Details

Autor(en) / Beteiligte

• Xie, Meng-Qi
• Song, Xiao-Qiang
• Du, Kang
• Zou, Zheng-Yu
• Lu, Wen-Zhong
• Lei, Wen

Titel

Improved microwave dielectric properties of the (Sr1−3x/2Lax)2Ti1−yCeyO4 ceramics

Ist Teil von

• Journal of materials science. Materials in electronics, 2020-08, Vol.31 (16), p.13541-13548

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• (Sr 1 − 3 x /2 La x ) 2 TiO 4 ceramics (0 ≤  x  ≤ 0.02) with the tetragonal Ruddlesden-Popper structure (I4/mmm) were synthesized through the conventional solid-state methods. The phase composition, chemical structure and the microwave dielectric properties of the (Sr 1 − 3 x /2 La x ) 2 TiO 4 ceramics were investigaed. The single phase was obtained for x  < 0.02. The substitution of La 3+ for Sr 2+ could decrease the ionic polarizability and the cell volume, Which slightly decrease the dielectric constant ( ε r ), the quality factor ( Q  ×  f ) were closely related to the packing fraction, while the temperature coefficient of resonant frequency ( τ f ) is correlated to the tolerance factor. Which attributed to the increase of the Q  ×  f value and the decrease of the τ f value. The optimum microwave dielectric properties for (Sr 1-3 x /2 La x ) 2 TiO 4 were obtained in x  = 0.015 ( ε r  = 34.07, Q  ×  f  = 86,450 GHz and τ f  =  + 91.8 ppm/ o C). Besides, in order to further decrease the τ f  value, the Sr 1.955 La 0.03 Ti 1 − y Ce y O 4 ceramics were also synthesized through the conventional solid-state methods. A near-zero τ f value was achieved in y  = 0.7 ( ε r  = 20.18, Q  ×  f  = 87651 GHz and τ f  =   −  0.2 ppm/°C).