scholarly journals Synthesis and Evaluation of the A-Site Deficient Perovskite La0.65Sr0.3Cr0.85Ni0.15O3-δ as Fuel Electrode for High Temperature Co-Electrolysis Enhanced by In Situ Exsolution of Ni Nanoparticles

2019 ◽  
Vol 91 (1) ◽  
pp. 1751-1760 ◽  
Author(s):  
Diana María Amaya Dueñas ◽  
Guoxing Chen ◽  
Anke Weidenkaff ◽  
Noriko Sata ◽  
Feng Han ◽  
...  
Keyword(s):  
High Temperature ◽  
Ni Nanoparticles ◽  
A Site

Mn-Mg disordering in cummingtonite: a high-temperature neutron powder diffraction study

2000 ◽  
Vol 64 (2) ◽  
pp. 255-266 ◽  
Author(s):  
J. J. Reece ◽  
S. A. T. Redfern ◽  
M. D. Welch ◽  
C. M. B. Henderson
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
New York ◽  
High Temperature ◽  
Powder Diffraction ◽  
Elevated Temperatures ◽  
Neutron Powder Diffraction ◽  
Site Preference ◽  
A Site

AbstractThe crystal structure of a manganoan cummingtonite, composition [M4](Na0.13Ca0.41Mg0.46Mn1.00) [M1,2,3](Mg4.87Mn0.13)(Si8O22)(OH)2, (Z = 2), a = 9.5539(2) Å, b = 18.0293(3) Å, c = 5.2999(1) Å, β = 102.614(2)° from Talcville, New York, has been refined at high temperature using in situ neutron powder diffraction. The P21/m to C2/m phase transition, observed as spontaneous strains +ε1 = −ε2, occurs at ˜107°C. Long-range disordering between Mg2+ and Mn2+ on the M(4) and M(2) sites occurs above 550°C. Mn2+ occupies the M(4) and M(2) sites preferring M(4) with a site-preference energy of 24.6±1.5 kJ mol−1. Disordering induces an increase in XMnM2 and decrease in XMnM4 at elevated temperatures. Upon cooling, the ordered states of cation occupancy are ‘frozen in’ and strains in lattice parameters are maintained, suggesting that re-equilibration during cooling has not taken place.

Synthesis and study of magnetic properties of high temperature stable Ni nanoparticles in a nearly amorphous AlPO4 matrix in an oxidative atmosphere

2014 ◽  
Vol 2 (26) ◽  
pp. 5142-5148 ◽  
Author(s):  
Rajalaxmi Maharana ◽  
M. Manivel Raja ◽  
V. V. Bhanu Prasad ◽  
Pradip Paik ◽  
Subir Roy
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Reducing Agent ◽  
Ni Nanoparticles ◽  
Graphitized Carbon ◽  
Carbon Coated ◽  
Oxidative Atmosphere ◽  
Amorphous Alpo4

Graphitized carbon coated Ni nanoparticles were synthesized in an AlPO4 matrix in situ in an oxidative atmosphere without using any foreign reducing agent.

In situ growth of Pt3Ni nanoparticles on an A-site deficient perovskite with enhanced activity for the oxygen reduction reaction

2017 ◽  
Vol 5 (14) ◽  
pp. 6399-6404 ◽  
Author(s):  
Yang Gao ◽  
Jian Wang ◽  
Yu-Qi Lyu ◽  
Kwunyu Lam ◽  
Francesco Ciucci
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
In Situ Growth ◽  
Ni Nanoparticles ◽  
Enhanced Activity ◽  
Perovskite Material ◽  
A Site

A perovskite material with in situ exsolved Pt3Ni nanoparticles is applied for oxygen reduction reaction catalysis with dramatically improved activity.

A redox-stable chromate cathode decorated with in situ grown nickel nanocatalyst for efficient carbon dioxide electrolysis

2015 ◽  
Vol 5 (3) ◽  
pp. 1929-1940 ◽  
Author(s):  
Cong Ruan ◽  
Kui Xie
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Ni Nanoparticles

Ni nanoparticles are anchored on the surface of a chromate substrate by in situ growth, and significantly improve its performance for high-temperature CO2 electrolysis.

The reaction of amorphous Ni-Nb films with Si in the presence of a native SiO2 layer

1990 ◽  
Vol 48 (4) ◽  
pp. 664-665
Author(s):  
N. Rozhanski ◽  
A. Barg
Keyword(s):  
High Temperature ◽  
Crystallization Temperature ◽  
Diffusion Barriers ◽  
Sio2 Layer ◽  
Si Substrate ◽  
Cross Sectional ◽  
Plan View ◽  
Temperature Range ◽  
Sputter Deposited

Amorphous Ni-Nb alloys are of potential interest as diffusion barriers for high temperature metallization for VLSI. In the present work amorphous Ni-Nb films were sputter deposited on Si(100) and their interaction with a substrate was studied in the temperature range (200-700)°C. The crystallization of films was observed on the plan-view specimens heated in-situ in Philips-400ST microscope. Cross-sectional objects were prepared to study the structure of interfaces.The crystallization temperature of Ni5 0 Ni5 0 and Ni8 0 Nb2 0 films was found to be equal to 675°C and 525°C correspondingly. The crystallization of Ni5 0 Ni5 0 films is followed by the formation of Ni6Nb7 and Ni3Nb nucleus. Ni8 0Nb2 0 films crystallise with the formation of Ni and Ni3Nb crystals. No interaction of both films with Si substrate was observed on plan-view specimens up to 700°C, that is due to the barrier action of the native SiO2 layer.

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