Determination of the Binodal and Spinodal Phase Separation Temperatures in the Blend System PαMS0.5-co-AN0.5(Luran)/PMMA0.95MA0.05(Lucryl) with Positron Annihilation Lifetime Spectroscopy

2002 ◽  
Vol 35 (24) ◽  
pp. 9074-9078 ◽  
Author(s):  
K. Günther-Schade ◽  
D. W. Schubert ◽  
F. Faupel
Keyword(s):  
Phase Separation ◽  
Positron Annihilation ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Positron Annihilation Lifetime

Study of Fe75Al25 Alloys by the Mössbauer Spectroscopy Positron Annihilation Lifetime Spectroscopy (PALS), XRD and SEM

2013 ◽  
Vol 203-204 ◽  
pp. 137-141 ◽  
Author(s):  
Aneta Hanc-Kuczkowska ◽  
Jerzy Kansy ◽  
Grzegorz Dercz ◽  
Lucjan Pająk ◽  
Józef Lelątko ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Positron Annihilation ◽  
Mossbauer Spectroscopy ◽  
Vacancy Concentration ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
X Ray Diffraction ◽  
Slow Cooling ◽  
Positron Annihilation Lifetime ◽  
Mößbauer Spectroscopy

The structure, point defect and ordering parameter of Fe25Al samples is examined with the Mössbauer spectroscopy Positron Annihilation Lifetime Spectroscopy XRD and SEM. The studies are carried out for samples in as-cast state and after heat treatments: annealing for 24 hours at 900°C (or 1050°C) and either slow cooling with furnace or quenching to oil. Among the research method used, Mössbauer spectroscopy for determination of hyperfine structure parameters was adopted. These parameters, sensitive to changes in spin and charge electron densities in the nearest neighbourhood of a Mössbauer isotope nucleus, caused by specific configurations of atoms, are directly connected with the degree of ordering of a compound. Spectral analysis has been carried out using an authors’ software developed based on a theoretical model relating the shape of a Mössbauer spectrum to the sample microstructure. It has been shown that Mössbauer spectroscopy enables quantitative evaluation of the degree of ordering of phases occurring in samples characterised by large graining, in the case of which it is not possible to determine the long-range order parameter by X-ray diffraction. The PALS method only one type of defects is detected. The positron lifetime in these defects (V) suggests that they are quenched-in Fe-monovacancies (VFe). The vacancy concentration strongly depends on the rate of cooling.

Pore Size Determination of TEMPO-Oxidized Cellulose Nanofibril Films by Positron Annihilation Lifetime Spectroscopy

2011 ◽  
Vol 12 (11) ◽  
pp. 4057-4062 ◽  
Author(s):  
Hayaka Fukuzumi ◽  
Tsuguyuki Saito ◽  
Shinichiro Iwamoto ◽  
Yoshiaki Kumamoto ◽  
Toshiyuki Ohdaira ◽  
...  
Keyword(s):  
Pore Size ◽  
Positron Annihilation ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Oxidized Cellulose ◽  
Size Determination ◽  
Cellulose Nanofibril ◽  
Positron Annihilation Lifetime

Determination of Free-Volume Properties in Polymers Without Orthopositronium Components in Positron Annihilation Lifetime Spectroscopy

2011 ◽  
Vol 44 (17) ◽  
pp. 6818-6826 ◽  
Author(s):  
Kuo-Sung Liao ◽  
Hongmin Chen ◽  
Somia Awad ◽  
Jen-Pwu Yuan ◽  
Wei-Song Hung ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Positron Annihilation Lifetime ◽  
Volume Properties
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