Preferential site occupancy of Ni ions and oxidation state of Fe ions in the YIG crystal structure obtained by sol-gel method

2020 ◽  
Vol 849 ◽  
pp. 156657
Author(s):  
J.P. Caland ◽  
Cynthia P.C. Medrano ◽  
A. Caytuero ◽  
E. Baggio-Saitovitch ◽  
F.J. Litterst ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Oxidation State ◽  
Sol Gel ◽  
Site Occupancy ◽  
Gel Method ◽  
Sol Gel Method ◽  
Preferential Site ◽  
Fe Ions

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

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11211-11217 ◽  
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.

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

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
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.

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

2011 ◽  
Vol 412 ◽  
pp. 223-226 ◽  
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.

Preparation of TiO2 Thin Films by Sol-Gel Method and Analysis of its Transmittance Based on Computer Image Processing

2020 ◽  
Vol 842 ◽  
pp. 121-126
Author(s):  
Ji Hui Luo ◽  
Qiu Yue Wen ◽  
Shu Liu ◽  
Ting Liu ◽  
Su Ting Wei ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Sol Gel ◽  
Light Transmittance ◽  
Anatase Structure ◽  
Gel Method ◽  
Sol Gel Method ◽  
Computer Image Processing ◽  
Imagej Software

TiO2 films were prepared by sol-gel method with butyl titanate, anhydrous ethanol, acetyl acetone and hydrochloric acid as raw materials, which were sintered at 380 °C and 530 °C respectively to obtain TiO2 films. XRD was used for analyzing the crystal structure of TiO2 film, and ImageJ software was used to detect the light transmittance of TiO2 film samples. The results show that the film sintered at 530 °C is brookite structure and the film sintered at 380 °C is anatase structure. The increase of sintering temperature is not conducive to the growth of TiO2 film grains. TiO2 films sintered at 380 °C have good light transmittance.

Search the Hard Magnetic Tetrataenite Phase in the Fragments of Chelyabinsk Meteorite

2016 ◽  
Vol 845 ◽  
pp. 265-268
Author(s):  
Sergey Taskaev ◽  
Konstantin Skokov ◽  
Dmitriy Karpenkov ◽  
Elena M. Semenova ◽  
Vladimir V. Khovaylo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Particles ◽  
Sol Gel ◽  
Magnetic Domains ◽  
Gel Method ◽  
Chelyabinsk Meteorite ◽  
Sol Gel Method

Few Fe-Ni particles with composition close 50:50 were found by EDX and SEM investigations in the fragment of Chelyabinsk meteorite. These inclusions were extracted and magnetic domains were observed with the help of sol-gel method. No hard magnetic particles with tetragonal L10 crystal structure (tetrataenite) were detected.

scholarly journals Evaluation of La1−xSrxMnO3 (0 ≤ x < 0.4) synthesised via a modified sol–gel method as mediators for magnetic fluid hyperthermia

CrystEngComm ◽  
2016 ◽  
Vol 18 (3) ◽  
pp. 407-416 ◽  
Author(s):  
K. McBride ◽  
J. Cook ◽  
S. Gray ◽  
S. Felton ◽  
L. Stella ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Fluid ◽  
Sol Gel ◽  
Magnetic Fluid Hyperthermia ◽  
Gel Method ◽  
Sol Gel Method ◽  
Lanthanum Strontium ◽  
Sol Gel Synthesis

A range of lanthanum strontium manganates (La1−xSrxMnO3) where 0 ≤ x ≤ 0.4 were prepared using a modified peroxide sol–gel synthesis. The crystal structure of these materials was investigated and their potential as mediators for magnetic fluid hyperthermia was evaluated.

Composition dependence of phase structure and electrical properties of BiMnO3-modified Bi0.5(Na0.8K0.2)0.5TiO3 thin films

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62713-62718 ◽  
Author(s):  
Peng Li ◽  
Wei Li ◽  
Jiwei Zhai ◽  
Bo Shen ◽  
Huarong Zeng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Electrical Properties ◽  
Phase Structure ◽  
Composition Dependence ◽  
Sol Gel ◽  
Lead Free ◽  
Gel Method ◽  
Sol Gel Method ◽  
Si Substrates

Lead-free (1 − x)Bi0.5(Na0.8K0.2)0.5TiO3-xBiMnO3 (BNKT-xBMO, 0 < x < 0.025) thin films were deposited on Pt/Ti/SiO2/Si substrates by a sol–gel method, and the effects of BiMnO3 addition on the crystal structure and electrical properties were systematically investigated.

Synthesis of ZnO Polycrystalline Flakes Using Sol-Gel Method

2011 ◽  
Vol 320 ◽  
pp. 135-139
Author(s):  
Yung Kuan Tseng ◽  
Ming Hung Chuang ◽  
Yen Cheng Chen
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Two Dimensional ◽  
Zno Nanostructures ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Polycrystalline Zinc ◽  
Scanning Electron

This study proposes a novel sol-gel method of fabricating the two-dimensional flakes polycrystalline zinc oxide (ZnO). Apply zinc acetate dehydrate in glycerol and hydrolyzed to get the precursor zinc alkoxide particles at 160°C, and self-assemble into flakes ZnO nanostructures, and then got higer crystallinity polycrystalline ZnO after calcination for one hour at 500°C. Field-emission scanning electron microscopy (FE-SEM) was used to observe the morphology of the flakes. Its size got to a few μm2. Analyze the crystal structure and crystallinity by X-ray powder diffraction (XRD). After calcination for one hour at 500°C, we can determine it is the hexagonal wurtzite structure of ZnO. And TGA/DSC to observe the loss and phase change of the solution. The Study has successfully synthesized ZnO polycrystalline flakes by sol-gel method.

Sign in / Sign up

Export Citation Format

Share Document