Transparent ultra-low expansion lithium aluminosilicate glass-ceramics: Crystallization kinetics, structural and optical properties
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
View Archive Info| Field | Value | |
| Title |
Transparent ultra-low expansion lithium aluminosilicate glass-ceramics: Crystallization kinetics, structural and optical properties
|
|
| Creator |
Kumar, Anil
Chakrabarti, Anirban Shekhawat, Manoj S Molla, Atiar Rahaman |
|
| Subject |
Glass
|
|
| Description |
beta-quartz solid solution phase in the Li2O-Al2O3-SiO2-P2O5 (LAS) glass system has been precipitated by controlled heat-treatment of the parent glass prepared by melt-quench technique. Detailed crystallization kinetics of LAS glass was studied which facilitated in determination of an optimized heat-treatment protocol in order to synthesize highly transparent glass-ceramics of extremely low thermal expansion coefficient. The crystallization kinetic studies indicated a bulk nucleation with linear growth event in the LAS glasses. The LAS glass-ceramics (GCs) containing the beta-spodumene crystalline phase shows extremely low to negative thermal expansion coefficient (K-1) ranging from -0.0029 x 10(-6) to 0.3227 x 10(-6) measured in the temperature range 223 to 423 K. The glass-ceramics exhibited visible light transmittance of nearly 90%, such high transparency was possible by restricting average crystal size to nanometric scale through controlled crystallization. Microstructural characterization of the heat-treated GCs using FESEM and TEM showed nano-crystalline spherical particles of 2-3 nm, which provided a rationale for its high transparency.
|
|
| Publisher |
Elsevier
|
|
| Date |
2019-06
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cgcri.csircentral.net/4609/1/kumar2019.pdf
Kumar, Anil and Chakrabarti, Anirban and Shekhawat, Manoj S and Molla, Atiar Rahaman (2019) Transparent ultra-low expansion lithium aluminosilicate glass-ceramics: Crystallization kinetics, structural and optical properties. Thermochimica Acta, 676. pp. 155-163. ISSN 0040-6031 |
|
| Relation |
http://cgcri.csircentral.net/4609/
|
|