RT Journal Article
T1 Mechanism of stabilization of dicalcium silicate solid solution with aluminium
A1 Cuesta-García, Ana María
A1 García-Aranda, Miguel Ángel
A1 Sanz, Jesús
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Losilla, Enrique R.
K1 Químina inorgánica
AB Stoichiometric dicalcium silicate, Ca2SiO4, displays a well-known polymorphism with temperature. Whenthis phase is doped by a range of elements, belite, one of the main phases of cements, is generated. Here,we thoroughly study the aluminum doping of dicalcium silicate. This type of study is important forcement characterization and also from a basic point of view. Ca2Si1−2xAl2xO4−x□x (x = 0, 0.010, 0.014,0.03) has been prepared and studied by X-ray powder diffraction and the Rietveld method. The limitingcomposition has been established as Ca2Si0.972Al0.028O3.986□0.014. The 27Al MAS NMR band located closeto ∼−70 ppm is ascribed to tetrahedral environments, in agreement with the proposed aliovalent Si/Alatomic substitution mechanism. Thermal analysis measurements under a wet atmosphere indirectlyconfirm the increase of oxygen vacancies as the amount of incorporated protons increases with thealuminium content. A thorough electrical characterization has been carried out including overall conductivitymeasurements under wet and dry atmospheres and conductivity as a function of the oxygenpartial pressure. The samples show oxide anion conductivity with a small p-type electronic contributionunder oxidizing conditions. These compounds display a very important proton contribution to the overallconductivities under humidified atmospheres.
PB ELSEVIER
SN 1477-9226
YR 2013
FD 2013-11-11
LK http://hdl.handle.net/10630/9784
UL http://hdl.handle.net/10630/9784
LA eng
NO This work has been supported by the Spanish Ministry ofScience and Innovation through the research grant MAT2010-15175 which is co-founded by FEDER and Junta de Andalucía(Spain) through the research grant P10-FQM-6680.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 22 ene 2026