High permittivity and low loss dielectric ceramics Ba5LnNiNb9O30 (Ln = La, Nd and Sm)

Three novel Ba5LnNiNb9O30 (Ln=La, Nd and Sm) ceramics were prepared and characterized in the BaO-Ln2O3-NiO-Nb2O5 system. All three compounds are paraelectric phases adopting the filled tetragonal tungsten bronze (TB) structure at room temperature. At 1MHz, Ba5LnNiNb9O30 ceramics have a high dielectr...

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Bibliographic Details
Published in:Journal of alloys and compounds 2007-02, Vol.429 (1-2), p.280-284
Main Authors: LIANG FANG, MENG, S. S, HU, Chang-Zheng
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric loss and relaxation
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Permittivity (dielectric function)
Physics
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Summary:Three novel Ba5LnNiNb9O30 (Ln=La, Nd and Sm) ceramics were prepared and characterized in the BaO-Ln2O3-NiO-Nb2O5 system. All three compounds are paraelectric phases adopting the filled tetragonal tungsten bronze (TB) structure at room temperature. At 1MHz, Ba5LnNiNb9O30 ceramics have a high dielectric constants in the range 193-245.3, a low dielectric loss in range 0.0059-0.0087, and the temperature coefficients of the dielectric constant (tau) in the range -1140 to -1310ppm deg C-1.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2006.04.002