Results 171 to 180 of about 93,771 (188)

On Avrami Exponent for Crystallization of NiP Glass

Scripta Metallurgica, 1987
J T Wang
exaly   +2 more sources

Determination of the avrami exponent by non-isothermal analyses

Journal of Non-Crystalline Solids, 1982
Abstract This paper presents a method for a rapid determination of the growth morphologies of glass-forming materials using thermoanalytical techniques (DTA or DSC, respectively). Since this method, which is based on the Johnson-Mehl-Avrami equation, does not require a temperature independent activation energy it is not restricted to low temperature ...
K. Harnisch, R. Lanzenberger
openaire   +1 more source

Calculations of Avrami exponent and applicability of Johnson–Mehl–Avrami model on crystallization in Er:LiY(PO3)4 phosphate glass

Journal of Thermal Analysis and Calorimetry, 2019
Preparation and thermal properties of Er3+-doped lithium–yttrium meta-phosphate glasses with a nominal composition of Er:LiY(PO3)4 were studied as a new scintillating material for neutron detection. The glassy Er:LiY(PO3)4 ingots 10 × 10 × 25 mm3 in size were prepared by quenching of the molten mixture of the starting lithium carbonate, yttrium ...
Petra Zemenová, Robert Král, Miroslava Rodová, Karel Nitsch, Martin Nikl   +4 more
openaire   +1 more source

Crystallization analysis and determination of Avrami exponents during isothermal annealing and the effect of cooling rate on the evolution of the atomic structure of Pd78Si16Cu6 alloy: A molecular dynamics simulation study

Journal of Non-Crystalline Solids, 2023
In this study, molecular dynamics simulations have been carried out to investigate the effect of cooling rate on the atomic structure of the Pd78Si16Cu6 alloy and the isothermal annealing process on the evolution of its glassy structure. It is observed that the atomic structure, glass transition temperature and crystallization temperature of the system
Guder, V., Celtek, M., Celik, F. A., Sengul, S.   +3 more
openaire   +1 more source

The activation energy and the Avrami exponent for crystallization in a-Bi0.5Se99.5−xZnx glasses

Current Applied Physics, 2003
Abstract The thermal stability of a-Bi 0.5 Se 99.5− x Zn x ( x =0, 0.1, 0.2, 0.5 and 1) glasses has been determined by an isothermal method. In this method, crystallization behavior has been studied by annealing the samples at higher temperature (between the glass transition and crystallization temperature).
Shamshad A Khan, M Zulfequar, M Husain
openaire   +1 more source

The Local Value of the Avrami Exponent: a New Approach to Devitrification of Glassy Metallic Ribbons

Materials Science and Engineering, 1988
Abstract We have examined the crystallization process in a number of PdSi, ZrFe and FeB amorphous ribbons of various compositions, thickness and surface conditions. As-quenched, pre-annealed, chemically etched and aged samples have been analysed using differential scanning calorimetry (DSC), X-ray diffraction and optical metallography. We conclude
A. Calka, A.P. Radlinski
openaire   +1 more source

Determination of avrami‐exponents of isotactic polypropylene by means of X‐ray methods

Die Angewandte Makromolekulare Chemie, 1993
AbstractAvrami‐exponents of polypropylene have been measured using two methods: observing the spherulitic growth in the polarization microscope, and measuring the crystallinity as a function of crystallization time using X‐ray wide angle scattering. Both methods yield the same values, showing that the determination of the Avrami‐exponent with optical ...
W. Wenig, B. Lemke
openaire   +1 more source

Dependence of the Avrami Exponent on Supercooling During Nonisothermal Crystallization of Poly(phenylene sulfide)

Polymer-Plastics Technology and Engineering, 2009
The nonisothermal crystallization behavior of poly(phenylene sulfide) (PPS) was studied by means of differential scanning calorimetry (DSC) at various cooling rates. The nonisothermal crystallization data were analyzed by the Ozawa theory. The Avrami exponent n was determined at several constant cooling rates.
Yi Xu, Li-Ming Huang, Ri-Chao Zhang, Ai Lu, Zhong-Ming Li, Jie Sun   +5 more
openaire   +1 more source

Determination of avrami exponent by differential scanning calorimetry for non-isothermal crystallization of polymers

Polymer, 1999
Abstract A novel approach was developed to study the non-isothermal crystallization kinetics of polymers based on the Ozawa equation. The method determines the Avrami exponent, n , using exclusively the data confined to the primary crystallization regime.
null Kim Piew Chuah, S.N. Gan, K.K. Chee
openaire   +1 more source

A Monte Carlo Simulation of Homogeneous Crystallization in Confined Spaces: Effect of Crystallization Kinetics on the Avrami Exponent

Macromolecular Theory and Simulations, 2010
AbstractHomogeneous nucleation in polymers and subsequent crystallization in spaces confined relative to spherulitic dimensions in one direction has been simulated for a wide range of nucleation and growth rates. An empirical equation based on simulation results relating an Avrami exponent of crystallization to growth and nucleation rates along with ...
Yury Yuryev, Paula Wood‐Adams
openaire   +1 more source