Publication detail

Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs

RAVASZOVÁ, S. DVOŘÁK, K. BOHÁČ, M. VŠIANSKÝ, D. JANČÍKOVÁ, A.

Original Title

Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs

Type

journal article in Web of Science

Language

English

Original Abstract

Tricalcium aluminate is an important phase of Portland clinker. In this paper, three polymorphs of C3A were prepared by means of the solid-state synthesis method using intensive milling of the raw material mixture which was doped with various amounts of Na2O and sintered at a temperature of 1300 °C for 2 h. The final products were evaluated through X-ray diffraction using Rietveld analysis. The effect of the Na dopant content on the change in the crystalline structure of tricalcium aluminate was studied. It was proven that the given preparation procedure, which differed from other studies, was close to the real conditions of the formation of Portland clinker, and it was possible to prepare a mixture of different polymorphs of calcium aluminate. Fundamental changes in the crystal structure occurred in the range of 3–4% Na, when the cubic structure changes to orthorhombic. At a dosage of Na dopant above 4%, the orthorhombic structure changes to a monoclinic structure. There are no clearly defined boundaries for the existence of individual C3A phases; these phases arise at the same time and overlap each other in the areas of their formation at different Na doses.

Keywords

tricalcium aluminate; polymorphism; cubic; orthorhombic; monoclinic; crystallite size

Authors

RAVASZOVÁ, S.; DVOŘÁK, K.; BOHÁČ, M.; VŠIANSKÝ, D.; JANČÍKOVÁ, A.

Released

3. 2. 2024

Publisher

MDPI

Location

Switzerland

ISBN

1996-1944

Periodical

Materials

Year of study

17

Number

3

State

Swiss Confederation

Pages from

1

Pages to

17

Pages count

17

URL

https://www.mdpi.com/1996-1944/17/3/735

BibTex

@article{BUT187617,
  author="Simona {Ravaszová} and Karel {Dvořák} and Martin {Boháč} and Dalibor {Všianský} and Andrea {Jančíková}",
  title="Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs",
  journal="Materials",
  year="2024",
  volume="17",
  number="3",
  pages="17",
  doi="10.3390/ma17030735",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/17/3/735"
}