Determination of crystallization kinetics parameters of a Li1.5Al0.5Ge1.5(PO4)3 (LAGP) glass by differential scanning calorimetry
| Autor: | J. L. Narváez-Semanate, Aluisio A. Cabral, Ana Candida Martins Rodrigues, Alisson Mendes Rodrigues |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
crystallization Kissinger's method nucleation Analytical chemistry Ionic bonding chemistry.chemical_element Activation energy DSC law.invention Ion Differential scanning calorimetry law lcsh:TA401-492 Fast ion conductor Ionic conductivity General Materials Science Crystallization Materials of engineering and construction. Mechanics of materials Ligero's method Mechanical Engineering Avrami coefficient Condensed Matter Physics activation energy chemistry Mechanics of Materials TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials Lithium |
| Zdroj: | Materials Research, Iss ahead, p 0 (2013) Materials Research, Volume: 16, Issue: 4, Pages: 811-816, Published: 16 APR 2013 Materials Research v.16 n.4 2013 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Vol 16, Iss 4, Pp 811-816 (2013) |
| ISSN: | 1980-5373 1516-1439 |
| DOI: | 10.1590/s1516-14392013005000055 |
| Popis: | Crystallization kinetics parameters of a stoichiometric glass with the composition Li1.5Al0.5Ge1.5(PO4)3 were investigated by subjecting parallelepipedonal samples (3 × 3 × 1.5 mm) to heat treatment in a differential scanning calorimeter at different heating rates (3, 5, 8 and 10 °C/min). The data were analyzed using Ligero's and Kissinger's methods to determine the activation energy (E) of crystallization, which yielded, respectively, E = 415 ± 37 kJ/mol and 378 ± 19 kJ/mol. Ligero's method was also employed to calculate the Avrami coefficient (n), which was found to be n = 3.0. A second set of samples were heat-treated in a tubular furnace at temperatures above the glass transition temperature, Tg, to induce crystallization. The X-ray diffraction analysis of these samples indicated the presence of LiGe2(PO4)3 which displays a NASICON-type structure. An analysis by optical microscopy revealed the presence of spheric crystals located primarily in the volume, in agreement with the crystallization mechanism predicted by the Avrami coefficient. |
| Databáze: | OpenAIRE |
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