Effects of Mn4+ Doping on the Phase Composition, Crystal Structure and Light Reflective Property of SmAlO3

2017 ◽  
Vol 9 (4) ◽  
pp. 583-585 ◽  
Author(s):  
Pengde Han ◽  
Yiqing Zhu ◽  
Tianjing Li ◽  
Qingle Shi ◽  
Qitu Zhang
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Reflective Property

scholarly journals Люминофоры холодного голубого излучения на основе оксида алюминия, допированного диспрозием

2022 ◽  
Vol 64 (1) ◽  
pp. 95
Author(s):  
И.В. Бакланова ◽  
В.Н. Красильников ◽  
А.П. Тютюнник ◽  
Я.В. Бакланова
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Powder Diffraction ◽  
Thermal Quenching ◽  
Emission Spectra ◽  
X Ray ◽  
White Emission ◽  
Uv Excitation ◽  
Quenching Of Luminescence

Al2О3:Dy3+ oxides with different colors luminescence were synthesized using precursor technology. The phase composition and crystal structure of the obtained materials were established by X-ray powder diffraction analysis. The excitation and emission spectra, decay curves, thermal quenching of luminescence were studied. Under UV excitation, the phosphors exhibit blue, purplish blue, white emission depending on the concentration of dysprosium and the temperature of annealing of the Al1-xDyx(OH)(HCOO)2 precursor in air.

Crystal structure, phase composition and microwave dielectric properties of Ca3MSi2O9 ceramics

2018 ◽  
Vol 750 ◽  
pp. 996-1002 ◽  
Author(s):  
Xiao-Qiang Song ◽  
Kang Du ◽  
Xian-Zhe Zhang ◽  
Jie Li ◽  
Wen-Zhong Lu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
Structure Phase

scholarly journals Improving the properties of Li4Ti5O12 - a promising anode material for lithium-ion batteries

2019 ◽  
Vol 108 ◽  
pp. 01018
Author(s):  
Danuta Olszewska ◽  
Jakub Niewiedział ◽  
Jakub Boczkowski
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Specific Capacity ◽  
Stoichiometric Composition ◽  
Computer Software ◽  
Lithium Ion ◽  
Lithium Carbonate ◽  
Cycle Performance ◽  
High Specific Capacity ◽  
Voltage Range

Two materials with the stoichiometric composition Li3.85Ni0.15Ti5O12 and Li3.80Cu0.05Ni0.15Ti5O12 were obtained by solid-state reaction using lithium carbonate Li2CO3, titanium oxide TiO2, nickel oxide NiO and copper oxide CuO. The materials were characterized in terms of phase composition, crystal structure as well as cycle performance. Phase composition and crystal structure parameters were determined using X-ray Panalytical Empyrean XRD diffractometer in the range of 10-110° with CuKa radiation. The results were analyzed using Rietveld refinement which was then implemented in the GSAS computer software. The electrochemical properties of the samples were measured by galvanostatic charge/discharge cycles at different rates over a voltage range of 1.0-2.5 V and 0.2-2.5 V. Cyclic voltammetry measurements were also carried out. It was proved that the addition of both Ni and Cu results in high specific capacity of LTO especially at high current rates (2C and 5C). The sample Li3.80Cu0.05Ni0.15Ti5O12 delivers superior capacity above 200 mAh·g -1 when discharged to 0.2 V.

Accuracy of XRPD QPA using the combined Rietveld–RIR method

2000 ◽  
Vol 33 (2) ◽  
pp. 267-278 ◽  
Author(s):  
Alessandro F. Gualtieri
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Incoherent Scattering ◽  
Quantitative Phase Analysis ◽  
Polycrystalline Materials ◽  
Structure Model ◽  
Thermal Displacement ◽  
Model Assumption ◽  
Pyroclastic Rocks ◽  
X Ray

QPA (quantitative phase analysis) of polycrystalline materials using XRPD (X-ray powder diffraction) can be performed using the combined Rietveld and reference intensity ratio (RIR) methods, providing an estimate of both the crystalline and the amorphous phase in a mixture. Although the accuracy of estimates of the phase composition of simple ternary or quaternary mixtures is generally very good, uncertainties remain and bias the accuracy of phase determinations in complex systems such as pyroclastic rocks, which may contain two or more zeolite species, a number of other phases (generally up to four or five), and glass. The contribution of the incoherent scattering, biasing accuracy, in the glass determination has been discussed in an earlier work on the modal analysis of pyroclastic rocks [Gualtieri (1996).Powder Diffr.11, 97–106]. In this work, the assumption of the crystal structure, the influence of the spike addition, background and atomic (thermal) displacement parameters are discussed. It is shown that the structure-model assumption no longer holds for systems containing complex phases such as zeolites, as the accuracy is degraded and, as far as the influence of the added spike is concerned, there is an underestimation of the glass content with increasing amounts of added spike.

Phase composition and crystal structure of (La2−yNdy)1−x/2Sr1+xCu2O6 (0⩽x⩽1; 0⩽y⩽2)

1999 ◽  
Vol 289 (1-2) ◽  
pp. 48-54 ◽  
Author(s):  
H Deng ◽  
C Dong ◽  
J.C Shen ◽  
H Chen ◽  
F Wu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Composition

The Study of Ingots and Deformed Semi-Finished Products of Al-Mg-Sc and Al-Cu-Li Alloys Using Diffraction Methods

2016 ◽  
Vol 877 ◽  
pp. 471-476 ◽  
Author(s):  
Boris Ovsyannikov ◽  
Olga Chikova ◽  
Pavel Reznik
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Phase Composition ◽  
Structure Phase ◽  
The Difference ◽  
Annealing Mode

The influence of Al-Mg-Sc ingots and Al-Cu-Li semi-finished products heat treatment modes on structure, phase composition, and crystal structure was studied. Based on EBSD and EDS data, the difference of the sample microstructures was detected and the most favorable annealing mode for further deformation was presumed.

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