Physico-chemical studies of MgNa₃P₃O₁₀·12H₂O

Abstract

Abstract.A magnesium-sodium triphosphate MgNa 3 P 3 O 10 · 12H 2 O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA), differential scanning calorimetry (DSC) and infrared spectrometry which show the characteristic bands of a triphosphate P 3 O 5− 10 . The results of differential thermal analysis, X-Ray powder diffraction and IR spectra of the compound heated at different temperatures showed that, after dehydration, MgNa 3 P 3 O 10 · 12H 2 O decomposes into an amorphous compound, then it crystallizes at 600 • C in order to give the anhydrous triphosphate MgNa 3 P 3 O 10 . MgNa 3 P 3 O 10 is stable until its melting point at 612 • C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P 3 O 10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of MgNa 3 P 3 O 10 · 12H 2 O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed crystalline structure.

Improvement in Dispersion of Phosphate Pigments Modified by Functionalized Graphite Nanoplatelets and Its Influence on Epoxy Coating Adhesion

“…The related bands to the symmetric and antisymmetric stretching frequencies of PO 2 and PO 3 in TPP are generally observed in the region 1190-1010 cm À1 , and the observed bands in the domain 970-840 cm À1 are attributed to the antisymmetric and symmetric P-O-P stretching modes [24] .…”

“…4c), showed PO 2 and PO 3 in 1159-1129 cm À1 range and P-O-P bridge in 894 cm À1 , respectively, which were absent in unmodified FGNP. These are the characteristic peaks for polyphosphates, indicating the presence of TPP in FGNP-TPP [24] .…”

Influence of hybrid functionalized graphite nanoplatelets-tripolyphosphate on improvement in fire protection of intumescent fire resistive coating for steel structures

“…Bands in the 1300e1200 cm À1 range correspond to P]O stretching mode. The related bands to the symmetric and antisymmetric-stretching frequencies of PO 2 and PO 3 in TPP are generally observed in the region 1190e1010 cm À1 and the observed bands in the domain 970e840 cm À1 are attributed to the antisymmetric and symmetric PeOeP stretching modes [33].…”

“…2(c)), showed PO 2 and PO 3 in 1159e1129 cm À1 range and PeOeP bridge in 894 cm À1 , respectively which were absent in non-modified FGNP. These are characteristic peaks for polyphosphates, indicating the presence of TPP in FGNP-TPP [33].…”

Long-term corrosion resistance of zinc-rich paint using functionalised multi-layer graphene-tripolyphosphate: in situ creation of zinc phosphate as corrosion inhibitor

“…Beside P-O bonds, polyphosphate compounds contain bridged P-O-P bonds that limit bond movement. The frequencies of the tripolyphosphate anion are assigned on the basis of the characteristic vibrations of the P-O-P bridge, PO 2 , PO 3 groups and P=O stretching [38]. The bands in the range of 1300-1200 cm −1 correspond to P=O stretching mode.…”