pellets sintered at 1330°C for 2 h and disappeared at a longer soak time or a higher sintering temperature.

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