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Low‐Fire Processing (Ca 1− x Nd 2 x /3 )TiO 3 Microwave Ceramics
Author(s) -
Wei ChihHung,
Jean JauHo
Publication year - 2003
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.1151-2916.2003.tb03283.x
Subject(s) - materials science , ceramic , microwave , temperature coefficient , analytical chemistry (journal) , dielectric , mineralogy , atmospheric temperature range , composite material , thermodynamics , chemistry , optoelectronics , physics , chromatography , quantum mechanics
Effects of 3ZnO·2B 2 O 3 (3Z2B) glass addition on densification and microwave properties of (Ca 1− x Nd 2 x /3 )TiO 3 (CNT‐X) have been investigated. With the 3Z2B glass content greater than 20 vol%, the densification temperature can be greatly reduced from 1400°C for pure CNT‐X to 850°–900°C for CNT‐X + 3Z2B microwave ceramics. The above result is attributed to a chemical reaction taking place at the interface of 3Z2B/CNT‐X during firing. The Ca in CNT‐X dissolves into 3Z2B, forming a new glass of CaO‐ZnO‐B 2 O 3 at 870°–880°C which enhances the densification kinetics of 3Z2B + CNT‐X microwave ceramics. For the samples with 20–40 vol% 3Z2B, the resulting 3Z2B + CNT‐X microwave ceramics have a dielectric constant ( k ) of 30–60 and a quality factor ( Q ) of 200–550 at 1–10 GHz, and a temperature coefficient of resonant frequency of 20–60 ppm/K in the temperature range of 20°–80°C.