scholarly journals Hydrothermal synthesis and characteristics of lanthanumdoped pb(Zr₀.₆₅Ti ₀.₃₅)O₃ ceramics

2021 ◽  
Vol 8 (3) ◽  
pp. 14-19
Author(s):  
Thuy Nguyen Thanh ◽  
Tung Nguyen Van ◽  
Hung Nguyen Trong ◽  
Minh Cao Duy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Reaction Temperature ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Influence Of Ph ◽  
Scanning Electron

Lanthanum-doped lead zirconate titanate (PLZT) powders were synthesized using thehydrothermal method. The influence of pH, reaction temperature and time, lanthanum concentration on the formation and characteristics of PLZT were investigated. Obtained powders were investigated using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) techniques and a dielectric analyzer. The results showed that           Pb1-xLax(Zr0.65Ti0.35)O3 with x= 0.0 – 0.1 were well formed under conditions: pH≥13, reaction time of 12hrs, reaction temperature of 180oC. Dielectric constant of PLZT is higher than PZT. The grain size of the PLZT is found to be 1–3.5 µm.

Phase Development and Dielectric Properties of 0.98BaTiO3-0.02Ba (Mg1/3Nb2/3) O3 Ceramic

2011 ◽  
Vol 700 ◽  
pp. 58-62
Author(s):  
Rachanusorn Roongtao ◽  
Supagorn Rugmai ◽  
Wanwilai C. Vittayakorn
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Loss Factor ◽  
X Ray Diffraction ◽  
Phase Purity ◽  
X Ray ◽  
Phase Development ◽  
Scanning Electron

The 0.98BaTiO3-0.02Ba (Mg1/3Nb2/3) O3ceramics has been synthesized through a conventional mixed-oxide by using BT nanopowder and BMN micropowder. The phase purity of the powders and the ceramics was examined using X-ray diffraction (XRD). The 0.98BT-0.02BMN powders were sintered to 92% of the theoretical density at a temperature of 1300 °C for 2 h. The microstructure of the sintered surface was investigated using scanning electron microscopy (SEM). The dielectric constant (εr) and loss factor (tanδ) of the sintered pellets at Curie temperture were 3000 and 0.015, respectively.

Experimental Study on Combustion Reaction between Silicon and Nitrogen in Transport Bed

2013 ◽  
Vol 860-863 ◽  
pp. 1374-1377
Author(s):  
Shao Wu Yin ◽  
Li Wang ◽  
Li Ge Tong ◽  
Chuan Ping Liu ◽  
Xing Long Zheng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Experimental Study ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Combustion Reaction ◽  
X Ray Diffraction ◽  
Amorphous Silicon Nitride ◽  
X Ray ◽  
Scanning Electron

Combustion reaction between silicon powders and nitrogen in transport bed was studied. The reaction temperature ranged from 1523 to 1653 K, and the reaction time ranged from 0 to 2.7 min. The phase compositions, morphologies and chemical composition of the products were analyzed by X-ray diffraction, scanning electron microscopy and O/N determinater, respectively. The experimental results showed, in the case of silicon powders with particle size of 2.2 μm, the conversion rate of silicon was 61.9% at reaction temperature of 1653 K and reaction time of 2.7min, and the products mainly comprised amorphous silicon nitride powders.

Characterization of Lead Zirconate Titanate Powders Prepared by a Hydrothermal Method

2005 ◽  
Vol 902 ◽  
Author(s):  
Lingjuan Che ◽  
Yongping Ding ◽  
Jinrong Cheng ◽  
Chao Chen ◽  
Zhongyan Meng
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Method ◽  
Lead Zirconate Titanate ◽  
Fourier Transformation ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zirconate Titanate ◽  
Scanning Electron

AbstractLead Zirconate Titanate (PZT) powders have been synthesized by a hydrothermal method at the processing temperatures of 120-220 °C for 1.5-50 hours, based on the reaction of Pb(CH3COOH)2·3H2O, ZrOCl2·8H2O, Ti(C4H9O)4 and KOH. Hydrothermally treated PZT powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transformation infrared (FTIR) techniques respectively. The influences of hydrothermal synthesize conditions on the crystalline structure and the morphology of PZT particles were investigated. Crystallized PZT powders could be synthesized at the KOH concentration of >2.5 mol/l.

