Low-Temperature Sintering and Microwave Dielectric Properties of Li 2 ATi 3 O 8 (A 5 Mg, Zn) Ceramics Sumesh George and Mailadil Thomas Sebastian* Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala 695019, India New temperature-stable low-loss ceramic–glass composites based on Li 2 ATi 3 O 8 (A 5 Mg, Zn) ceramics have been pre- pared by the conventional solid-state ceramic route. The effect of lithium magnesium zinc borosilicate (LMZBS) glass addition on the sinterability, phase purity, microstructure, and microwave dielectric properties of Li 2 MgTi 3 O 8 (LMT) and Li 2 ZnTi 3 O 8 (LZT) dielectric ceramics has been investigated for low-temperature co-fired ceramic applications. The LMT13 wt% of LMZBS glass sintered at 9251C/4 h has e r 5 24.5, Q u  f 5 44,000 GHz, and t f 5 (1)0.2 ppm/1C. Addition of LZT ceramics with 3 wt% of LMZBS glass sintered at 9001C/4 h has e r 5 23.2, Q u  f 5 31,300 GHz, and t f 5 ()15.6 ppm/1C. The LMT and LZT ceramic–glass composites do not react with the commonly used silver electrode material. Introduction The ever-widening range of microwave products in the consumer electronic market is continuously pushing new devices and component manufacturers to seek advanced integration, packaging, and interconnection technologies, as size, cost, and performance are critical factors for the success of the microwave products. 1–3 Low-temperature co-fired ceramic (LTCC) technology is one of the promising technology for advanced pack- aging and multilayered structures with buried passive components for fast digital applications. 4 The benefits of LTCC technology are cost efficiency for high volumes, high packaging density, reliability, the ability to utilize highly conductive and inexpensive metallizat- ion, good dielectric thickness control, high print reso- lution of conductors, environmental stability, compact structures, integration, 2,4 and so forth. The current trend and state of the art of LTCC technology is Int. J. Appl. Ceram. Technol., 8 [6] 1400–1407 (2011) DOI:10.1111/j.1744-7402.2010.02590.x Ceramic Product Development and Commercialization r 2010 The American Ceramic Society The work was financially supported by the CSIR and DST, New Delhi, India. *mailadils@yahoo.com