Abstract
The microwave dielectric properties of (1 – x) Ca 0.8 Sr 0.2 TiO 3 + xLi 0.5 Ln 0.5 TiO 3 (CST-LLT) (x = 0–1.0) (Ln: Nd, Sm) system have been investigated. The dielectric constant (ϵ r ) decreased with x increasing. The temperature coefficient of resonant frequency (τ f ) decreased almost linearly from high positive values to negative values with the increase of x. A near zero τ f was achieved at x = 0.87 for Nd and x = 0.81 for Sm ions, respectively. Optimized microwave dielectric properties (ϵ r = 111.6; Q × f = 2013 GHz; τ f = – 2.75 ppm/°C) of CST-LNT and (ϵ r = 95; Q × f = 3303 GHz; τ f = – 1.8 ppm/°C) of CST-LST were estimated at x = 0.87 and x = 0.81 respectively.
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