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Low‐Dielectric Loss Characteristics of Nd(Co 1/2 Ti 1/2 )O 3 Ceramics at Microwave Frequencies
Author(s) -
Tseng ChingFang,
Huang ChengLiang,
Hsu ChengHsing
Publication year - 2007
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/j.1551-2916.2007.01555.x
Subject(s) - ceramic , materials science , microwave , microstructure , sintering , analytical chemistry (journal) , dielectric , q value , mineralogy , metallurgy , chemistry , optoelectronics , physics , chromatography , quantum mechanics , nuclear physics
The microwave dielectric properties and the microstructures of Nd(Co 1/2 Ti 1/2 )O 3 (NCT) ceramics using starting powders of Nd 2 O 3 , CoO, and TiO 2 prepared by the conventional solid‐state route have been researched. The dielectric constant values (ɛ r ) saturated at 24.8–27. Quality factor ( Q × f ) values of 37 900–140 000 (at 9 GHz) and the measured τ f values ranging from −45 to −48 ppm/°C can be obtained when the sintering temperatures are in the range of 1410°–1500°C. The ɛ r value of 27, the Q × f value of 140 000 (at 9 GHz) and the τ f value of −46 ppm/°C were obtained for NCT ceramics sintered at 1440°C for 4 h. For applications of high selective microwave ceramic resonator, filter, and antenna, NCT is proposed as a suitable material candidate.