Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry

Fengcheng, China

Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry

Fengcheng, China
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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.


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.


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 | Wang X.F.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2010

The mixed alkali effect in xK2O-(30 - x) Na2O- 30P2O5-40ZnO was firstly observed. Density, DSC, DC electrical conductivity, chemical durability and IR have been carried out for xK2O-(30 - x) Na2O-30P2O5-40ZnO glasses. The DC electrical conductivity was measured in the temperature range between 100 °C and < Tg. The strength of the MAE in T g, DC electrical conductivity, and activation energy has been determined. It is observed that the strength of MAE in DC electrical conductivity is less pronounced with the increase of temperature. The extremum of the glass transition temperature, the DC electrical conductivity, the activation energy, and the DR were observed along with the variation of K alkali ratio [K]/[K + Na] (alkali dosage is constant). The results showed that extremum was caused by the large energy mismatch for ions jumping between dissimilar alkalis' sites as Swenson's structural model suggested, generally shown as the K+ vibration pathway blocking by the Na+ due to the difference of ions' diameter. IR convinced the good correlation between MAE of xK2O-(30 - x) Na2O-30P2O 5-40ZnO system glasses and the origination of metaphosphate structure, secondarily pyrophosphate, and [ZnO6] octahedral. Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.


Gao D.N.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Li Z.J.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Guo H.W.,Shaanxi University of Science and Technology | Wang X.F.,Shaanxi University of Science and Technology
Advanced Materials Research | Year: 2014

Pure eulytite Bi4 (SiO4)3 crystals were prepared by high temperature melt cooling method using Bi2O3 and SiO2 as starting materials. In this study, the 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 that eulytite Bi4 (SiO4)3 was crystallized when high temperature glass-melt were cooled to 943° and obvious exothermal peak is shown on the DSC curve; and pure eulytite Bi4 (SiO4)3 crystals were synthesized by keeping the processing temperature for 8 hours. Bi4 (SiO4)3 grains grew larger and the amount of vacancy increased along with the extension of holding time, while Bi4 (SiO4)3 grains still presented a structure of partial ordering. Eulytite Bi4 (SiO4)3 prepared through melt-cooling method is of high purity and good stability, and can be applied as starting materials of preparation of Bi4(SiO4)3 thin film and high quality Bi4 (SiO4)3 macrocrystal. © (2014) Trans Tech Publications, Switzerland.


Wu T.,Shaanxi University of Science and Technology | Wu T.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Pu Y.,Shaanxi University of Science and Technology | Chen K.,Shaanxi University of Science and Technology
Ceramics International | Year: 2013

Ba0.4Sr0.6Zr0.15Ti0.85O 3 ceramics with SrO-B2O3-SiO2 glass additives were prepared via the solid state reaction route. The effects of glass contents on the sintering behavior, dielectric properties, microstructures, and energy storage properties of BSZT ceramics were investigated. Dielectric breakdown strength of 22.4 kV/mm was achieved for BSZT ceramics with 20 wt% glass addition. Dielectric relaxation behavior was observed in dielectric loss versus temperature plots. In order to investigate the mechanism of dielectric breakdown performance, the relationship between dielectric breakdown strength and grain boundary barrier was studied by the measurements of breakdown strength and activation energy. A discharged energy density of 0.45 J/cm3 with an energy efficiency of 88.2% was achieved for BSZT ceramics with 5 wt% glass addition. © 2013 Elsevier Ltd and Techna Group S.r.l.


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.


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.


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 | Gong Y.X.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | And 2 more authors.
Materials Letters | Year: 2010

The mechanically improved foam glass composite toughened by glass fiber was prepared by sintering technique, using waste sodium-calcium silicon flat glass powder as main raw materials. In this study, the preparation and properties of the samples were characterized by differential thermal analysis (DTA), field-emission scanning electron microscopy (FESEM) and mechanical property test. The specific strength of the composite was defined for the first time, and applied into the investigation of mechanical property. The results show that the specific improved bending strength of 10.45-22.26 MPa/(g cm- 3), and the specific compressive strength of 30.45-34.34 MPa/(g cm- 3) can be displayed when sintered at 790-815 °C with the addition of 5-25 wt.% glass fiber. Good correlations between the microstructure (in particular the fiber distribution), the high specific strength and the high modulus of elasticity of glass fibers. © 2010 Elsevier B.V.


Lu J.-Q.,Shaanxi University of Science and Technology | Lu J.-Q.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | Wang X.-F.,Shaanxi University of Science and Technology | Wang X.-F.,Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry | And 4 more authors.
Materials Letters | Year: 2012

Pure Bi 2SiO 5 powders were synthesized by molten salt method in NaCl-Na 2SO 4 flux using Bi 2O 3 and SiO 2 as raw materials. The results showed that the pure metastable state compound Bi 2SiO 5 was obtained in NaCl-Na 2SO 4 flux at 625 °C for 1 h, which was lower than that (generally 750 °C) of conventional solid state reaction. X-ray diffraction revealed that in the case of NaCl-Na 2SO 4 molten salt, with increasing synthesis temperature (600 °C to 625 °C), stable state Bi 12SiO 20 transformed into metastable state Bi 2SiO 5 and with synthesis temperature increasing from 625 °C to 700 °C, metastable state Bi 2SiO 5 transformed into stable state Bi 4Si 3O 12 gradually. Therefore, calcination temperature played a crucial role in the formation of Bi 2SiO 5 powder. The field-emission scanning electron microscopy images disclosed that the Bi 2SiO 5 samples showed nest like morphology, which was soft aggregation of Bi 2SiO 5 nanosheets. Moreover, it also indicated that the mechanism of the process of molten salt synthesis was "dissolution- precipitation mechanism". © 2012 Elsevier B.V. All rights reserved.


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.

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