Influence of pH on Phosphate Intercalation in Zinc-Aluminum Layered Double Hydroxide

1998 ◽  
Vol 63 (5) ◽  
pp. 741-748 ◽  
Author(s):  
Mohamed Badreddine ◽  
Ahmed Legrouri ◽  
Allal Barroug ◽  
André De Roy ◽  
Jean-Pierre Besse
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Layered Double Hydroxide ◽  
Chloride Ion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Phosphate Ions ◽  
Double Hydroxide ◽  
Influence Of Ph ◽  
Scanning Electron

The exchange of chloride ion by phosphate ions in [Zn-Al-Cl] layered double hydroxide was investigated using X-ray diffraction and infrared spectroscopy. The effects of the pH of the solution containing the phosphate ions on the ion exchange was studied. The best sample in terms of crystallinity, was obtained at pH 8. This sample was further characterized by scanning electron microscopy and microanalysis.

scholarly journals SYNTHESIS AND DIELECTRIC PROPERTIES OF FOUR-LAYERED AURIVILLIUS SrBi4Ti4O15 DOPED Nd3+ AND Mn4+

2016 ◽  
Vol 11 (2) ◽  
pp. 127
Author(s):  
Sestry Misfadhila ◽  
Evi Adhelina ◽  
Yestria Rilda ◽  
Syukri Arief ◽  
Zulhadjri Zulhadjri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Xrd Analysis ◽  
Orthorhombic Symmetry ◽  
Molten Salt Method ◽  
X Ray Diffraction ◽  
Aurivillius Phase ◽  
X Ray ◽  
Scanning Electron

<p>Synthesis of four-layered Aurivillius compound doped with Nd<sup>3+</sup> and Mn<sup>4+ </sup>cations, SrBi<sub>3.5</sub>Nd<sub>0.5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub> (<em>x</em> = 0; 0.5; 1) was carried out using molten salt method with a mixture of Na<sub>2</sub>SO<sub>4</sub>/K<sub>2</sub>SO<sub>4</sub> as a flux. The synthesized products were characterized using X-ray diffraction (XRD) and refined by <em>Le Bail</em> technique. The results of XRD analysis show that the four-layered Aurivillius compound formed, however there are additional peaks identified as perovskite and Bi<sub>7.68</sub>Ti<sub>0.32</sub>O<sub>12.16</sub>  phases for <em>x</em> = 0 and perovskite and Sr<sub>4</sub>Ti<sub>3</sub>O<sub>10</sub>phases for <em>x</em> = 0.5 and 1. The results of refinement show that four-layered Aurivillius phase formed has orthorhombic symmetry with <em>A2<sub>1</sub>am</em> space group. Scanning Electron Microscopy (SEM) shows the plate like morphology that are characteristic of Aurivillius compound. Dielectric constant of the samples show increasing value as increasing of Mn<sup>4+</sup> concentration.</p>

Preparation, Characterization and Dielectric Properties of BT/PI Film

2012 ◽  
Vol 476-478 ◽  
pp. 819-823
Author(s):  
Jun Jun Lv ◽  
Ming Yu Li ◽  
Qing Xuan Zeng ◽  
Shuang Zhao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Composite Film ◽  
Solution Method ◽  
Dielectric Strength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Comprehensive Performance ◽  
Scanning Electron

