Role of various defects in the photoluminescence characteristics of nanocrystalline Nd2Zr2O7: an investigation through spectroscopic and DFT calculations

2016 ◽  
Vol 4 (22) ◽  
pp. 4988-5000 ◽  
Author(s):  
Santosh K. Gupta ◽  
K. Sudarshan ◽  
P. S. Ghosh ◽  
A. P. Srivastava ◽  
S. Bevara ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Oxygen Vacancies ◽  
Combustion Method ◽  
Gel Combustion ◽  
First Time ◽  
Gel Combustion Method

Photoluminescence in the blue and green regions is observed for the first time in nanocrystals of Nd2Zr2O7 synthesized by gel combustion method. This emission is attributed to the presence of oxygen vacancies.

scholarly journals Limited solid solution Li(Ni0,33Mn0,33Co0,33)1-xFexO2 with structure α-NAFEO2

2019 ◽  
Vol 486 (3) ◽  
pp. 312-315
Author(s):  
M. N. Smirnova ◽  
M. A. Kop’eva ◽  
G. D. Nipan ◽  
G. E. Nikiforova ◽  
Y. M. Volfkovich ◽  
...  
Keyword(s):  
Solid Solution ◽  
Lithium Ion ◽  
Combustion Method ◽  
Homogeneity Region ◽  
Homogeneous Sample ◽  
Limited Solid Solution ◽  
Electrochemical Testing ◽  
Gel Combustion ◽  
First Time ◽  
Gel Combustion Method

In the framework of this work, the compositions Li (Ni0.33Mn0.33Co0.33)1-xFexO2 (0 ≤ x ≤ 1) of the tetrahedron LiNiO2-LiMnO2-LiCoO2-LiFeO2 were investigated. The samples were synthesized by the gel combustion method with starch. For the first time it was obtained without admixtures LiNi0.2Mn0.2Co0.2Fe0.4O2 solid solution with a layered crystalline structure a-NaFeO2, which can be used as a cathode material of lithium-ion batteries. An electrochemical testing of the homogeneous sample LiNi0.2Mn0.2Co0.2Fe0.4O2 and the sample with a minimum iron content LiNi0.3Mn0.3Co0.3Fe0.1O2 was conducted. The results show feasibility of further studying the homogeneity region and the properties of the solid solution Li (Ni, Mn, Co, Fe)O2.

Li(Ni1/3Co1/3Mn1/3)O2 with High Rate Capability Synthesized via a Novel Gel-Combustion Method

2011 ◽  
Vol 391-392 ◽  
pp. 973-977
Author(s):  
Jing Mao ◽  
Ke Hua Dai ◽  
Yu Chun Zhai
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Rate Capability ◽  
Chelating Agent ◽  
Combustion Method ◽  
Xrd Analysis ◽  
High Rate ◽  
High Rate Capability ◽  
Sem Images ◽  
Gel Combustion ◽  
Gel Combustion Method

Li(Ni1/3Co1/3Mn1/3)O2material with high rate capability was synthesized by a novel gel-combustion method using polyvinylpyrrolidone as a polymer chelating agent and a fuel. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to study the structure, morphology and element distribution of the Li(Ni1/3Co1/3Mn1/3)O2material. XRD analysis showed that all samples were α-NaFeO2structure and Li(Ni1/3Co1/3Mn1/3)O2prepared at 900 °C had the highest c/a of 4.977 indicating the highest layered-ness. EDS scan demonstrated that the precursor was homogeneous. SEM images indicated all samples were well crystallized. Charge and discharge tests showed all samples had good rate capability. Among them, Li(Ni1/3Co1/3Mn1/3)O2prepared at 900 °C had the highest capacity and the best rate capability. It delivered 162.1 mAh•g−1at 0.25 C between 2.5 and 4.3 V and the capacity retention was about 81% compared to that of 0.25C rate.

Kinetics of nanocrystalline MgO growth by the sol–gel combustion method

2014 ◽  
Vol 185 ◽  
pp. 86-91 ◽  
Author(s):  
Alexandre R. Bueno ◽  
Renata F.M. Oman ◽  
Paula M. Jardim ◽  
Nicolás A. Rey ◽  
Roberto R. de Avillez
Keyword(s):  
Sol Gel ◽  
Combustion Method ◽  
Gel Combustion ◽  
Kinetics Of ◽  
Gel Combustion Method ◽  
Nanocrystalline Mgo

scholarly journals Synthesis of Blue-Green Phosphors Sr4Si3O8Cl4:Eu2+by Gel-Combustion Method and Their Luminescent Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yong-Qing Zhai ◽  
Li-Li Wang ◽  
Juan Chen ◽  
Shi-Hua Feng
Keyword(s):  
Broad Band ◽  
Orthorhombic Phase ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Main Peak ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
Gel Combustion ◽  
Main Emission Peak ◽  
Gel Combustion Method

Sr4Si3O8Cl4:Eu2+blue-green phosphors were synthesized by the gel-combustion method. The as-synthesized phosphors were analyzed and characterized by X-ray diffraction and fluorescence spectrophotometer. The results indicate that orthorhombic phaseSr4Si3O8Cl4:Eu2+has been formed after the precursor calcined at 900°C reductive temperature. The excitation spectrum ofSr4Si3O8Cl4:Eu2+is a broad band in the range of 250 ~ 450 nm and the main peak at 324 nm. The emission spectrum is also a broad band with the main emission peak at about 484 nm, which is ascribed to the typical 4f5d1to 4f7transition ofEu2+. Moreover, the effects of the concentration ofEu2+, the reductive temperature, and the doping amount ofMg2+on luminescent properties were discussed.

Synthesis of nanocrystalline Ca2Cu2Fe12O22 Y-type hexaferrites by the sol–gel combustion method in metal nitrates system

2018 ◽  
Vol 526 (1) ◽  
pp. 187-192 ◽  
Author(s):  
S. B. Bankar ◽  
N. S. Meshram ◽  
N. N. Sarkar ◽  
H. S. Ahamad ◽  
S. J. Dhobale ◽  
...  
Keyword(s):  
Sol Gel ◽  
Combustion Method ◽  
Metal Nitrates ◽  
Gel Combustion ◽  
Gel Combustion Method

Low temperature synthesis of wollastonite using sol–gel combustion method: In vitro bioactivity evaluation

2019 ◽  
Vol 33 (10) ◽  
pp. 1950081 ◽  
Author(s):  
Madeeha Riaz ◽  
Rehana Zia ◽  
Snudia Aslam ◽  
Alliya Qamar ◽  
Tousif Hussain ◽  
...  
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Combustion Method ◽  
Calcium Nitrate Tetrahydrate ◽  
In Vitro Bioactivity ◽  
Nitrate Tetrahydrate ◽  
Gel Combustion ◽  
Gel Combustion Method

In this paper, low temperature, economical sol–gel combustion method was adopted to synthesize wollastonite ceramic. Calcium nitrate tetrahydrate and tetraethyl orthosilicate were taken as source for Ca and Si, while citric acid and nitric acid were used as chelating/combustion agents. The yielded powder calcined at 600[Formula: see text]C for 4 h was characterized by FTIR, XRD and SEM techniques. Results showed that the citrate combustion method was the most efficient method to prepare wollastonite at low temperature. Moreover, in vitro bioactivity test performed in simulated body fluid (SBF) showed good bioactivity of synthesized wollastonite ceramics.

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