โ Scribed by Wei Shi; M Wang; X Sun; Q.T Gu; H.S Zhuo; C.S Fang
No coin nor oath required. For personal study only.
Based on the Devonshire thermodynamic theory, the relationship X/Z = Ps/C can be regarded as a method to increase the pyroelectric material figure of merit of ferroelectric crystals. Several modified TGS crystals doped with urea or co-doped with urea and other dopants have been grown. The effect of the urea dopant on crystal growth and pyroelectric properties was investigated. The pyroelectric figures of merit M ( ;k/e) of the doped TGS crystals are obviously higher than those of pure TGS. Furthermore, the variations ofX/Z and Ps/C as a function of temperature for these doped TGS single crystals were measured, and analyzed according to the Devonshire thermodynamic model.
๐ SIMILAR VOLUMES
The glass-transition temperatures (T,'s) and specific heats (C,,) of poly(viny1 chloride) (PVC) and PVC plasticized with 5-120 phr di(2-ethylhexyl) adipate (DOA) and tri(2-ethylhexyl) trimellitate (TOTM) have been determined by differential scanning calorimetry (DSC). Measured Tg's were compared to