Structural evolution during sodium deintercalation/intercalation in Na2/3[Fe1/2Mn1/2]O2

2015 ◽  
Vol 3 (13) ◽  
pp. 6954-6961 ◽  
Author(s):  
Gurpreet Singh ◽  
Juan Miguel López del Amo ◽  
Montserrat Galceran ◽  
Sofía Pérez-Villar ◽  
Teofilo Rojo
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transitions ◽  
Structural Evolution ◽  
Ex Situ

Phase transitions occurring during the (de)intercalation of Na in Na2/3[Fe1/2Mn1/2]O2 have been examined by using in situ XRD and in situ Raman Spectroscopy along with ex situ NMR.

Structural evolution in LiFePO4-based battery materials: In-situ and ex-situ time-of-flight neutron diffraction study

2014 ◽  
Vol 258 ◽  
pp. 356-364 ◽  
Author(s):  
I.A. Bobrikov ◽  
A.M. Balagurov ◽  
Chih-Wei Hu ◽  
Chih-Hao Lee ◽  
Tsan-Yao Chen ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Time Of Flight ◽  
Structural Evolution ◽  
Neutron Diffraction Study ◽  
Ex Situ ◽  
Battery Materials

scholarly journals In-Situ Synthesis and Characterization of Nanocomposites in the Si-Ti-N and Si-Ti-C Systems

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5236
Author(s):  
Maxime Balestrat ◽  
Abhijeet Lale ◽  
André Vinícius Andrade Bezerra ◽  
Vanessa Proust ◽  
Eranezhuth Wasan Awin ◽  
...  
Keyword(s):  
Amorphous Materials ◽  
Structural Evolution ◽  
Ammonia Nitrogen ◽  
Ex Situ ◽  
Mechanistic Study ◽  
X Ray ◽  
Modified Polymer ◽  
Amorphous Network ◽  
The Matrix

The pyrolysis (1000 °C) of a liquid poly(vinylmethyl-co-methyl)silazane modified by tetrakis(dimethylamido)titanium in flowing ammonia, nitrogen and argon followed by the annealing (1000–1800 °C) of as-pyrolyzed ceramic powders have been investigated in detail. We first provide a comprehensive mechanistic study of the polymer-to-ceramic conversion based on TG experiments coupled with in-situ mass spectrometry and ex-situ solid-state NMR and FTIR spectroscopies of both the chemically modified polymer and the pyrolysis intermediates. The pyrolysis leads to X-ray amorphous materials with chemical bonding and ceramic yields controlled by the nature of the atmosphere. Then, the structural evolution of the amorphous network of ammonia-, nitrogen- and argon-treated ceramics has been studied above 1000 °C under nitrogen and argon by X-ray diffraction and electron microscopy. HRTEM images coupled with XRD confirm the formation of nanocomposites after annealing at 1400 °C. Their unique nanostructural feature appears to be the result of both the molecular origin of the materials and the nature of the atmosphere used during pyrolysis. Samples are composed of an amorphous Si-based ceramic matrix in which TiNxCy nanocrystals (x + y = 1) are homogeneously formed “in situ” in the matrix during the process and evolve toward fully crystallized compounds as TiN/Si3N4, TiNxCy (x + y = 1)/SiC and TiC/SiC nanocomposites after annealing to 1800 °C as a function of the atmosphere.

scholarly journals Synthesis of Ceramic Reinforcements in Metallic Matrices during Spark Plasma Sintering: Consideration of Reactant/Matrix Mutual Chemistry

Ceramics ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 592-599
Author(s):  
Dina V. Dudina ◽  
Tomila M. Vidyuk ◽  
Michail A. Korchagin
Keyword(s):  
Spark Plasma Sintering ◽  
Structural Evolution ◽  
Ceramic Composites ◽  
Ex Situ ◽  
Full Density ◽  
Powder Materials ◽  
Plasma Sintering ◽  
Processing Step ◽  
Spark Plasma

Metal–ceramic composites are obtained via ex-situ or in-situ routes. The in-situ route implies the synthesis of reinforcement in the presence of a matrix and is often regarded as providing more flexibility to the microstructure design of composites than the ex-situ route. Spark plasma sintering (SPS) is an advanced sintering method that allows fast consolidation of various powder materials up to full or nearly full density. In reactive SPS, the synthesis and consolidation are combined in a single processing step, which corresponds to the in-situ route. In this article, we discuss the peculiarities of synthesis of ceramic reinforcements in metallic matrices during SPS with a particular consideration of reactant/matrix mutual chemistry. The formation of carbide reinforcements in Cu, Al, and Ni matrices is given attention with examples elaborated in the authors’ own research. Factors determining the suitability of reactive SPS for manufacturing of composites from a matrix/reactants system and features of the structural evolution of the reaction mixture during sintering are discussed.

Ex situ and in situ surface-enhanced Raman spectroscopy for macromolecular profiles of cell nucleus

2019 ◽  
Vol 411 (23) ◽  
pp. 6021-6029 ◽  
Author(s):  
Yanting Shen ◽  
Lixia Yang ◽  
Lijia Liang ◽  
Zhiyuan Li ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Cell Nucleus ◽  
Surface Enhanced Raman Spectroscopy ◽  
Ex Situ ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Humidity-induced phase transitions of ferric sulfate minerals studied by in situ and ex situ X-ray diffraction

2009 ◽  
Vol 94 (11-12) ◽  
pp. 1629-1637 ◽  
Author(s):  
W. Xu ◽  
N. J. Tosca ◽  
S. M. McLennan ◽  
J. B. Parise
Keyword(s):  
Phase Transitions ◽  
Ferric Sulfate ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sulfate Minerals
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