Defect chemistry of alkaline earth metal (Sr/Ba) titanates

Shi, Tao; Chen, Yapeng; Guo, Xin

doi:10.1016/j.pmatsci.2015.10.002

Cited by 61 publications

(30 citation statements)

References 160 publications

(259 reference statements)

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“…The most simplified case is observing grain growth (ie, no shrinkage) in an electric field, but without electric power dissipation (ie, with blocking electrodes). This experiment was conducted in a previous study on strontium titanate, a material for which vast information is available on microstructure evolution in the absence of electric field, point‐defect chemistry, and interfacial properties . In this experiment, the seeded polycrystal technique was used.…”

Section: Introductionmentioning

confidence: 99%

Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility

et al. 2018

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This study investigates grain growth in the perovskite oxide strontium titanate in an electric field. The seeded polycrystal technique was chosen as it provides a sensitive and controlled setup to evaluate the impact of different parameters on grain growth due to the well‐defined driving force for grain growth. Current blocking electrodes were used to prevent Joule heating. The results show faster grain growth, and thus, higher grain‐boundary mobility at the negative electrode. It is argued that the electric field causes point‐defect redistribution, resulting in a higher oxygen vacancy concentration at the negative electrode. The local oxygen vacancy concentration is suggested to affect the space‐charge potential at the grain boundaries. A thermodynamic treatment of the grain‐boundary potential at a grain boundary without field shows that for a high oxygen vacancy concentration less space‐charge and less accumulation of cationic defects to the boundary occurs. Therefore, at the negative electrode, a higher oxygen vacancy concentration results in less space‐charge and less accumulation of cationic defects. The lower degree of defect accumulation requires less diffusion of segregated defects during grain‐boundary migration, so that at the negative electrode faster grain growth is expected, as found in the experiments.

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Section: Introductionmentioning

confidence: 99%

Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility

et al. 2018

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“…The oxygen partial pressure dependence of its mixed ionic-electronic conductivity makes it a good candidate for high temperature gas sensor applications (Fergus, 2007;Hu et al, 2004). Depending on the oxygen partial pressure, three regions with different p O 2 dependence may be regarded (Steinsvik et al, 1996;De Souza, 2009Shi, 2016).…”

Section: Ionic Transportmentioning

confidence: 99%

Oxygen transport in epitaxial SrTiO3/SrTi1 − xFexO3 multilayer stacks

Schulz

Orland

Mehlmann

et al. 2017

J. Sens. Sens. Syst.

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Abstract. Nano-ionic materials made of strontium titanate (SrTiO 3 , STO) and solid solutions of strontium ferrite in STO (SrTi 1−x Fe x O 3 , STF) are grown on single crystalline STO substrates and characterized. Since STF exhibits an oxygen deficiency and, simultaneously, enables oxygen interstitial defects, a space charge area close to the STO | STF interface is present. Oxygen tracer diffusion experiments and impedance spectroscopy at temperatures from 500 to 700 • C and at oxygen partial pressure ranging from 10 −3 to 10 −23 bar confirm fast oxygen transport caused by enhanced ionic conductivity at the interface. There, an oxygen diffusion coefficient of 3.4 × 10 −10 m 2 s −1 at 600 • C and a p type conductivity of about 360 S m −1 at 700 • C are calculated. Such structures open new options in design of nano-ionic materials for oxygen sensors and energy conversion at temperatures lower than those of conventional materials such as yttrium-doped zirconia.

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“…The energy band of (Ba Sr)TiO 3 is about 3.2‐3.4 eV, and it is an insulator at room temperature because of its wide band . More researchers have prepared (Ba Sr)TiO 3 as a matrix and made it into a PTC (positive temperature coefficient) thermistor …”

Section: Introductionmentioning

confidence: 99%

Correlation between B value deviation and sintering temperature of perovskite solid solution materials

et al. 2019

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The effects of different sintering temperatures on the system of Ba0.5Sr0.5TiO3–La0.8Ca0.2MnO3 (BST‐LCM) material were investigated by means of scanning electron microscopy, X‐ray, resistance‐temperature measurements, and X‐ray photoelectron spectroscopy. X‐ray diffraction and X‐ray photoelectron spectroscopy confirm that BST‐LCM is completely miscible and BST is the main phase, which under the premise of following the theory of small polaron conduction, titanium ions interact with manganese ions, which affects the electrical properties of the system of BST‐LCM material. For the electrical properties of related, the LCM content is inversely proportional to the activation energy. Through the linear fitting of the experimental data, the empirical formula between the sintering temperature B value and the content of solid solution is obtained, and the approximate B value within a certain range can be preliminarily calculated.

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Defect chemistry of alkaline earth metal (Sr/Ba) titanates

Cited by 61 publications

References 160 publications

Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility

Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility

Oxygen transport in epitaxial SrTiO<sub>3</sub>/SrTi<sub>1 − <i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3</sub> multilayer stacks

Correlation between B value deviation and sintering temperature of perovskite solid solution materials

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Defect chemistry of alkaline earth metal (Sr/Ba) titanates

Cited by 61 publications

References 160 publications

Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility

Grain growth in strontium titanate in electric fields: The impact of space‐charge on the grain‐boundary mobility

Oxygen transport in epitaxial SrTiO&lt;sub&gt;3&lt;/sub&gt;/SrTi&lt;sub&gt;1 − &lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Fe&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; multilayer stacks

Correlation between B value deviation and sintering temperature of perovskite solid solution materials

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Oxygen transport in epitaxial SrTiO<sub>3</sub>/SrTi<sub>1 − <i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3</sub> multilayer stacks