X-Ray powder diffraction study of a new vanadium oxide Cr0.11V2O5.16 synthesized by a sol–gel process

Using tetraethoxysilane, aluminum nitrate and aluminum fluoride as raw materials, the precursor of mullite was prepared by sol-gel process. When the precursor sintered at 1200°C, mullite ceramic was obtained. Differential thermal analysis, X-ray powder diffraction and scanning electron microscope were used to characterize the dried mullite gel and ceramic blocks. The results suggest mullite is synthesized by solid-phase reaction mechanism. X-ray powder diffraction indicates mullite is the main crystals phase in the ceramic specimen. SEM micrograph shows the mullite grains in the shape of short rod with length of 20 um when sintered at 1200 °C for 2 h and the grains grown up to acicular with length of more than 50 um when the treating time under 1200 °C achieved to 4 h.

Download Full-text

Sol-Gel Derived Mullite-Gahnite Composite

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.87.126 ◽

2014 ◽

Vol 87 ◽

pp. 126-131

Author(s):

Stanislav Kurajica ◽

Emilija Tkalčec ◽

Vilko Mandić ◽

Iva Lozić ◽

Jörg Schmauch

Keyword(s):

Thermal Analysis ◽

Differential Thermal Analysis ◽

Powder Diffraction ◽

Sol Gel ◽

Intermediate Formation ◽

X Ray ◽

Thermal Reactions ◽

Sol Gel Process ◽

Crystal Phases ◽

Crystallization Path

Mullite-gahnite composites with different phase-proportions were prepared using sol-gel process. Crystallization path was determined using differential thermal analysis (DTA). X-ray powder diffraction (XRD) was used to study the crystal phases development. The course of the thermal reactions is dominated by the intermediate formation of two spinel phases. The former phase was attributed to gahnite, while the latter to Al-Si spinel. Zn loading decreases amounts of mullite and α-alumina, while increases gahnite and amorphous phase. The observed microstructure of sintered bodies is characterized by fine gahnite particles distributed among larger mullite grains, which is highly favourable for ceramics with high mechanical requirements.

Download Full-text

Effect of Annealing temperature on the Structural and Magnetic Properties of TbxY3-xFe5O12(x = 0.0, 1.0, 2.0) Thin Films Prepared by Sol-Gel Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.501.236 ◽

2012 ◽

Vol 501 ◽

pp. 236-241 ◽

Cited By ~ 1

Author(s):

Ftema W. Aldbea ◽

Noor Bahyah Ibrahim ◽

Mustafa Hj. Abdullah ◽

Ramadan E. Shaiboub

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Room Temperature ◽

Annealing Temperature ◽

Sol Gel ◽

Vibrating Sample Magnetometer ◽

X Ray ◽

Garnet Phase ◽

Sol Gel Process ◽

Amorphous Structures

Thin films nanoparticles TbxY3-xFe5O12 (x=0.0, 1.0, 2.0) were prepared by the sol-gel process followed by annealing process at various annealing temperatures of 700° C, 800° C and 900° C in air for 2 h. The results obtained from X-ray diffractometer (XRD) show that the films annealed below 900°C exhibit peaks of garnet mixed with small amounts of YFeO3 and Fe2O3. Pure garnet phase has been detected in the films annealed at 900°C. Before annealing the films show amorphous structures. The particles sizes measurement using the field emission scanning electron microscope (FE-SEM) showed that the particles sizes increased as the annealing temperature increased. The magnetic properties were measured at room temperature using the vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of the films also increased with the annealing temperature. However, different behavior of coercivity (Hc) has been observed as the annealing temperature was increased.

Download Full-text

The Cubic/Tetragonal Phase Transition in D3C–THF: an Optical and X-ray Powder Diffraction Study

Journal of Solid State Chemistry ◽

10.1006/jssc.1997.7720 ◽

1998 ◽

Vol 137 (1) ◽

pp. 87-93 ◽

Cited By ~ 4

Author(s):

K. Knorr ◽

W. Depmeier

Keyword(s):

Phase Transition ◽

Diffraction Study ◽

Powder Diffraction ◽

Tetragonal Phase ◽

X Ray ◽

Tetragonal Phase Transition

Download Full-text

Luminescent Properties of Zn2SiO4:Eu3+,Dy3+ Phosphors via Sol-Gel Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.217-219.733 ◽

2012 ◽

Vol 217-219 ◽

pp. 733-736

Author(s):

Xiu Mei Han ◽

Shu Ai Hao ◽

Ying Ling Wang ◽

Gui Fang Sun ◽

Xi Wei Qi

Keyword(s):

Thermal Analysis ◽

Ir Spectra ◽

Sol Gel ◽

Luminescent Properties ◽

Photoluminescence Spectra ◽

X Ray Diffraction ◽

X Ray ◽

Sol Gel Process ◽

Ft Ir

Zn2SiO4:Eu3+, Dy3+ phosphors have been prepared through the sol-gel process. X-ray diffraction (XRD), thermogravimetric and ddifferential thermal analysis (TG-DTA), FT-IR spectra and photoluminescence spectra were used to characterize the resulting phosphors. The results of XRD indicated that the phosphors crystallized completely at 1000oC. In Zn2SiO4:Eu3+,Dy3+ phosphors, the Eu3+ and Dy3+ show their characteristic red(613nm, 5D0-7F2), blue (481nm, 4F9/2–6H15/2) and yellow (577nm, 4F9/2–6H13/2) emissions.

Download Full-text

Structural evolution of NASICON-type Li1+xAlxGe2−x(PO4)3 using in situ synchrotron X-ray powder diffraction

Journal of Materials Chemistry A ◽

10.1039/c6ta00402d ◽

2016 ◽

Vol 4 (20) ◽

pp. 7718-7726 ◽

Cited By ~ 39

Author(s):

Dorsasadat Safanama ◽

Neeraj Sharma ◽

Rayavarapu Prasada Rao ◽

Helen E. A. Brand ◽

Stefan Adams

Keyword(s):

Solid Electrolyte ◽

Diffraction Study ◽

Powder Diffraction ◽

Structural Evolution ◽

X Ray Diffraction ◽

X Ray ◽

Nasicon Type ◽

Precursor Glass

In situ synchrotron X-ray diffraction study of the synthesis of solid-electrolyte Li1+xAlxGe2−x(PO4)3 (LAGP) from the precursor glass reveals that an initially crystallized dopant poor phase transforms into the Al-doped LAGP at 800 °C.

Download Full-text