By Ilias Belharouak, Vilas G. Pol

This ebook offers a very good one-stop source for knowing crucial present concerns within the learn and advances in inorganic phosphate fabrics.

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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). The V atom and the hydroxyl H atom lie on inversion centres, whereas the N and central P atoms are on two-fold axes.

The current flows accompanying with the increase of temperature, from the electrode of Nsurface side and the electrode of P-surface side. Figure 3 shows representative results of measurements of TSDC. Broad peaks are observed, confirming that the HAp is polarized same as ferroelectrics. The broad beaks at about 300-400 °C derive from the polarization due to the proton migration. The peak heights of the polarization increase with increasing of the applied voltage. Generally, TSDC measurements of ferroelectrics have sharp peaks at their phase transition temperature, while the TSDC curves of HAp have broad peaks.

32, 563-571 (1999). 9 L. Farrugia, WinGX suite for small-molecule single-crystal crystallography, J. Appl. , 32,837-838(1999). 10 A. Durif, Crystal Chemistry of Condensed Phosphates, Plenum Press, New York, 1995. ll M. A. G. Aranda, J. Chaboy, S. Bruque, Characterization of Manganese(III) Dihydrogen Triphosphate Dihydrate, Η2ΜηΡ3θιο·2Η20, Inorg. , 30,2394-2397 (1991). 50 · Advances in Inorganic Phosphate Materials Advances in Inorganic Phosphate Materials: Ceramic Transactions, Volume 233 Edited by Ilias Belharouak and Vilas G.

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