A study into first and second order thermal transitions of materials using Spectral-DSC

Low-temperature synthesis and characterization of lead-free BaTi0.89Sn0.11O3 piezoelectric powders

“…The presence of only one weak endothermic peak in a temperature range close to ambient temperature, between 30°C and 45°C implies the existence of a multiphase [18]. It is well known that a sudden change in spontaneous polarization during a first-order transition will produce latent heat and specific heat dissipation at the Curie temperature, meanwhile, the tricritical behavior refers to a special thermodynamic condition in which a first-order transition becomes a second-order transition, so due to the discontinuity of polarization, it involves a discontinuous change in specific heat, hence the transition can almost be undetectable and the intensity of the peak is much smaller from the first-order transition [26], [27]. Thus, the presence of one endothermic peak in a temperature range between 0°C and 90 °C, can leads that T R-O , T O-T and T c are all overlapped in the temperature range, between 30 °C and 45 °C.…”

Application of Vibrational Spectroscopy to Study Solid-state Transformations of Pharmaceuticals

“…Beard et al proposed a combined DSC and NIR method that uses a fiberoptic probe located over the sample within the DSC lid. This technique was used to monitor the dehydration kinetics of theophylline monohydrate by simultaneous DSC and NIR measurements [154,155]. A combination of DSC and vibrational spectroscopy was also utilized to monitor the temperature-induced dehydration, recrystallization and phase transformation of metoclopramide hydrochloride hydrate [156,157].…”

Quantitative Phase Analyses Through The Rietveld Method with X-Ray Powder Diffraction Data of Heat-Treated Carbamazepine Form III

“…5) that shows the melting point of form I (191.88 • C), no exothermic and/or endothermic events could be attributed to small amounts of form III. 24,28,29 First, the Rietveld refinement using the copper rotating anode data, obtained with a 5 • Soller slit (Fig. 6a), was performed supposing only the triclinic polymorph (form I).…”