Influence of Titanium Ion Doped Amount on the Dielectric Property of BMNT Ceramics

2013 ◽  
Vol 760-762 ◽  
pp. 772-775
Author(s):  
Xin You Huang ◽  
Yuan Zuo ◽  
Chun Hua Gao
Keyword(s):  
Dielectric Property ◽  
Solid Phase ◽  
Pyrochlore Phase ◽  
Volume Density ◽  
Phase Method ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Solid Phase Method ◽  
Ceramic Density ◽  
Sintered Temperature

Bi2(Mgl/3Nb2/3-xTix)2O7(BMNT)(x=0.1, 0.15, 0.2, 0.25) ceramics was prepared by conventional solid phase method, The influence of titanium ion doped amount on the dielectric property and microstructure of BMNT ceramics were systematically studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and other testing and analysis how to methods. Results show that there is single monoclinic pyrochlore phase and there is not the second phase in all BMNT ceramics doped with titanium ion. The grain size of BMNT ceramics increases first and then decreases, the dielectric constant (εr) increases first and then decreases, the dielectric loss (tanδ) increases first and then decreases, the ceramic density decreases all the time while titanium ion doped amount increases. The ceramic density increases first and then decreases when sintered temperature increases. The density of BMNT ceramics doped with titanium ion is biggest when sintered temperature is 980 °C. When sintered temperature is 980 °C and titanium ion doped amount is 0.15mol, the dielectric properties of BMNT ceramics is good,which εris 135(1MHz), tanδ is 0.002(1MHz) and volume density is 7.46g/cm3.

Combustion Synthesis of La0.65Sr0.35MnO3 and its Sensing Properties for NO2

2016 ◽  
Vol 680 ◽  
pp. 208-211
Author(s):  
Lian Lian Wu ◽  
Qiang Li ◽  
Dan Yu Jiang ◽  
Jin Feng Xia
Keyword(s):  
Solid Phase ◽  
High Sensitivity ◽  
Combustion Method ◽  
Fast Response ◽  
Size Analysis ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Ultrafine Structure ◽  
Nox Sensor ◽  
Solid Phase Method

In this paper, La0.65Sr0.35MnO3 (LSM) oxide powder with ultrafine structure has been synthesized by self-propagating combustion method. The powders were characterized by X-ray diffraction, scanning electron microscopy and laser size analysis. Compared to the powders prepared by traditional solid-phase method, the grain size of powders prepared by self-propagating combustion method is relatively small and uniform. Starting from ultrafine LSM powders, sensing electrode (SE) for NO2 mixed-potential sensors based on yttria-stablized zirconia (YSZ) was fabricated. As-obtained NO2 sensor displays fast response and high sensitivity (25.4mV/decade). The response values of the sensor have good linear relationship with the logarithm of NO2 concentration varying from 30ppm to 500ppm.Keywords:Self-propagating combustion method; La0.65Sr0.35MnO3; NOx sensor; YSZ

scholarly journals Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

2020 ◽  
Author(s):  
Wei Lian ◽  
Yan Liu ◽  
Wenjie Wang ◽  
Yangtao Dong ◽  
Sheng Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Powder ◽  
Solid Phase ◽  
Raw Materials ◽  
Porous Ceramics ◽  
Volume Density ◽  
Synthesis Temperature ◽  
Phase Method ◽  
Microstructure And Mechanical Properties ◽  
Solid Phase Method

Abstract Mullite based porous ceramics were successfully prepared by using a solid-phase method with gangue, slime and sawdust as raw materials. The effects of the content of glass powder and calcining temperature on microstructure and mechanical properties of the samples were systematically studied. It is found that glass powder can prevent the formation of Kyanite and reduce the synthesis temperature of mullite. The samples with 4% glass powder have a large amount of mullite calcined at 1150°C for 3h. Meanwhile, alumina in the sample is completely converted into mullite at 1180°C for 3h. Mullite content reaches 64.2wt%. The minimum apparent porosity is 31.22%, while the maximum volume density and diameter shrinkage are 1.74g/cm 3 and 8.48%, respectively. The ratio of pores of <8μm to those of 8~20μm is varied from 7:2 to 2:7, due to the addition of the glass powder. With increasing content of mullite, the flexural properties of the samples are increased from 7.7MPa to 28.36MPa. Therefore, with solid wastes as the resource, the porous ceramics have a bright prospect.