By using mixture solution method, Barium titanate/polyimide(BT/PI) composite film was prepared. Influence of different size and filling quantity of BT particles were investigated. The microstructure and properties of the products were characterized by scanning electron microscopy, X-ray diffraction and other analysis methods. The results show that when BT nanoparticles are used, the BT/PI film has better comprehensive performance. As the filling quantity of BT particles increases, the dielectric constant and dielectric loss of BT/PI composite film increase, and the dielectric strength is reduced.

scholarly journals SYNTHESIS AND DIELECTRIC PROPERTIES OF FOUR-LAYERED AURIVILLIUS SrBi4Ti4O15 DOPED Nd3+ AND Mn4+

2016 ◽  
Vol 11 (2) ◽  
pp. 127
Author(s):  
Sestry Misfadhila ◽  
Evi Adhelina ◽  
Yestria Rilda ◽  
Syukri Arief ◽  
Zulhadjri Zulhadjri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Xrd Analysis ◽  
Orthorhombic Symmetry ◽  
Molten Salt Method ◽  
X Ray Diffraction ◽  
Aurivillius Phase ◽  
X Ray ◽  
Scanning Electron

<p>Synthesis of four-layered Aurivillius compound doped with Nd<sup>3+</sup> and Mn<sup>4+ </sup>cations, SrBi<sub>3.5</sub>Nd<sub>0.5</sub>Ti<sub>4-x</sub>Mn<sub>x</sub>O<sub>15</sub> (<em>x</em> = 0; 0.5; 1) was carried out using molten salt method with a mixture of Na<sub>2</sub>SO<sub>4</sub>/K<sub>2</sub>SO<sub>4</sub> as a flux. The synthesized products were characterized using X-ray diffraction (XRD) and refined by <em>Le Bail</em> technique. The results of XRD analysis show that the four-layered Aurivillius compound formed, however there are additional peaks identified as perovskite and Bi<sub>7.68</sub>Ti<sub>0.32</sub>O<sub>12.16</sub>  phases for <em>x</em> = 0 and perovskite and Sr<sub>4</sub>Ti<sub>3</sub>O<sub>10</sub>phases for <em>x</em> = 0.5 and 1. The results of refinement show that four-layered Aurivillius phase formed has orthorhombic symmetry with <em>A2<sub>1</sub>am</em> space group. Scanning Electron Microscopy (SEM) shows the plate like morphology that are characteristic of Aurivillius compound. Dielectric constant of the samples show increasing value as increasing of Mn<sup>4+</sup> concentration.</p>

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Environmental scanning electron microscopy of fresh human gallstones reveals new morphologies of precipitated calcium salts

1992 ◽  
Vol 50 (2) ◽  
pp. 1322-1323
Author(s):  
Howard S. Kaufman ◽  
Keith D. Lillemoe ◽  
John T. Mastovich ◽  
Henry A. Pitt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Calcium Salts ◽  
Cholesterol Gallstones ◽  
X Ray ◽  
Ca Carbonate ◽  
Scanning Electron

Gallstones contain precipitated cholesterol, calcium salts, and proteins. Calcium (Ca) bilirubinate, palmitate, phosphate, and carbonate occurring in gallstones have variable morphologies but characteristic windowless energy dispersive x-ray (EDX) spectra. Previous studies of gallstone microstructure and composition using scanning electron microscopy (SEM) with EDX have been limited to dehydrated samples. In this state, Ca bilirubinates appear as either glassy masses, which predominate in black pigment stones, or as clusters, which are found mostly in cholesterol gallstones. The three polymorphs of Ca carbonate, calcite, vaterite, and aragonite, have been identified in gallstones by x-ray diffraction, however; the morphologies of these crystals vary in the literature. The purpose of this experiment was to study fresh gallstones by environmental SEM (ESEM) to determine if dehydration affects gallstone Ca salt morphology.Gallstones and bile were obtained fresh at cholecystectomy from 6 patients. To prevent dehydration, stones were stored in bile at 37°C. All samples were studied within 4 days of procurement.

Sign in / Sign up

Export Citation Format

Share Document