Cold sintered LiMgPO4 based composites for low temperature co‐fired ceramic (LTCC) applications

Wang, Dawei; Chen, Jinrong; Wang, Ge; Lu, Zhilun; Sun, Shikuan; Li, Jinglei; Jiang, Juan; Zhou, Di; Song, Kaixin; Reaney, Ian M.

Abstract

Cold sintered, Li2MoO4-based ceramics have recently been touted as candidates for electronic packaging and low temperature co-fired ceramic (LTCC) technology but MoO3 is an expensive and endangered raw material, not suited for large scale commercialization. Here, we present cold sintered temperature-stable composites based on LiMgPO4 (LMP) in which the Mo (and Li) concentration has been reduced, thereby significantly decreasing raw material costs. Optimum compositions, 0.5LMP-0.1CaTiO3-0.4K2MoO4 (LMP-CTO-KMO), achieved 97% density at <300°C and 600 MPa for 60 minutes. Raman spectroscopy, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray mapping confirmed the coexistence of end-members, LMP, CTO, and KMO, with no interdiffusion and parasitic phases. Composites exhibited temperature coefficient of resonant frequency ~ –6 ppm/°C, relative permittivity ~9.1, and Q × f values ~8500 GHz, properties suitable for LTCC technology and competitive with commercial incumbents.

Citation

Wang, D., Chen, J., Wang, G., Lu, Z., Sun, S., Li, J., Jiang, J., Zhou, D., Song, K., & Reaney, I. M. (2020). Cold sintered LiMgPO4 based composites for low temperature co‐fired ceramic (LTCC) applications. Journal of the American Ceramic Society, 103(11), 6237-6244. https://doi.org/10.1111/jace.17320

• Journal Article Type: Article
• Acceptance Date: Jun 10, 2020
• Online Publication Date: Jul 16, 2020
• Publication Date: 2020-11
• Deposit Date: Oct 23, 2021
• Publicly Available Date: Oct 25, 2021
• Journal: Journal of the American Ceramic Society
• Print ISSN: 0002-7820
• Electronic ISSN: 1551-2916
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 103
• Issue: 11
• Pages: 6237-6244
• DOI: https://doi.org/10.1111/jace.17320
• Keywords: cold sintering, LTCC, microwave dielectric ceramics, phosphates
• Public URL: http://researchrepository.napier.ac.uk/Output/2815723