A study of inter-crystallite spaces in some polycrystalline inorganic systems using positron annihilation lifetime spectroscopyстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Shantarovich V.P.,
Suzuki T.,
Ito Y. ,
Kondo K. ,
Gustov V.W. ,
Melikhov I.V. ,
Berdonosov S.S. ,
Ivanov L.N.,
Yu R.S.
Журнал:
Radiation Physics and Chemistry
Том:
76
Номер:
2
Год издания:
2007
Издательство:
Elsevier
Местоположение издательства:
United States
Первая страница:
257
Последняя страница:
262
DOI:
10.1016/j.radphyschem.2006.03.047
Аннотация:
Positron annihilation lifetime spectroscopy (PALS) was used for calculation of number density and effective sizes of free volume holes (inter-crystallite spaces) in polycrystal CaSO 4, CaCO 3 (vaterit) and Ca 10(PO 4) 6(OH) 2 (apatite). The effect of substitution of two-valence Ca(II) for three-valence Eu(III) on annihilation characteristics of apatite, studied together with the data on thermo-stimulated luminescence (TSL) and low-temperature sorption of gas (N 2), helped to elucidate mechanism of positronium atom (Ps) localization in the free volume holes and perform corresponding calculations. It came out that PALS is more sensitive to inter-crystallite sites (10 16 cm -3) in polycrystallites than to the free volume holes in polymer glasses (10 19 cm -3). This is due to higher mobility of the precursor of localized Ps in crystallites. © 2006 Elsevier Ltd. All rights reserved.
Добавил в систему:
Мелихов Игорь Витальевич