Low scan rate DSC study of the monoclinic-tetragonal transition in zirconia
2011; Elsevier BV; Volume: 524; Issue: 1-2 Linguagem: Inglês
10.1016/j.tca.2011.06.004
ISSN1872-762X
AutoresDaniela Lega, Alessandra Antonini, Andrea Ciccioli, Sergio Brutti, Paolo Lenzuni,
Tópico(s)High-pressure geophysics and materials
ResumoThe effect of heating and cooling rates on the DSC (differential scanning calorimetry) heat flux peak of the monoclinic-tetragonal transition of zirconia was investigated in the 0.4–20 °C/min scan rate range. While the peak position, shape and area at high to moderate scan rates are consistent with existing literature data, a 'step change' (i.e., a peak-less baseline shift) was observed for the extremely slow heating rate of 0.4 °C/min. As expected, peak profiles in the heating and cooling transitions are markedly different, the peak shape being strongly asymmetrical for the t → m transition, but very closely symmetrical for the m → t transition. As the cooling rate is lowered, the t → m peak is increasingly splitted into multiple components, whose individual properties have been fitted using Gamma distribution functions.
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