Electron Microscopy investigation of Sb 2-x Bi x Te 3 hexagonal crystal structure growth prepared from sol–gel method

Abstract Un-doped and ZnAlxO(1.5x + 1):0.1% Tb3+ (ZAOT) nano-powders were synthesized via citrate sol-gel method. The Alx moles were varied in the range of 0.25 ≤ x ≤ 5.0. The X-ray powder diffraction (XRD) data revealed that for the x < 1.5, the prepared samples crystal structure consists of mixed phases of the cubic ZnAl2O4 and hexagonal ZnO phases, while for the x ≥ 1.5 the structure consists of single phase of cubic ZnAl2O4. This was confirmed by the Raman and Fourier-Transform Infrared (FTIR) vibrational spectroscopy. Scanning electron microscopy (SEM) showed that varying Alx moles influences the morphology while Transmission electron microscopy (TEM) shows the dual morphology at x < 1.5. The photoluminescence (PL) revealed intense and distinct emissions attributed to both the host and Tb3+ transitions. The emission intensity highly depends on the Alx moles. The International Commission on Illumination (CIE) colour chromaticity showed that the emission colour could be tuned by varying the Alx moles.

Download Full-text

Synthesis of La-Mn Substituted M-Type Ba Hexaferrites by Sol-Gel Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.688 ◽

2007 ◽

Vol 336-338 ◽

pp. 688-691 ◽

Cited By ~ 2

Author(s):

Zhi Dong Han ◽

Li Min Dong ◽

Ze Wu ◽

Lian Wei Shan ◽

Xian You Zhang

Keyword(s):

Crystal Structure ◽

Citric Acid ◽

Sol Gel ◽

Ftir Analysis ◽

Hexagonal Crystal ◽

Forming Process ◽

Gel Method ◽

Sol Gel Method ◽

Oxygen Bond ◽

Similar Crystal Structure

BaFe12O19 and La-Mn substituted M-type Ba hexaferrites were synthesized by sol-gel method and characterized by XRD, SEM and FTIR. The results showed that citric acid played an important role in the forming process of BaFe12O19. BaFe12O19, synthesized under lower citric acid and presintered at 450°C, showed improved hexagonal crystal phase. BaLa0.5Fe11.5O19 and Ba(MnLa)0.5Fe11O19 showed similar crystal structure to BaFe12O19 while Ba0.5Mn0.5Fe12O19 and Ba0.5Mn0.5La0.5Fe11.5O19 showed changed crystal constant. FTIR analysis proved the formation of new mental-oxygen bond in substituted hexaferrites.

Download Full-text

High-Resolution Electron Microscopy on Epitaxial Pb(Mg1/3Nb2/3)O3Film Prepared by Sol-Gel Method

Japanese Journal of Applied Physics ◽

10.1143/jjap.30.l1052 ◽

1991 ◽

Vol 30 (Part 2, No. 6A) ◽

pp. L1052-L1055 ◽

Cited By ~ 19

Author(s):

Kumi Okuwada ◽

Shin-ichi Nakamura ◽

Motomasa Imai ◽

Keiichi Kakuno

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Sol Gel ◽

High Resolution Electron Microscopy ◽

Gel Method ◽

Sol Gel Method ◽

Resolution Electron

Download Full-text

Synthesis, crystal structure and photoluminescence properties of Eu2+-activated RbCaGd(PO4)2 phosphors

RSC Advances ◽

10.1039/c5ra25124a ◽

2016 ◽

Vol 6 (14) ◽

pp. 11211-11217 ◽

Cited By ~ 4

Author(s):

Xue Chen ◽

Qidi Wang ◽

Fengzhu Lv ◽

Paul K. Chu ◽

Yihe Zhang

Keyword(s):

Crystal Structure ◽

Sol Gel ◽

Dipole Interaction ◽

Concentration Quenching ◽

Photoluminescence Properties ◽

Gel Method ◽

Sol Gel Method ◽

First Time

RbCaGd(PO4)2:Eu2+ was prepared by the Pechini-type sol–gel method. The crystal structure was determined in the first time. The dipole–dipole interaction plays a major role in the mechanism of concentration quenching of Eu2+ in this phosphor.

