Junaid, Bushiri M; Wilson, E V; Vaidyan, V K(Elsevier, June 11, 2010)
[+]
[-]
Abstract:
Urinary stones resected from urinary bladders of patients hailing from Kollam district of Kerala State, India
were analyzed by SEM, XRD and by thermal analysis techniques. The analytical results indicate that,
stones have different composition, i.e., calcium phosphate, calcium phosphate hydroxide and sodium
calcium carbonate. Infrared spectral studies also reveal the presence of phosphates or carbonates in
these samples. Further, IR spectral investigations have revealed that amorphous carbonated species are
occupied in PO4 sites in calcium phosphate type stone and OH sites in calcium phosphate hydroxide
sample. Thermal studies of these samples also reveal that, carbon dioxide is released from carbonated
samples upon heating which is related to amount of carbon content and bond strength. Crystals with
defects and irregular morphology are grown inside the urinary bladder due to variation in crystal growth
conditions
Jacob, Philip; Manjusha, M V(Taylor & Francis, 2008)
[+]
[-]
Abstract:
The thermal transport properties, thermal diffusivity, thermal conductivity and specific heat
capacity of Dicalcium Lead Propionate (DLP) crystal have been measured following a modified
photopyroelectric thermal wave method. The measurements have been carried out with
thermal waves propagating along the three principal symmetry directions, so as to bring out the
anisotropy in these parameters. The variations of the above parameters through two prominent
phase transition temperatures of this crystal have also been measured to understand the variation
of these parameters as it undergoes ferroelectric phase transitions. In addition, complete
thermal analysis and FTIR measurements have been done on the crystal to bring out the correlation
of these results with the corresponding thermal transport properties. All these results are
presented and discussed. The data presented in this paper form a comprehensive set of results
on the thermal transport properties of this crystal.