A quantitative analysis of the chlorination of samarium sesquioxide

M.R. ESQUIVEL; A. BOHE; D. PASQUEVICH

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Elsevier

Lugar: Amsterdam; Año: 2005 vol. 397 p. 310 - 313

0921-5093

In this work, the experimental data of the chlorination of Sm2O3 analyzed previously by thermogravimetry (TG) between 200 and 350 ◦C is fitted using the equations of Johnson–Mehl–Avrami (JMA). The presence of a change of the apparent activation energy (Eap) is correlated to a change on the parameters (n and k) of the JMA model. The values of n found were 1/2 and 2/3 in the 200–270 and 270–350 ◦C, respectively. These values were correlated to a change on the mechanism of the reaction. The k values obtained from the JMA equations were used to confirm the experimental Eap values previously found in the mentioned higher and lower temperature range: 45±5 and 130±5 kJmol−1, respectively. The nucleation and growth processes observed were also in agreement with results obtained by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).2O3 analyzed previously by thermogravimetry (TG) between 200 and 350 ◦C is fitted using the equations of Johnson–Mehl–Avrami (JMA). The presence of a change of the apparent activation energy (Eap) is correlated to a change on the parameters (n and k) of the JMA model. The values of n found were 1/2 and 2/3 in the 200–270 and 270–350 ◦C, respectively. These values were correlated to a change on the mechanism of the reaction. The k values obtained from the JMA equations were used to confirm the experimental Eap values previously found in the mentioned higher and lower temperature range: 45±5 and 130±5 kJmol−1, respectively. The nucleation and growth processes observed were also in agreement with results obtained by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).Eap) is correlated to a change on the parameters (n and k) of the JMA model. The values of n found were 1/2 and 2/3 in the 200–270 and 270–350 ◦C, respectively. These values were correlated to a change on the mechanism of the reaction. The k values obtained from the JMA equations were used to confirm the experimental Eap values previously found in the mentioned higher and lower temperature range: 45±5 and 130±5 kJmol−1, respectively. The nucleation and growth processes observed were also in agreement with results obtained by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).n and k) of the JMA model. The values of n found were 1/2 and 2/3 in the 200–270 and 270–350 ◦C, respectively. These values were correlated to a change on the mechanism of the reaction. The k values obtained from the JMA equations were used to confirm the experimental Eap values previously found in the mentioned higher and lower temperature range: 45±5 and 130±5 kJmol−1, respectively. The nucleation and growth processes observed were also in agreement with results obtained by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).k values obtained from the JMA equations were used to confirm the experimental Eap values previously found in the mentioned higher and lower temperature range: 45±5 and 130±5 kJmol−1, respectively. The nucleation and growth processes observed were also in agreement with results obtained by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).Eap values previously found in the mentioned higher and lower temperature range: 45±5 and 130±5 kJmol−1, respectively. The nucleation and growth processes observed were also in agreement with results obtained by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD).