A solid state NMR and in-situ infrared spectroscopy study on the setting reaction of magnesium sodium phosphate cement

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F18%3A00490198" target="_blank" >RIV/68378297:_____/18:00490198 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.jnoncrysol.2018.06.006" target="_blank" >https://doi.org/10.1016/j.jnoncrysol.2018.06.006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2018.06.006" target="_blank" >10.1016/j.jnoncrysol.2018.06.006</a>

Result language

angličtina

Original language name

A solid state NMR and in-situ infrared spectroscopy study on the setting reaction of magnesium sodium phosphate cement

Original language description

In the present work, the setting reaction of magnesium sodium phosphate cement was followed in time with insitu attenuated total reflectance Fourier-transform infrared spectroscopy and solid state nuclear magnetic resonance spectroscopy, in order to gain insights into the products and phase transformations. The results indicated that, during the progress of the reaction, amorphous phases containing the H2PO4 − structural group converted into phases containing HPO42− and finally PO4 3−. The increase in pH triggered by the MgO dissolution was considered as the driving force for the transformations. This is supposed to promote the establishment of a high degree of supersaturation close to the surface of MgO grains, resulting in kinetically driven transformations and favouring the amorphous nature of the products. It is suggested that in the later stages of the reaction, two orthophosphate amorphous phases, hosting bound water molecules, coexisted, with the one showing a relatively more ordered 31P local environment, converting into a second with a more disordered phosphorous environment. The densification of the ceramic can be considered as a structural reorganization encompassing bonding of water molecules into a pervasive amorphous phase, containing magnesium-phosphate structural units and involving limited structural rearrangements of the local environment of P and, especially, of Na.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20504 - Ceramics

Project

<a href="/en/project/LO1219" target="_blank" >LO1219: Sustainable advanced development of CET</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

—

Volume of the periodical

498

Issue of the periodical within the volume

October

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

11

Pages from-to

49-59

UT code for WoS article

000440389500007

EID of the result in the Scopus database

2-s2.0-85048578377