| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Materials for Energy Conversion and Storage VI
|
| Presentation Title |
E-22: Microwave Dielectric Properties of Isovalent and Aliovalent Ions Doped Ca4(La4Pr2)(SiO4)4(PO4)2O2 Ceramics |
| Author(s) |
Sea Fue Wang, Yung Jen Lin, Bo Cheng Lai, Hong Bo Yang, Jia Min Chen |
| On-Site Speaker (Planned) |
Sea Fue Wang |
| Abstract Scope |
Isovalent and aliovalent substitutions in the cationic and anionic sites of Ca4(La4Pr2)(SiO4)4(PO4)2O2 ceramics were explored in this study. Substitutions of (SiO4)4- ions with (GeO4)4- in Ca4(La4Pr2)(SiO4)4(PO4)2O2 ceramic increased its densification temperature and thus led to a significant grain growth; however, replacement of Ca2+ and (PO4)3- ions by Mg2+ ions and (VO4)3- ions, respectively, decreased its densification temperature and resulted in grain refinement. Various rare-earth-metal and (WO4)2- ion substitutions on La3+ and Pr3+ and (PO4)3- sites, respectively, of Ca4(La4Pr2)(SiO4)4(PO4)2O2 ceramic had no impact on the sintering temperature. In the case of Ca4(La4Pr2)(SiO4)4(PO4)2O2 apatite with Mg2+ and (WO4)2- ion substitutions, second phases were observed in the X-ray diffraction patterns; however, only the pure hexagonal apatite phase with space group P63/m was visible in all the other systems. Overall, Ca4(La2Nd2Pr2)(SiO4)4(PO4)2O2 ceramic has the best microwave dielectric properties including εr = 14.2, Q × f = 28,745 GHz and τf = 0.9 ppm/°C. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |