Influence of Sm substitution on the phase, microstructure and microwave dielectric properties of SrLa4Ti5O17

• DOI: 10.1007/s10854-011-0372-3
• Publication Date: 2011-04-18T05:41:28Z
• Authors: A. Manan; Y. Iqbal
• Keywords: 0103 physical sciences; 01 natural sciences

New dielectric ceramics in the SrLa4−xSmxTi5O17 (0 ≤ x ≤ 4) composition series were prepared through a solid state mixed oxide route to investigate the effect of Sm+3 substitution for La+3 on the phase, microstructure and microwave dielectric properties. At x = 0–3, all the compositions formed single phase ceramics within the detection limit of in-house X-ray diffraction when sintered in the temperature range 1500–1580 °C. At x = 4, a mixture of Sm2Ti2O7 and SrTiO3 formed. The maximum Sm+3-containing single phase ceramics, SrLaSm3Ti5O17, exhibited relative permittivity (er) = 42.6, temperature coefficient of resonant frequency (τ f ) = −96 ppm/oC and quality factor (Q u f o ) = 7332 GHz. An analysis of results presented here indicates that SrLa4−xSmxTi5O17 ceramics, exhibiting τ f ~ 0 and er ~ 53 could be achieved at x ~ 1.4 but at the cost of decrease in Q u f o .