Solubility of Mn in ZnO Crystallites Synthesized Using Solid State Techniques

2020 ◽  
Vol 3 (1) ◽  
pp. 28-39
Author(s):  
Esau Nii Abekah Akwetey Armah ◽  
Martin Egblewogbe ◽  
Hubert Azoda Koffi ◽  
Alfred Ato Yankson ◽  
Francis Kofi Ampong ◽  
...  
Keyword(s):  
Solid Phase ◽  
Solubility Limit ◽  
Phase Method ◽  
Regular Pattern ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Samples ◽  
Solid Phase Method ◽  
Mn Concentration

Powder samples of Zn1-xMnxO nanocrystal were synthesized at a temperature of 200 °C using solid phase method. Dopant concentrations of 0.005 ≤ x ≤ 0.5 were studied. Powder x-ray diffraction (PXRD) patterns of the samples were analyzed with a view of determining the onset of secondary phases, hence the solubility limit of the dopant. The solubility limit for Mn in ZnO samples synthesized at 200 °C is realized at x < 0.3. With a regular pattern in increment of the Mn concentration, there were variations observed in the trend of the relative intensity, 2θ position and d-spacing indicating uneven addition of Mn (thus Mn2+, Mn3+ or Mn4+).

scholarly journals Luminescence Performance of Yellow Phosphor SrxBa1−xTiO3: Eu3+, Gd3+for Blue Chip

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Limin Dong ◽  
Jian Li ◽  
Qin Li ◽  
Lianwei Shan ◽  
Zhidong Han
Keyword(s):  
Light Emission ◽  
Solid Phase ◽  
Phase Method ◽  
Photoluminescence Excitation ◽  
X Ray Diffraction ◽  
Yellow Light ◽  
X Ray ◽  
Potential Applications ◽  
Solid Phase Method ◽  
Luminescence Performance

The SrxBa1−xTiO3: Eu3+, Gd3+phosphors are synthesized by high temperature solid-phase method. Multiple techniques including X-ray diffraction (XRD), and scanning electron microscopy (SEM) are used to examine the surface morphology and structural properties of SrxBa1−xTiO3: Eu3+, Gd3+phosphors. The optical properties are presented and discussed in terms of photoluminescence (PL) and photoluminescence excitation (PLE) spectra. The as-obtained SrxBa1−xTiO3: Eu3+, Gd3+phosphors show higher PL emission intensity (at 591, 611 nm). The peaks at 591 and 611 nm are attributed to Eu3+  5D0-7F1,5D0-7F2. Gd3+has a strong sensitization on Eu3+. A certain amount of Sr2+and Ba2+is contributed to the intensity of light emission. After being irradiated with blue light, the phosphor samples emit yellow light. This suggests its potential applications in many fields.

Preparation and Characterization of Fe Doped Bi2Ga4O9 Ceramics

2014 ◽  
Vol 552 ◽  
pp. 283-285
Author(s):  
Huan Huan Chen ◽  
Xiao Yan Zhang ◽  
Xi Wei Qi ◽  
Zhao Jie Zhou ◽  
Gui Fang Sun
Keyword(s):  
Grain Size ◽  
Solid Phase ◽  
Sem Analysis ◽  
Phase Method ◽  
Second Phase ◽  
Doping Content ◽  
Fe Doping ◽  
Sintering Process ◽  
Solid Phase Method

A series of Fe-doped Bi2(FexGa1-x)4O9 (x=0.1,0.2,0.3,0.4,0.5) ceramics were synthesized by solid-phase method with sintering process. The influences of Fe doping content on phase, morphology, dielectric properties are discussed. XRD results show that there is no second phase in Fe-doped Bi2(FexGa1-x)4O9 ceramics. The SEM analysis indicates the grain size of as-prepared doped samples are relatively uniform and estimated to be about 1–4μm. The permittivity of as-prepared doped samples increases and the dielectric loss decrease compared to pure Bi2Ga4O9 ceramics.

Structure and Optical Thermometry Characterization of Er3+/Yb3+ Co-Doped BaGd2CuO5

2016 ◽  
Vol 16 (4) ◽  
pp. 3542-3546 ◽  
Author(s):  
Xiaodong Li ◽  
Yanjie Song ◽  
Yanmin Yang ◽  
Chao Mi ◽  
Yanzhou Liu ◽  
...  
Keyword(s):  
Solid Phase ◽  
Green Emission ◽  
Upconversion Emission ◽  
Phase Method ◽  
Excitation Density ◽  
Fluorescence Intensity Ratio ◽  
X Ray Diffraction ◽  
Solid Phase Method ◽  
Fir Technique ◽  
Co Doped

