Formation, Stability, and Crystallinity of Various Tricalcium
Aluminate Polymorphs

J 2024

Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs

RAVASZOVA, Simona, Karel DVOŘÁK, Martin BOHÁČ, Dalibor VŠIANSKÝ, Andrea JANČÍKOVÁ et. al.

Basic information

Original name

Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs

Authors

RAVASZOVA, Simona, Karel DVOŘÁK (guarantor), Martin BOHÁČ, Dalibor VŠIANSKÝ (203 Czech Republic, belonging to the institution) and Andrea JANČÍKOVÁ

Edition

Materials, MDPI, 2024, 1996-1944

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10504 Mineralogy

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 3.400 in 2022

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.3390/ma17030735

UT WoS

001160261600001

Keywords in English

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

Abstract

V originále

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 degrees 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.

Citovat

RAVASZOVA, Simona, Karel DVOŘÁK, Martin BOHÁČ, Dalibor VŠIANSKÝ and Andrea JANČÍKOVÁ. Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs. Materials. MDPI, 2024, vol. 17, No 3, p. 1-15. ISSN 1996-1944. Available from: https://dx.doi.org/10.3390/ma17030735.

@article{2393112,
   author = {Ravaszova, Simona and Dvořák, Karel and Boháč, Martin and Všianský, Dalibor and Jančíková, Andrea},
   article_number = {3},
   doi = {http://dx.doi.org/10.3390/ma17030735},
   keywords = {tricalcium aluminate; polymorphism; cubic; orthorhombic; monoclinic; crystallite size},
   language = {eng},
   issn = {1996-1944},
   journal = {Materials},
   title = {Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs},
   url = {https://www.mdpi.com/1996-1944/17/3/735},
   volume = {17},
   year = {2024}
}

TY  - JOUR
ID  - 2393112
AU  - Ravaszova, Simona - Dvořák, Karel - Boháč, Martin - Všianský, Dalibor - Jančíková, Andrea
PY  - 2024
TI  - Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs
JF  - Materials
VL  - 17
IS  - 3
SP  - 1-15
EP  - 1-15
PB  - MDPI
SN  - 19961944
KW  - tricalcium aluminate
KW  - polymorphism
KW  - cubic
KW  - orthorhombic
KW  - monoclinic
KW  - crystallite size
UR  - https://www.mdpi.com/1996-1944/17/3/735
N2  - 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 degrees 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.
ER  -

RAVASZOVA, Simona, Karel DVOŘÁK, Martin BOHÁČ, Dalibor VŠIANSKÝ and Andrea JANČÍKOVÁ. Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs. \textit{Materials}. MDPI, 2024, vol.~17, No~3, p.~1-15. ISSN~1996-1944. Available from: https://dx.doi.org/10.3390/ma17030735.

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