Dielectric properties of Ba0.5Sr0.5TiO3–MgO composites synthesized by a citrate gel in situ process

Ji, Ludong; Zhang, Jingji; Gao, Yuee; Li, Yanli; Wang, Jiangying

doi:10.1016/j.ceramint.2014.03.084

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…It can be seen from Fig. and Table that the temperature at ε maxima ( T m ) of the BST/MgO composites without and with OA modification is almost equal to that of the BST/MgO composite prepared by a citrate gel in situ process, which confirms the successful synthesization of the stoichiometric composite by in situ oxalate precipitation process.…”

Section: Resultssupporting

confidence: 57%

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Zhang

et al. 2015

J. Am. Ceram. Soc.

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Ba 0.5 Sr 0.5 TiO 3 /MgO (BST/MgO) composite ceramics have been prepared in situ by using an oxalate precipitation process. SEM and TEM images show that oleic acid modified BST/ MgO nanocomposite exhibits helminth-like particles consisting of BST core and MgO shell. Results reveal that oleic acid modification is chemisorbed on MgO particles as a carboxylate to form MgO shell, which connects to interparticles. Accordingly, the BST particles are well surrounded naturally by a thin MgO layer in the composite ceramics. As a result, the oleic acid modified BST/MgO composite ceramics shows better dielectric properties, with permittivity of 203, loss tangent of 0.0025 (at 2.4 GHz), and tunability of 10.2%.

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Section: Resultssupporting

confidence: 57%

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Zhang

et al. 2015

J. Am. Ceram. Soc.

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“…(1− x )Ba 0.5 Sr 0.5 TiO 3 – x MgO composite ceramics were prepared using a citrate–nitrate combustion process, as reported elsewhere . The nominal amounts of Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , and Mg(NO 3 ) 2 ·6H 2 O powders were firstly dissolved in appropriate amounts of citric acid stirred at 60°C until the solution became transparent, and then cooled down to room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…To deepen the dependence of ε of BST on the dielectric volume fraction in BST‐based composites, low ε and low loss (tanδ) MgO dielectric with simple chemical composition that has been proven to be an effective dopant for the mitigation of the temperature dependence of ε and tanδ in BST ceramics is chosen. The authors previously developed a citrate–nitrate combustion process to in situ synthesize BST–MgO composite powders at low temperature of 700°C . It was found that the BST–MgO composite sintered at 1300°C exhibited weak phase transition pinning resulting from the existence of the dielectric peak of tetragonal–orthorhombic phase transition and good dielectric properties with ε of 730, tanδ of 0.002, and tunability (Tun) of 20.8%.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Effective Dielectric Response of Ba_0.5Sr_0.5TiO₃–MgO Composites Synthesized In Situ Process

Zhang

Jia

et al. 2014

J. Am. Ceram. Soc.

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1 -x)Ba 0.5 Sr 0.5 TiO 3 (BST)-xMgO composite ceramics have been prepared in situ by a citrate-nitrate combustion process, and their crystal structure and effective dielectric response have been investigated systematically. Results reveal that MgO particles homogeneously disperse in BST particles. Rietveld refinement of X-ray diffraction data shows that the amount of the incorporation of MgO into BST lattice is increased with increasing the MgO volume fraction (ƒ M ). It is identified that the incorporation of Mg 2+ into B site gives rise to the formation of F centers in the composites. Related with the incorporation of Mg 2+ into BST lattice, the permittivity of BST in the composite is strongly dependent on ƒ M , which is defined by the relation e BST ¼ a3e b3fM . Also, the high percolation threshold of ƒ M = 0.60 is observed, which is well in agreement with the theoretical predictions of the modified effective medium approximation coupled with the spherical inclusion model.

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“…Hence, many researches have been carried out into some ferroelectric materials, such as BaTiO 3 (BT), PbZr x Ti 1-x O 3 (PZT), PbTiO 3 (PT), Ba x Sr 1-x TiO 3 (BST) and so on [5][6][7]. Among them, BST has become an important candidate for microwave applications, by virtue of its high power density, good reliability and the Curie point (T c ) of BST can be regulated by varying the fraction of Sr [8][9][10]. However, microwave applications require materials with high tunability, low dielectric loss and a moderate dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

Qiu

et al. 2015

J Mater Sci: Mater Electron

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0.55Ba x Sr 1-x TiO 3 -0.45MgO composite ceramics (BST-MgO, x = 0.5-0.65) co-modified with CuO and MnO 2 were prepared by conventional soild state reaction method. The microstructure, phase and morphology were investigated. The results showed the formation of the perovskite BST phase and MgO phase. The dielectric constant (e r ) and tunability (T) of the ceramic samples increased with increasing Ba content. The dielectric loss (tan d) and figure of merit achieved their minimum and maximum at x = 0.6, respectively. The obtained ceramic sample with x = 0.6 exhibited favorable properties, which are listed as follows: e r = 190, tan d = 0.22 %, T = 16 %, E c = 5.6 kV/cm and FOM = 72.7.

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Dielectric properties of Ba0.5Sr0.5TiO3–MgO composites synthesized by a citrate gel in situ process

Cited by 14 publications

References 19 publications

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Crystal Structure and Effective Dielectric Response of Ba_0.5Sr_0.5TiO₃–MgO Composites Synthesized In Situ Process

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

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Dielectric properties of Ba0.5Sr0.5TiO3–MgO composites synthesized by a citrate gel in situ process

Cited by 14 publications

References 19 publications

Enhanced Dielectric Properties of Ba0.5Sr0.5TiO3/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Enhanced Dielectric Properties of Ba0.5Sr0.5TiO3/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Crystal Structure and Effective Dielectric Response of Ba0.5Sr0.5TiO3–MgO Composites Synthesized In Situ Process

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

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Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Crystal Structure and Effective Dielectric Response of Ba_0.5Sr_0.5TiO₃–MgO Composites Synthesized In Situ Process