Crystal Structure and Microwave Dielectric Properties of (1-x)La(Zn1/2Ti1/2)O3-xSrTiO3 System.
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The crystal structure and microwave dielectric properties of the (1-x)La(Zn<SUB>1/2</SUB>Ti<SUB>1/2</SUB>)O<SUB>3</SUB>-xSrTiO<SUB>3</SUB> system were investigated using X-ray powder diffraction and a network analyzer. The crystal structure of the solid solution approached that of a cubic perovskite with an increasing amount of SrTiO<SUB>3</SUB>. B-site cation ordering, in-phase tilting, and anti-phase tilting of oxygen octahedra disappeared at x=0.4, 0.6, and 0.9, respectively. The relative permittivity (ε <SUB>r</SUB>) and temperature coefficient of resonant frequency (τ <SUB>f</SUB>) of the solid solutions showed a nonlinear variation with no singularity. In particular, ε <SUB>r</SUB> varied according to the mixture rule, 1/ε <SUB>total</SUB>=v<SUB>1</SUB>/ε <SUB>1</SUB>+v<SUB>2</SUB>/ε <SUB>2</SUB>. This anomalous behavior was attributed to the structural characteristics of the system. The variation in τ <SUB>f</SUB> of the system is discussed in conjunction with other researchers' works.
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公益社団法人 応用物理学会 | 論文
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