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Effect of MgO and Nb2O5 co-doping on the microwave dielectric properties of Y2Ti2O7 ceramics.
- Source :
-
Ceramics International . Sep2023, Vol. 49 Issue 18, p29776-29782. 7p. - Publication Year :
- 2023
-
Abstract
- This study investigated the effects of MgO and Nb 2 O 5 co-doping on the microwave dielectric properties of Y 2 Ti 2 O 7 ceramics with a medium dielectric constant. Substituting (Mg 1/3 Nb 2/3)4+ for Ti4+ in Y 2 Ti 2 O 7 ceramics effectively enhanced the quality factor Qf. The interrelationship among the crystalline structure, microstructure, and microwave properties of Y 2 (Ti 1- x (Nb 2/3 Mg 1/3) x) 2 O 7 (0 ≤ x ≤ 0.15) sintered at 1500 °C with different holding times were examined using XRD, SEM, TEM, XPS, Raman, and network analyzer. The research findings indicate that all samples exhibited a single cubic pyrochlore phase without a second phase. Moreover, the densification temperature increased with an increase in (Mg 1/3 Nb 2/3)4+ content, and the relative density could be increased by increasing the sintering dwell time. The sample with x = 0.025 demonstrated an optimal densification temperature of 1500 °C. TEM/SAED pattern analysis revealed the existence of a "superlattice" due to the occurrence of a 1:2 cation ordering structure at high temperatures. As the dwell time was extended from 4 h to 12 h, the quality factor Qf increased from 10,830 GHz to 46,068 GHz. The sample with x = 0.025 sintered at 1500 °C for 12 h exhibited the best microwave dielectric properties ( p e r m i t t i v i t y (ε r) = 62.5, Qf = 46,068 GHz, and the temperature coefficient of frequency (TCF) = 290.8 p p m / °C). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 49
- Issue :
- 18
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 169854012
- Full Text :
- https://doi.org/10.1016/j.ceramint.2023.06.233