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Low‐Dielectric Loss Characteristics of Nd(Co 1/2 Ti 1/2 )O 3 Ceramics at Microwave Frequencies

2007; Wiley; Volume: 90; Issue: 5 Linguagem: Inglês

10.1111/j.1551-2916.2007.01555.x

1551-2916

Ching‐Fang Tseng, Cheng‐Liang Huang, Cheng‐Hsing Hsu,

Acoustic Wave Resonator Technologies

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.