By Ilias Belharouak, Vilas G. Pol
This e-book presents a great one-stop source for knowing an important present concerns within the examine and advances in inorganic phosphate materials.Content:
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Additional resources for Advances in Inorganic Phosphate Materials: Ceramic Transactions, Volume 233
1 . -. i 2 Theta, deg Figure 1. Experimental, calculated and difference patterns for VNH4HP3O10 in the range 2Θ = 10-50°. The positions of the Bragg reflections are marked by ticks. Figure 2. The triphosphate anion in the crystal structure of VNH4HP3O10. The H atom of each POH group belongs to two neighbouring anions providing one hydroxyl H atom per formula unit. Symmetry transformation (i): -x+\,y, -z+lA. Figure 2 shows the anion HP3Oio4~ in the crystal structure of VNH4HP3Oio. The asymmetric unit comprises one V, two P, five O, one N and three H atoms (two of the ammonium cation and one of the hydroxyl group).
Electrical polarization procedure of HAp The sample is sandwiched by a pair of electrodes and heated in a furnace. A voltage is applied to the electrodes for a predefined time at an elevated temperature. The applied voltage is maintained until the sample is cooled to room temperature. MEASUREMENT OF THERAMALLY STIMULATED DEPOLARIZATION CURRENT A thermally stimulated depolarization current is effective method for confirming polarization and evaluation of the stored charges in HAp. Figure 2 shows schematic illustration of TSDC measurement technique.
1*4 The HAp electrets are prepared by electrical polarization procedure, which usually applied for ferroelectric or piezoelectric material. In ferroelectrics, electrical dipoles due to displacement of the lattice of the crystal are predominantly arranged in a dc electric field. 5" The technique of surface engineering is superior to conventional method because other doping elements or chemicals are not necessary. In this report, we will show the method of fabrication of the HAp electrets and the evaluation results by thermally stimulated depolarization current (TSDC).
Advances in Inorganic Phosphate Materials: Ceramic Transactions, Volume 233 by Ilias Belharouak, Vilas G. Pol