Electrical properties and thermal stability of FePO4 glasses and nanomaterials

T.K. Pietrzak , L. Wewior , J.E. Garbarczyk , Marek Wasiucionek , I. Gorzkowska , J.L. Nowinski , S. Gierlotka


Glasses under study were prepared by a standard press quenching technique. Differential thermal analysis (DTA) measurements have shown that the as-obtained glasses are stable up to 530 °C. The DTA traces contain three thermal events: a baseline shift due to the glass transition followed by two distinct exothermic peaks related to crystallization processes. The positions of maxima of those peaks obey a Kissinger formula with the activation energy values: 3.7 ± 0.1 eV, 4.3 ± 0.2 eV, respectively. Heating of the samples to about 620 °C leads to their nanocrystallization. The average grain size in nanocrystalline samples as estimated from scanning electron microscopy (SEM) and X-ray diffraction (XRD) is between 60 and 70 nm. The nanocrystallized samples have two important advantages: they are stable to at least 660 °C and their electronic conductivity at room temperature is substantially higher than that of the as-prepared glasses (1.2·10− 7 S/cm vs. 1.5·10− 8 S/cm).
Author T.K. Pietrzak
T.K. Pietrzak,,
, L. Wewior
L. Wewior,,
, J.E. Garbarczyk
J.E. Garbarczyk,,
, Marek Wasiucionek ZJCS
Marek Wasiucionek,,
- Solid State Ionics Division
, I. Gorzkowska
I. Gorzkowska,,
, J.L. Nowinski
J.L. Nowinski,,
, S. Gierlotka
S. Gierlotka,,
Journal seriesSolid State Ionics, ISSN 0167-2738
Issue year2011
Keywords in EnglishCathode materials, FePO4 glasses, Nanocrystallization, Nanomaterials
URL http://www.sciencedirect.com/science/article/pii/S0167273810006284
Score (nominal)35
Publication indicators WoS Impact Factor: 2011 = 2.646 (2) - 2011=3.097 (5)
Citation count*8 (2015-05-15)
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