Structural study of xK2O·(100 − x)[P2O5·CaO] glass system
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The P2O5–CaO glasses with incorporation of K2O were investigated using X-ray powder diffraction, infrared absorption, and Raman scattering. These measurements give information about potassium–calcium phosphate glasses related vibration modes and the nature of the bond between P, K, and Ca ions and surrounding oxygen atoms within the glass network. Thermal analysis DTA and GTA were also made to study behavior under different temperature regimes and to see chemical changes with time and temperature of these glasses. The evolution of the absorption bands, with the increasing of K2O, shows the significant distortions of the phosphate groups. Beginning with x = 35 mol% in Raman spectra appear new bands and the existing one disappear. But from Raman spectra we can see that the increasing of potassium oxide content leads to the appearance of gradually depolymerization process of the calcium phosphate network.
KeywordsDifferential Thermal Analysis Glass Matrix Differential Thermal Analysis Curve Phosphate Glass Glass Network
The author Adriana Regos is grateful for the financial support from the project co-financed by the Sectoral Operational Program for Human Resources Development 2007–2013, Key Area of Intervention 1.5: Doctoral and post-doctoral programs in support of research; Contract POSDRU/88/1.5/S/60185 “Innovative doctoral studies in a knowledge based society,” Babeş-Bolyai University, Cluj Napoca, Romania. A. Regos wishes to thank for the financial support from programs co-financed by The Sectoral Operational Program Human Resources Development, Contract POSDRU 6/1.5/S/3—Doctoral studies: through science toward society.
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