About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
High-pressure high-temperature synthesis and stability of a novel highly occupied MgAlB14-type Gd0.80B14 boride |
| Author(s) |
Zain Hussein, Irina Chuvashova, Stella Chariton, Vitali Prakapenka |
| On-Site Speaker (Planned) |
Zain Hussein |
| Abstract Scope |
MgAlB14-type borides substituted with rare-earth (RE) elements pair RE-derived magnetic and electronic behavior with exceptional hardness and thermal stability. These phases adopt the orthorhombic Imma structure, featuring a rigid network of B12 icosahedra linked by boron-boron bonds. This framework is filled with sparsely occupied metal sites that introduce structural disorder, altering electronic and thermal transport. While these metal sites traditionally host distinct elements, the structure can stabilize as a binary system with vacant secondary metal positions. We report the high-pressure high-temperature synthesis of single-crystal Gd0.80B14 in a diamond anvil cell at 21(1) GPa and 2300(200) K using X-ray diffraction. Subsequent compression and heating to 78(2) GPa and 2000(300) K show the stability of this compound under extreme conditions. The elevated Gd occupancy enhances electron donation to the boron structure and reduces structural disorder, which hasn’t been seen in similar binary RE1-xB14 compounds. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Other, Mechanical Properties |