Download Full-text

Magnetic PbFe12O19-TiO2 nanocomposites and their photocatalytic performance in the removal of toxic pollutants

Main Group Metal Chemistry ◽

10.1515/mgmc-2017-0055 ◽

2018 ◽

Vol 41 (3-4) ◽

pp. 53-62 ◽

Cited By ~ 2

Author(s):

Behnaz Lahijani ◽

Kambiz Hedayati ◽

Mojtaba Goodarzi

Keyword(s):

Electron Microscopy ◽

Photocatalytic Performance ◽

Sol Gel ◽

Precipitation Method ◽

X Ray Diffraction ◽

Gel Method ◽

Sol Gel Method ◽

Photocatalytic Effect ◽

Transmission Electron ◽

Ultraviolet Light Irradiation

Abstract In this work, the PbFe12O19 nanoparticles were prepared by the simple and optimized precipitation method with different organic surfactants and capping agents. In the next step, the TiO2 nanoparticles were synthesized using the sol-gel method. At the final step, the PbFe12O19-TiO2 nanocomposites were prepared via the sol-gel method. The effect of the precipitating agent on the morphology and particle size of the products was investigated. The prepared products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The results obtained by the vibrating sample magnetometer show the magnetic properties of the ferrite nanostructures. The photocatalytic effect of the PbFe12O19-TiO2 nanocomposite on the elimination of the azo dyes (acid black, acid violet and acid blue) under ultraviolet light irradiation was evaluated. The results indicate that the prepared nanocomposites have acceptable magnetic and photocatalytic performance.

Download Full-text

Crystal structure and highly enhanced ferroelectric properties of (Tb, Cr) co-doped BiFeO3 thin films fabricated by a sol–gel method

Ceramics International ◽

10.1016/j.ceramint.2013.07.099 ◽

2014 ◽

Vol 40 (1) ◽

pp. 1919-1925 ◽

Cited By ~ 35

Author(s):

Guohua Dong ◽

Guoqiang Tan ◽

Wenlong Liu ◽

Ao Xia ◽

Huijun Ren

Keyword(s):

Crystal Structure ◽

Thin Films ◽

Ferroelectric Properties ◽

Sol Gel ◽

Gel Method ◽

Sol Gel Method ◽

Bifeo3 Thin Films ◽

Co Doped

Download Full-text

Nanosized TiO2Photocatalyst Powder via Sol-Gel Method: Effect of Hydrolysis Degree on Powder Properties

International Journal of Photoenergy ◽

10.1155/2009/962783 ◽

2009 ◽

Vol 2009 ◽

pp. 1-8 ◽

Cited By ~ 32

Author(s):

Nor Hafizah ◽

Iis Sopyan

Keyword(s):

Crystal Structure ◽

Surface Area ◽

Sol Gel ◽

Xrd Analysis ◽

Gel Method ◽

Sol Gel Method ◽

Hydrolysis Degree ◽

Method Effect ◽

Powder Properties ◽

Dta Curves

NanosizedTiO2powder was synthesized via sol-gel method using titanium tetraisopoxide (TPT) as the precursor. Mol ratios of water to TPT were varied from 1 (Powder A), 2 (Powder B), 3 (Powder C), and 4 (Powder D) to evaluate effect of hydrolysis degree. TG/DTA curves showed that amorphous phase turned to anatase crystal structure at ca. 415, 337, 310, and339∘C for Powders A, B, C, and D, respectively. XRD analysis showed that all the synthesizedTiO2powders were 100% in anatase form with Powders B and C showing considerably higher crystallinities. The powders obtained at lower water to TPT mol ratios were spherical in shape and they became bar-like shapes higher mol ratios. The lower hydrolysis degree led to higher surface area of the Powder A (24.8 m2/g) compared to Powder B (14.6 m2/g). From phenol photocatalytic measurement, Powder B was the most efficient attributed to its higher crystallinity.

Download Full-text

Iron-Zircon Pigments Prepared by Non-Hydrolytic Sol-Gel Method at Low Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.412.223 ◽

2011 ◽

Vol 412 ◽

pp. 223-226 ◽

Cited By ~ 6

Author(s):

Wei Hui Jiang ◽

Yan Hui Yang ◽

Qing Xia Zhu ◽

Jian Min Liu

Keyword(s):

Crystal Structure ◽

Low Temperature ◽

Ferric Chloride ◽

Lithium Fluoride ◽

Sol Gel ◽

Zircon Crystal ◽

Molar Ratio ◽

Gel Method ◽

Sol Gel Method ◽

Anhydrous Ferric Chloride

ron-zircon pigment has been synthesized by non-hydrolytic sol-gel method using zirconium chloride and tetraethoxysilane as precursors, anhydrous ferric chloride as colorant, lithium fluoride as mineralizer and anhydrous ethanol as solvent. Iron-zircon pigment has been characterized by means of DTA-TG, XRD, Colorimeter and TEM. The results show that only a small fraction of iron is incorporated in the zircon crystal structure while the remaining iron cations are trapped within the zircon matrix. The iron-zircon with the red value (a*) of 20.64 can be synthesized at 700°C with the optimum Fe/Zr molar ratio of 0.2.

Download Full-text