Model for the Particle Size, Overpotential, and Strain Dependence of Phase Transition Pathways in Storage Electrodes: Application to Nanoscale Olivines

2009 ◽  
Vol 21 (8) ◽  
pp. 1557-1571 ◽  
Author(s):  
M. Tang ◽  
H.-Y. Huang ◽  
N. Meethong ◽  
Y.-H. Kao ◽  
W. C. Carter ◽  
...  
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Strain Dependence ◽  
Transition Pathways

Effect of Annealing Temperature on Phase Transition of Nanoalumina Synthesized by Auto-Combustion Route

2016 ◽  
Vol 41 ◽  
pp. 74-86 ◽  
Author(s):  
Muhammad Adil ◽  
Hasnah Mohd Zaid ◽  
Kean Chuan Lee ◽  
Noor Rasyada Ahmad Latiff
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Amorphous State ◽  
Specific Area ◽  
Combustion Method ◽  
Gravimetric Analysis ◽  
Crystalline Phases ◽  
Auto Combustion

Nanocrystalline Al2O3 powder has been successfully synthesized by a simple and fast sol-gel auto-combustion method. The transformation of crystalline phases of as-synthesized nano powders was investigated through X-ray diffraction in terms of their crystallinity and crystallite size. Subsequently, a detailed transmission electron microscopy (TEM) investigation, including specific area electron diffraction (SAED) analysis revealed the crystallographic alterations and morphological information even at lattice scale which co-include the XRD analysis. The results obtained allow to explain the evolution of an amorphous state into different crystalline phases with increased calcining temperature; and their relation to particle size. The particle size is found to be closely related to phase transition of Al2O3 from γ → δ → θ → κ →α. The existence of distinctive bonds and band energy were studied by employing Fourier-transform infrared spectroscopy (FTIR) and UV-visible spectroscopy, respectively. On the other hand, thermo gravimetric analysis (TGA) had also been performed to confirm the phase purity of nano powder.

scholarly journals Influence of nitrogen and air atmosphere during thermal treatment on micro and nano sized powders and sintered TiO2 specimens

2014 ◽  
Vol 46 (3) ◽  
pp. 365-375
Author(s):  
N. Labus ◽  
S. Mentus ◽  
Z.Z. Djuric ◽  
M.V. Nikolic
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Powder Particle ◽  
Rutile Phase ◽  
Nitrogen Atmosphere ◽  
Powder Particle Size ◽  
Nano Tio2 ◽  
Thermo Gravimetric ◽  
Air Atmosphere ◽  
Thermal Techniques

The influence of air and nitrogen atmosphere during heating on TiO2 nano and micro sized powders as well as sintered polycrystalline specimens was analyzed. Sintering of TiO2 nano and micro powders in air atmosphere was monitored in a dilatometer. Non compacted nano and micro powders were analyzed separately in air and nitrogen atmospheres during heating using thermo gravimetric (TG) and differential thermal analysis (DTA). The anatase to rutile phase transition temperature interval is influenced by the powder particle size and atmosphere change. At lower temperatures for nano TiO2 powder a second order phase transition was detected by both thermal techniques. Polycrystalline specimens obtained by sintering from nano powders were reheated in the dilatometer in nitrogen and air atmosphere, and their shrinkage is found to be different. Powder particle size influence, as well as the air and nitrogen atmosphere influence was discussed.

scholarly journals PREPARATION AND PARTICLE-SIZE CONTROL OF AMMONIUM POLYPHOSPHATE FORM II BY THE PHASE TRANSITION OF AMMONIUM POLYPHOSPHATE FORM I-I

1999 ◽  
Vol 9 (0) ◽  
pp. 91-96 ◽  
Author(s):  
MAKOTO WATANABE ◽  
YOSHINORI YAMAGUCHI ◽  
MAKOTO SAKURAI ◽  
HIROKAZU SUZUKI ◽  
MIOKO MAEDA
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Size Control ◽  
Ammonium Polyphosphate ◽  
Particle Size Control

Construction of Rod-Forming Single Network Mesophases in Rod–Coil Diblock Copolymers via Inversely Designed Phase Transition Pathways

2018 ◽  
Vol 51 (15) ◽  
pp. 5773-5787 ◽  
Author(s):  
Tongjie Sun ◽  
Faqiang Liu ◽  
Ping Tang ◽  
Feng Qiu ◽  
Yuliang Yang
Keyword(s):  
Phase Transition ◽  
Diblock Copolymers ◽  
Transition Pathways

scholarly journals In Situ Time-Resolved Decomposition of β-Hydride Phase in Palladium Nanoparticles Coated with Metal-Organic Framework

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 810
Author(s):  
Mikhail V. Kirichkov ◽  
Aram L. Bugaev ◽  
Alina A. Skorynina ◽  
Vera V. Butova ◽  
Andriy P. Budnyk ◽  
...  
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Hydrogen Adsorption ◽  
Metal Organic Framework ◽  
Pd Nanoparticles ◽  
Time Resolved ◽  
Metal Organic ◽  
Hydride Phases ◽  
Organic Framework

The formation of palladium hydrides is a well-known phenomenon, observed for both bulk and nanosized samples. The kinetics of hydrogen adsorption/desorption strongly depends on the particle size and shape, as well as the type of support and/or coating of the particles. In addition, the structural properties of hydride phases and their distribution also depend on the particle size. In this work, we report on the in situ characterization of palladium nanocubes coated with HKUST-1 metal-organic framework (Pd@HKUST-1) during desorption of hydrogen by means of synchrotron-based time-resolved X-ray powder diffraction. A slower hydrogen desorption, compared to smaller sized Pd nanoparticles was observed. Rietveld refinement of the time-resolved data revealed the remarkable stability of the lattice parameters of α- and β-hydride phases of palladium during the α- to β- phase transition, denoting the behavior more similar to the bulk materials than nanoparticles. The stability in the crystal sizes for both α- and β-hydride phases during the phase transition indicates that no sub-domains are formed within a single particle during the phase transition.

Particle Size Effects on the Order–Disorder Phase Transition in [(CH3)2NH2]Mg(HCOO)3

2020 ◽  
Vol 124 (38) ◽  
pp. 21113-21122 ◽  
Author(s):  
Steven A. LoCicero ◽  
Carolyn M. Averback ◽  
Ulyana Shumnyk ◽  
Eun Sang Choi ◽  
Daniel R. Talham
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Size Effects ◽  
Particle Size Effects ◽  
Disorder Phase Transition
Sign in / Sign up

Export Citation Format

Share Document