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Pseudo Phase Diagram and Microwave Dielectric Properties of Li 2 O–MgO–TiO 2 Ternary System
Author(s) -
Zhang YiDing,
Zhou Di
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14402
Subject(s) - materials science , phase diagram , dielectric , ceramic , ternary operation , ternary numeral system , sintering , ternary plot , mineralogy , microwave , analytical chemistry (journal) , phase (matter) , composite material , chemistry , optoelectronics , telecommunications , organic chemistry , chromatography , computer science , programming language
Li 2 O–MgO–TiO 2 ternary system is an important microwave dielectric ceramic material with excellent properties and prospect in both scientific research and application. A phase diagram of the Li 2 O–MgO–TiO 2 ternary system was established in this article, based on earlier research results and our present work. Microwave dielectric properties with compositions in different regions of the phase diagram have been analyzed. We found that the 0.33 Li 2 MgTi 3 O 8 –0.67 Li 2 TiO 3 ceramics sintered at 1200°C exhibited excellent dielectric properties: Q × f value = 80 476 GHz (at 7.681 GHz), ε r = 24.7, τ f = +3.2 ppm/°C. We also designed two ceramic systems in the Li‐rich region of the Li 2 O–MgO–TiO 2 ternary system, which received little attention in the past decades, because many excellent single‐phase ceramics, such as Li 2 MgTiO 4 , Li 2 MgTi 3 O 8 and MgTiO 3 , have been found in the Ti‐rich region. The ceramic systems have low sintering temperatures but also relatively poor dielectric properties.