The Science & Technology
Cambridge - Monday 4th to
Wednesday 6th September 2017
Quyen Huyen Le
article posted 14 June 2017
2006: B.Sc., Chemical Engineering, CanTho University, Viet Nam
2009: Master of Engineering Advanced Manufacturing Technology, University of South Australia, Australia.
2015: Starting PhD at Otto Schott Institute of Materials Research, Friedrich Schiller University of Jena, Germany.
Effect of AlF3 and Na2SO4 on the structure and properties of sodium phosphate glasses
Q.H. Le* a,c, E.I. Kamitsos b, L. Wondraczek a
Changes in the structure of three glass series: [(100-x)NaPO3
(NAPF) in mol%, 0≤ x≤ 40];[ (80-y)NaPO3
0≤ y≤ 30] and [70NaPO3
(NAPFS2), 0≤ z≤ 20] were analysed by IR, Raman and NMR spectroscopy. IR and Raman show that
the addition of AlF3
causes major changes on the metaphosphate (Q2
) network . The formation of the Raman band at 765 cm-1
(Fig. 1a) can be associated with pyrophosphate dimers, P2
, originating from the depolymerization of metaphosphate chains . Charge
balancing of P2
by both Na+
ions causes the up-shift of the
) mode at ~ 1040-1090 cm-1
, and the creation of Al-O-P
bridging bonds . In addition, transition temperatures as well as elastic modulus also increase with raising amount of AlF3
As a part of NaPO3
in NAPF glasses were replaced by Na2
(NAPFS1 and NAPFS2), however, the chains ensemble is retained.
leads to a decrease in transition temperatures, but elastic modulus remain stable.
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 W. A. Dollase, L. H. Merwin and A. Sebald. Structure of Na3-3x
, x = 0 to 0.5. Journal of Solid State Chemistry 83, 140-149 (1989).
Otto-Schott-Institut, Friedrich- Schiller-Universität, Fraunhoferstraße 6, 07743 Jena, Germany
National Hellenic Research Foundation, Theoretical and Physical Chemistry Institute, Vass. Constantinou Ave. 48, 11635 Athens, Greece
Can Tho University of Technology, 256 Nguyen Van Cu, Can Tho, Vietnam