Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs
Tricalcium aluminate is an important phase of Portland clinker. In this paper, three polymorphs of C<sub>3</sub>A 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 Na<sub>2</sub&...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-02-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/17/3/735 |
| _version_ | 1797318468269244416 |
|---|---|
| author | Simona Ravaszová Karel Dvořák Martin Boháč Dalibor Všianský Andrea Jančíková |
| author_facet | Simona Ravaszová Karel Dvořák Martin Boháč Dalibor Všianský Andrea Jančíková |
| author_sort | Simona Ravaszová |
| collection | DOAJ |
| description | Tricalcium aluminate is an important phase of Portland clinker. In this paper, three polymorphs of C<sub>3</sub>A 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 Na<sub>2</sub>O 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 C<sub>3</sub>A phases; these phases arise at the same time and overlap each other in the areas of their formation at different Na doses. |
| first_indexed | 2024-03-08T03:52:50Z |
| format | Article |
| id | doaj.art-8513bf4d29ce47be9bf77ec636e88a4b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T03:52:50Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-8513bf4d29ce47be9bf77ec636e88a4b2024-02-09T15:17:55ZengMDPI AGMaterials1996-19442024-02-0117373510.3390/ma17030735Formation, Stability, and Crystallinity of Various Tricalcium Aluminate PolymorphsSimona Ravaszová0Karel Dvořák1Martin Boháč2Dalibor Všianský3Andrea Jančíková4Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech RepublicFaculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech RepublicResearch Institute for Building Materials, Hněvkovského 30/65, 617 00 Brno, Czech RepublicDepartment of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 267/2, 611 37 Brno, Czech RepublicFaculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech RepublicTricalcium aluminate is an important phase of Portland clinker. In this paper, three polymorphs of C<sub>3</sub>A 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 Na<sub>2</sub>O 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 C<sub>3</sub>A phases; these phases arise at the same time and overlap each other in the areas of their formation at different Na doses.https://www.mdpi.com/1996-1944/17/3/735tricalcium aluminatepolymorphismcubicorthorhombicmonocliniccrystallite size |
| spellingShingle | Simona Ravaszová Karel Dvořák Martin Boháč Dalibor Všianský Andrea Jančíková Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs Materials tricalcium aluminate polymorphism cubic orthorhombic monoclinic crystallite size |
| title | Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs |
| title_full | Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs |
| title_fullStr | Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs |
| title_full_unstemmed | Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs |
| title_short | Formation, Stability, and Crystallinity of Various Tricalcium Aluminate Polymorphs |
| title_sort | formation stability and crystallinity of various tricalcium aluminate polymorphs |
| topic | tricalcium aluminate polymorphism cubic orthorhombic monoclinic crystallite size |
| url | https://www.mdpi.com/1996-1944/17/3/735 |
| work_keys_str_mv | AT simonaravaszova formationstabilityandcrystallinityofvarioustricalciumaluminatepolymorphs AT kareldvorak formationstabilityandcrystallinityofvarioustricalciumaluminatepolymorphs AT martinbohac formationstabilityandcrystallinityofvarioustricalciumaluminatepolymorphs AT daliborvsiansky formationstabilityandcrystallinityofvarioustricalciumaluminatepolymorphs AT andreajancikova formationstabilityandcrystallinityofvarioustricalciumaluminatepolymorphs |