Mössbauer effects and XRD analysis of the solid solution formed from mixtures of different metal oxides by 800°C activation

1992 ◽  
Vol 69 (1-4) ◽  
pp. 791-794
Author(s):  
J. S. Zheng ◽  
J. Liu ◽  
X. X. Chen ◽  
Z. X. Zhan ◽  
Y. L. Xu
Keyword(s):  
Solid Solution ◽  
Metal Oxides ◽  
Xrd Analysis

Fabrication and Magnetic Properties of Mullite Based Nanocomposites with Embedded FeCr Alloy Nanoparticles

2006 ◽  
Vol 510-511 ◽  
pp. 286-289
Author(s):  
Hao Wang ◽  
Wei Min Wang ◽  
Zheng Yi Fu ◽  
Tohru Sekino ◽  
Koichi Niihara
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Alloy Nanoparticles ◽  
Fecr Alloy ◽  
Acid Washing ◽  
Property Measurement ◽  
Nanocomposite Powders

Mullite-based nanocomposites with embedded FeCr alloy nanoparticles were synthesized by reduction of sol-gel prepared Al5.4(Fe0.8Cr0.2)0.6Si2O13 solid solution in hydrogen. The feature of the formation of FeCr alloy is characterized by XRD analysis. Structural characterization revealed that the intragranular FeCr alloy nanoparticles along with inter-granular iron grains were obtained in as reduced sample. After acid washing, the intergranular metal grains were eliminated. The static magnetic properties of nanocomposite powders were studied using Magnetic Property Measurement System. It is found that part of the intra-granular metal nanoparticles have superparamagnetic behavior at room temperature.

scholarly journals The Effect of Cu Doping on the Transformation from Rutile to Anatase and Cu Occupation Tendency in TiO2 Solid Solution

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Jun-Yu Chen ◽  
Ji-Kang Yan ◽  
Guo-You Gan
Keyword(s):  
Solid Solution ◽  
Fourier Transform ◽  
Sol Gel ◽  
Calculated Data ◽  
Xrd Analysis ◽  
Vibration Frequencies ◽  
X Ray Diffraction ◽  
Cu Doping ◽  
X Ray ◽  
Stretching Vibration

TiO2 doped with different amounts of Cu2+ ions (from 0 to 3 mol%) was synthesized by sol-gel method. The samples were characterized by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). The XRD analysis showed that the Cu-doped TiO2 samples exhibit anatase and rutile phases. The lattice parameters remain unchanged, independent of Cu2+ content. Diameter of TiO2 increased significantly with increasing concentrations of Cu2+. The investigated results indicate that a greater portion of the Cu2+ ions are well incorporated into the anatase and rutile TiO2 lattices. The stretching vibration frequencies of the interatomic bonds were calculated by the electronegativity principle. The calculated data were compared with infrared spectra. The results show that in the rutile and anatase phases, O atoms in the TiO2 lattice and some interstitial Cu atoms form Cu-O bond, and other substitutional Cu that replaces Ti atoms in TiO2 lattice form Cu-O bond with O atoms in the TiO2 lattice.

Effect of Ti, Al and Cu Addition on Structural Evolution and Phase Constitution of FeCoNi System Equimolar Alloys

2012 ◽  
Vol 724 ◽  
pp. 335-338 ◽  
Author(s):  
Xiao Wang ◽  
Hui Xie ◽  
Lei Jia ◽  
Zhen Lin Lu
Keyword(s):  
Solid Solution ◽  
Structural Evolution ◽  
Atomic Radius ◽  
Xrd Analysis ◽  
Entire Solution ◽  
Vacuum Arc ◽  
Mixing Enthalpy ◽  
Phase Constitution ◽  
Mixing Entropy ◽  
Coarse Dendrite

FeCoNi system equimolar alloys were fabricated by a vacuum arc melting. The phase constitution of FeCoNi system alloys was determined by XRD analysis and the microstructure was observed by OM. The comprehensive atomic radius δ, the mixing enthalpy ΔHmix and the mixing entropy ΔSmix of alloys were also calculated according to relevant equations. The results show that the addition of Ti, Al and Cu has an obvious influence on the microstructure and phase constitution of FeCoNi system equimolar alloys. Single Ti addition resulted in almost entire solid solution with a typical dendrite growth character and a little unknown phase. However, further addition of Al, Cu or Al+Cu into the FeCoNiTi equimolar alloys led to the occurrence of an entire solution phase with dendrite, coarse dendrite, and rosette dendrite respectively. Such a phenomena suggested that the mixing entropy caused by the increase of components number rather than the comprehensive atomic radius between the elements or the mixing enthalpy of the alloy systems might be responsible for the formation of almost entire solid solution in FeCoNi system equimolar alloys.