Er3+/Yb3+ co-doped BaGd2CuO5 upconversion luminescent materials are obtained by solid phase method. Rietveld refinement on X-ray diffraction data indicates that Er3+/Yb3+ ions are inclined to occupy the Gd(1) site in the structure of BaGd2CuO5 (green phase). Two green emission peaks located at 523 nm and 547 nm have been produced by the excitation of 971 nm LD. The fluorescence intensity ratio (FIR) of the two green emission peaks have been investigated in the temperature range of 290 K–594 K. The maximum sensitivity derived from the FIR technique of the green upconversion emission is approximately 0.0038 K−1, and it has a high transmission power at low excitation density. This result implies that the Er3+/Yb3+ co-doped BaGd2CuO5 phosphors can play an important role in temperature measurements with a better sensitivity.

scholarly journals Facile Synthesis of Mn0.68Bi0.32OCl Mix-Crystals And Its Supercapacitive Behavior

2021 ◽  
Author(s):  
Y.Z. Song ◽  
B.X. Qi ◽  
M.T. Li ◽  
J.M. Xie
Keyword(s):  
Surface Area ◽  
Solid Phase ◽  
Life Time ◽  
Molar Ratio ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Solid Phase Method

Abstract Mn0.68Bi0.32OCl mix-crystals for supercapacitor were successfully synthesized via a facile solid-phase method using Bi(NO3)3 and MnCl2 with molar ratio of 1:1 as precursors. The Mn0.68Bi0.32OCl mix-crystals were characterized by scanning electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller surface area measurements and thermogravimetry and differential scanning calorimetry, respectively. Cyclic voltammetry and galvanostatic charge/discharge technique were performed for the Mn0.68Bi0.32OCl mix-crystals in 1 M Na2SO4 aqueous solutions; the specific capacitance of Mn0.68Bi0.32OCl was about 203 F.g-1 at the current density of 3 A. g-1 with a long life time, owing to the high power density of Mn0.68Bi0.32OCl mix-crystals and the higher surface area, good conductivity, and high stability of the Mn0.68Bi0.32OCl mix-crystals.

Solid Phase Synthesis and Optical Properties of CdTiO3 Submicron Particles from Cd(OH)2 and P25 TiO2

2015 ◽  
Vol 713-715 ◽  
pp. 2868-2871 ◽  
Author(s):  
Jing Li ◽  
Xin Wang ◽  
Yan Chen ◽  
Wen Chang Zhuang
Keyword(s):  
Optical Properties ◽  
Solid Phase ◽  
Cost Effective ◽  
Submicron Particles ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Phase Synthesis ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Solid Phase Method

A simple and cost-effective low temperature (600 oC) solid phase method was proposed for the synthesis of CdTiO3 submicron particles, using Cd (OH)2 and P25 TiO2 as the starting materials. The composition and structure of the as-synthesized CdTiO3 submicron particles were characterized by X-ray diffraction and transmission electron microscopy. Besides, the optical properties of the as-synthesized CdTiO3 submicron particles were characterized by UV-vis diffuse reflection spectrum and photoluminescence spectrum.

Peculiarities of a solid-phase method for the Al-Fe/SiO2 and Al-Co/SiO2 powder catalysts production

2019 ◽  
pp. 63-68
Author(s):  
V.A. Artyukh ◽  
◽  
V.N. Borsch ◽  
V.S. Yusupov ◽  
S.Ya. Zhuk ◽  
...  
Keyword(s):  
Solid Phase ◽  
Phase Method ◽  
Solid Phase Method ◽  
Sio2 Powder

Synthesis and biological activity of new metallocenic angiotensin II analogs

1988 ◽  
Vol 53 (11) ◽  
pp. 2914-2919 ◽  
Author(s):  
Pierrette Maes ◽  
Annie Ricouart ◽  
Emmanuel Escher ◽  
André Tartar ◽  
Christian Sergheraert
Keyword(s):  
Amino Acids ◽  
Biological Activity ◽  
Angiotensin Ii ◽  
Solid Phase ◽  
Rabbit Aorta ◽  
Phase Method ◽  
Solid Phase Method

Analogs of angiotensin II in which phenylalanine in position 8 was replaced with cymantrenylalanine or with its triphenylphosphine photosubstitution product were synthesized by the solid-phase method. On rabbit aorta strips, these peptides were found to be pure antagonists of angiotensin II. Their relative affinities are higher than most other analogs substituted in position 8 with bulky amino-acids.

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