Anisotropic Dielectric Properties of LiNb0.6Ti0.5O3 Microwave Ceramics by Screen‐Printing Templated Grain Growth

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Abstract:

In this work, anisotropic LiNb0.6Ti0.5O3 (LNT) template particles are prepared by molten salt synthesis in LiCl flux. Plate‐like particles with diameters of 5–20 μm and thicknesses of 0.5–2.0 μm synthesized at 1000°C are chosen as templates. Highly textured microwave ceramics of M‐phase LNT with tunable dielectric properties are fabricated by a novel screen‐printing templated grain growth technique (sp‐TGG), and their characteristics and dielectric properties are studied systematically. Dielectric anisotropy is observed in dielectric constant (ε r) and the temperature coefficient of dielectric constant (τ ε) at 1 MHz. LNT(//) samples exhibit lower ε r (=55.3) than randomly oriented ceramics and a positive temperature coefficient τ ε (75 ppm/°C), whereas, LNT(⊥) samples exhibit higher ε r (=83.6) and a negative temperature coefficient τ ε (= −120 ppm/°C). The textured ceramics also exhibit anisotropic and excellent properties at microwave frequency, with LNT‐M(//) showing ε r = 57.9, × f = 6325 GHz, τ f  = −14 ppm/°C and LNT‐M(⊥) showing ε r = 81.8, × f = 5751 GHz, τ f  = 43 ppm/°C. By tailoring along different directions, continuously tunable dielectric constant ranging from 55 to 83 could be obtained, and τ f could be changed from −14 to 43 ppm/°C. These findings can be technologically beneficial for wireless communication devices.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2011.04717.x

Publication date: December 1, 2011

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