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Chen K.,Shaanxi University of Science and Technology | Chen K.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Pu Y.,Shaanxi University of Science and Technology | Xu N.,Shaanxi University of Science and Technology | Luo X.,Shaanxi University of Science and Technology
Journal of Materials Science: Materials in Electronics | Year: 2012

SrO-B 2O 3-SiO 2 glass powders were prepared and employed as sintering aids to reduce the sintering temperature of Ba 0.4Sr 0.6TiO 3 ceramics. The effects of glass content and sintering temperature on the densification, dielectric properties and energy storage properties of Ba 0.4Sr 0.6TiO 3 ceramics have been investigated. The relative density characterization results indicate that densification of Ba0.4Sr0.6TiO3 ceramics with glass content becomes apparently from sintering temperature of 1,060 °C. XRD results show all Ba 0.4Sr 0.6TiO 3 ceramics exhibit a perovskite structure without the formation of a secondary phase. The dielectric constant and dielectric loss decreased gradually with increasing glass content. The relationship between dielectric constant and breakdown strength was discussed using the thermochemical model. A discharged energy density of 0.44 J/cm 3 with an energy efficiency of 67.4% was achieved for Ba 0.4Sr 0.6TiO 3 ceramic with 2.0 wt% glass addition sintered at 1,180 °C. © Springer Science+Business Media, LLC 2012. Source


Gao D.,Shaanxi University of Science and Technology | Ma J.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Li Z.,Shaanxi University of Science and Technology | Liu J.,Shaanxi University of Science and Technology
Materials Letters | Year: 2014

The white magnetic paper is a kind of promising functional materials in many fields. In this paper, a new high white magnetic paper had been successfully prepared by lumen loading process using Tb-based inorganic magnetic particles. The samples were characterized by superconductivity quantum interference device (SQUID), scanning electron microscope (SEM) and physical properties. The effect of the addition of magnetic particles on the physical properties of magnetic paper was investigated in detail. SEM micrograph clearly shown that the magnetic particles had attached evenly in the interstitial of fibers and lumen loading allowed magnetic particles to be introduced into the lumens of wood fibers. And SQUID indicated that the magnetic particles and papers were paramagnetic materials. The results of physical properties of magnetic papers indicated that the tensile strength and tearing strength of papers increased firstly and then decreased with increasing addition of magnetic particles. Meanwhile, the whiteness of papers was improved obviously which was greater than 80% in contrast to other papers produced by adding ferrite. © 2014 Elsevier B.V. Source


Guo H.W.,Shaanxi University of Science and Technology | Guo H.W.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Wang X.F.,Shaanxi University of Science and Technology | Gao D.N.,Shaanxi University of Science and Technology
Materials Letters | Year: 2012

Pure Bi2SiO5 crystals were firstly prepared by a novel method of melt-cooling process with Bi2O3 and SiO2 as starting materials. In this study, the preparation and properties of the samples were characterized by thermo gravimetric (TG), differential scanning calorimeter (DSC), field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results showed several endothermic valleys at 579.6 °C, 744.3 °C, 829.3 °C and 879.2 °C during heating process; and a distinct exothermic peak at 805.3 °C during the melt cooling process. XRD and SEM images revealed highly-ordered lamellar pure Bi2SiO5 crystals with coarse grains can be achieved by 2 h heating at 805.3 °C. © 2011 Elsevier B.V. All rights reserved. Source


Yuan Q.,Shaanxi University of Science and Technology | Yuan Q.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Pu Y.,Shaanxi University of Science and Technology | Cao B.,Shaanxi University of Science and Technology
Materials Letters | Year: 2012

As a candidate for lead-free positive temperature coefficient of resistivity (PTCR) ceramics, BaTiO 3 (BT) ceramics with different Bi-based compounds (K 0.5Bi 0.5TiO 3, BaBiO 3, Bi 4Ti 3O 12 and Bi 2O 3) were fabricated by a conventional solid state reaction. The effects of Bi-based compounds additives on the phase composition, microstructure and PTCR characteristics of BT ceramics were investigated with X-ray diffraction, scanning electron microscope, and resistivity-temperature measurement instrument. The results showed that the average grain size, the Curie temperature (Tc) and the room temperature resistivity (ρ RT) of BT ceramics varied with the additives of Bi-based compounds. The minimum value of ρ RT for BT ceramics with different Bi-based compounds could be obtained when the atom concentrations of bismuth were around 0.2%. The ceramic samples showed a moderate PTCR effect, with a resistance jump greater by 1.43 orders of magnitude and increased Tc about 120132 °C, along with a low resistance of 41500 Ω cm. © 2012 Elsevier B.V. Source


Yuan Q.,Shaanxi University of Science and Technology | Yuan Q.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Pu Y.,Shaanxi University of Science and Technology
Ceramics International | Year: 2013

(1-x)BaTiO3-xK0.5Bi0.5TiO3 (abbreviated as BT-KBT, 0.10≦x≦0.15) dielectric ceramics were prepared by a conventional oxide mixing method. The effects of KBT content on the densification, microstructure and dielectric properties of BT ceramics were investigated. The density characterization results show that the addition of KBT significantly lowered the sintering temperature of BT ceramics to about 1280 °C. The XRD results showed that the phase compositions of all samples were pure tetragonal phases. The dielectric constant and dielectric loss firstly increased and then decreased with the increase of KBT. In addition, dielectric constant and dielectric loss versus frequency were characterized in the frequency range from 100 Hz to 2 MHz. It is found that the dielectric constant and the dielectric loss changed with the increase of KBT contents regularly. © 2012 Elsevier Ltd and Techna Group S.r.l. Source

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