HIGH-ENTROPY OXIDE INSULATORS FROM LATERITE SOIL FOR CRYOGENIC APPLICATIONS IN QUANTUM SENSORS
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Abstract
The purpose of this study is to determine if High Entropy Oxides (HEO's) made from naturally occurring Lateritic Soils are suitable for cryogenic use in quantum sensors. The multi-cation structure of the Lateritic HEO’s consists of a stable composition of Fe₂O₃ (31.8 to 37.0%), Al₂O₃ (16.8 to 19.4%) and SiO₂ (37.0 to 42.1%) with only traces of Rare Earth Elements (REE’s) (45 to 68 ppm). The presence of several oxide constituents results in very high configurational entropy values (1.20 – 1.38 J/mol·K) thus allowing for the development of insulating or stabilized phases. Overall: Experimentally derive trends indicate that the insulating properties of the laterite derived HEO's is enhanced with increasing entropy as seen by the considerable increase in their cryogenic insulating score from 4.2 to 5.4; additionally, these materials display low thermal conductivity and stable dielectric properties at cryogenic temperatures, both of which are critical for reducing thermal noise in quantum sensors. In summary: The results from the current work support the use of Lateritic Soil as a green and cost-effective alternative for creating high-entropy oxide (HEO) materials, thereby offering a pathway for environmentally sustainable development of materials that will be used in cryogenic quantum technologies.
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Publication Details
- Type of Publication:
- Conference Name: International Conference on Physics 2026
- Date of Conference: 04/09/2026 - 04/09/2026
- Venue: Department of Physics, University of Dhaka
- Organizer: Bangladesh Physical Society