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Formation Process and Microwave Dielectric Properties of the R 2 V 2 O 7 (R=Ba, Sr, and Ca) Ceramics
Author(s) -
Joung MiRi,
Kim JinSeong,
Song MyungEun,
Nahm Sahn,
Paik JongHoo
Publication year - 2009
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.1551-2916.2009.03324.x
Subject(s) - triclinic crystal system , ceramic , microstructure , materials science , analytical chemistry (journal) , dielectric , microwave , homogeneous , mineralogy , crystallography , crystal structure , chemistry , metallurgy , physics , thermodynamics , optoelectronics , chromatography , quantum mechanics
Formation process and microwave dielectric properties of the R 2 V 2 O 7 (R=Ba, Sr, and Ca) ceramics were investigated. Transient RV 2 O 6 phases, which were formed at 300°∼500°C by the reaction of RCO 3 and V 2 O 5 , interacted with remnant RCO 3 to form the homogeneous triclinic R 2 V 2 O 7 phases at 600°–700°C. The Sr 2 V 2 O 7 and Ca 2 V 2 O 7 ceramics sintered at 1000° and 950°C, respectively, for 10 h showed a dense microstructure with the microwave dielectric properties of ɛ r =10.4–12.1, Q × f =15 200–19 520 GHz, and τ f =−30.9–34.8 ppm/°C. However, the Ba 2 V 2 O 7 ceramic was well sintered at 900°C for 10 h and it showed the good microwave dielectric properties of ɛ r =10.1, Q × f =51 630 GHz, and τ f =−26.5 ppm/°C.