Microwave dielectric properties of MO–La2O3–TiO2 (M = Ca, Sr, Ba) ceramics | Zendy

I. N. Jawahar | Zendy; N. Santha | Zendy; M. T. Sebastian | Zendy; P. Mohanan | Zendy

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Microwave dielectric properties of MO–La₂O₃–TiO₂ (M = Ca, Sr, Ba) ceramics

Author(s) -

I. N. Jawahar,

N. Santha,

M. T. Sebastian,

P. Mohanan

Publication year - 2002

Publication title -

journal of materials research/pratt's guide to venture capital sources

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.788

H-Index - 148

eISSN - 0884-2914

pISSN - 0884-1616

DOI - 10.1557/jmr.2002.0446

Subject(s) - materials science , orthorhombic crystal system , ceramic , dielectric , analytical chemistry (journal) , crystallite , microwave , mineralogy , diffraction , optics , metallurgy , optoelectronics , chemistry , physics , chromatography , quantum mechanics

Single-phase polycrystalline ceramics in the MO-La 2 O 3 -TiO 2 (M = Ca, Sr, Ba) system, such as cation-deficient hexagonal perovskites CaLa 4 Ti 4 O 1 5 , SrLa 4 Ti 4 O 1 5 , BaLa 4 Ti 4 O 1 5 , and Ca 2 La 4 Ti 5 O 1 8 and the orthorhombic phases CaLa 4 Ti 5 O 1 7 and CaLa 8 Ti 9 O 3 1 , were prepared through the solid-state ceramic route. The phases and structure of the ceramics were analyzed through x-ray diffraction and scanning electron microscopy. The microwave dielectric properties of the ceramics were studied using a network analyzer. The investigated ceramics show high ∈ r in the range 42 to 54, high quality factors with Q xf in the range 16,222 to 50,215 GHz, and low τ f in the range -25 to +6 ppm/°C. These high dielectric constant materials with high Q xf up to 50,215 GHz are suitable for applications where narrow bandwidth and extremely low insertion loss is necessary, especially at frequencies around 1.9 GHz.

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