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Sintering behavior, phase structure and microwave dielectric properties of novel glass-free low-temperature cofiring NaCaLn(MoO4)3(Ln = Nd, Sm) ceramics.
- Source :
-
Ceramics International . Feb2024, Vol. 50 Issue 4, p6508-6516. 9p. - Publication Year :
- 2024
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Abstract
- Novel glass-free low-temperature cofiring NaCaLn(MoO 4) 3 (Ln = Nd, Sm) ceramics were prepared by a conventional solid-state reaction method, and their sintering characteristics, phase composition, micro-morphology and microwave dielectric properties were comprehensively investigated. The pure tetragonal scheelite structure of NaCaLn(MoO 4) 3 (Ln = Nd, Sm) ceramics were disclosed by the XRD patterns. The extremely dense micro-morphology was revealed in the SEM images, which corresponds to the density measurements results. Those results showed that the change of ε r values is closely related to relative density and molecular polarizability. The change in Q × ƒ value are considered influenced by both grain size and packing fraction. In addition, the largest contribution of Mo–O bonds to the Q × ƒ of NaCaLn(MoO 4) 3 (Ln = Nd, Sm) ceramics was revealed by P–V–L theory. The best dielectric properties were obtained at 850 °C and 875 °C for NaCaNd(MoO 4) 3 and NaCaSm(MoO 4) 3 , respectively: ε r = 11.06, Q × ƒ = 58,442 GHz, τ ƒ = −37.7 ppm/°C and ε r = 11.02, Q × ƒ = 47,190 GHz, τ ƒ = −43.8 ppm/°C. Furthermore, the good compatibility of these two ceramics with silver powder indicated that they have potential for LTCC applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 50
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 174580495
- Full Text :
- https://doi.org/10.1016/j.ceramint.2023.11.397