A convenient route for the synthesis of complex metal oxides employing solid-solution precursors

1984 ◽  
Vol 23 (9) ◽  
pp. 1206-1210 ◽  
Author(s):  
K. Vidyasagar ◽  
J. Gopalakrishnan ◽  
C. N. R. Rao
Keyword(s):  
Solid Solution ◽  
Metal Oxides ◽  
Complex Metal ◽  
Complex Metal Oxides ◽  
Convenient Route

Thermal Stability Study of Ce0.75-Zr0.25O Nanostructures Synthesized via Water-in-Oil Microemulsion Method

2013 ◽  
Vol 701 ◽  
pp. 207-211 ◽  
Author(s):  
Nur Azrani M. Jani ◽  
Abdul Hadi ◽  
Kamariah Noor Ismail
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Solid Solution ◽  
Elevated Temperatures ◽  
Xrd Analysis ◽  
Oxygen Storage ◽  
Microemulsion Method ◽  
Surface Areas ◽  
Wide Range ◽  
Three Way Catalyst

Fundamentally, ceria particle had ability to store, transport and release oxygen, which was identified as oxygen storage capacity (OSC). Due to this OSC ability, ceria became the most important component in the three-way catalyst. With the addition of zirconia into the ceria resulting in better performance in three-way catalyst as it increased or improved thermal stability and also promotes the redox properties. This study was conducted to investigate the effects of heat treatment on the structure and physical property of nanocrystalline Ce-Zr-O solid solution. Microemulsion method was used for preparation of Ce-Zr-O solid solution, and heat treatment investigation was applied towards the synthesized nanocrystalline Ce-Zr-O solid solution. The phase and crystal structure of Ce-Zr-O solid solution were determined using XRD analysis. While, the modification of surface area and porosity size over the wide range of calcination temperatures range from 300°C to 700°C was investigated using BET Analyzer. XRD analysis confirmed the Ce0.75Zr0.25O2 solid solution was succesfully synthesized in the research. The results exhibited the effect of heat treatment on the decreasing of surface areas and porosity profiles of the Ce0.75Zr0.25O2. Despite of the reduction of surface areas at elevated temperatures, the study found the promising results that the enhancement of thermal stability of ceria by addition of zirconia.

Equilibrium phase diagrams for the systems PbO–SrO–CuO and PbO–CaO–SrO

1990 ◽  
Vol 5 (7) ◽  
pp. 1397-1402 ◽  
Author(s):  
Hitoshi Kitaguchi ◽  
Jun Takada ◽  
Kiichi Oda ◽  
Yoshinari Miura
Keyword(s):  
Solid Solution ◽  
Equilibrium Phase ◽  
Xrd Analysis ◽  
Hexagonal Structure ◽  
Lattice Parameters ◽  
Subsolidus Phase ◽  
Essential Information ◽  
Solubility Range ◽  
Subsolidus Phase Equilibrium ◽  
Typical Composition

In order to obtain essential information on the formation process of the high-Tc phase in the Bi, Pb–Sr–Ca–Cu–O system, subsolidus phase equilibrium in the systems PbO(PbO2)–SrO–CuO and PbO(PbO2)–CaO–SrO has been studied, mainly by XRD analysis. A pseudoternary Pb–Sr–Cu–O solid solution was newly found. This solid solution has a wide solubility range including its typical composition Pb2.03Sr3Cu0.73O7.70. It has a hexagonal structure with lattice parameters a = 10.11 and c = 7.11 in AU. Composition dependences of the lattice parameters and the decomposition (incongruent melting) temperature of (Ca1−xSrx)2PbO4 solid solution are also reported.

Sign in / Sign up

Export Citation Format

Share Document