Abstract
The microwave dielectric properties of (Pb 1- x Ca x )[(Fe 0.5Nb 0.5) 1- y Zr y ]O 3 system (0.4= x=0.6; y=0.05,0.1) have been investigated at microwave frequencies. X-ray diffraction result shows single-phase specimens with an ordered ABO 3-type orthorhombic perovskite structure can be obtained using conventional solid-state reaction method in the compositions of (Pb 1- x Ca x )[(Fe 0.5Nb 0.5) 1- y Zr y ]O 3(0.4= x=0.6; y=0.05,0.1). The replacement of Zr 4+ for [Fe 3+/Nb 5+] at the B-site considerably improves the loss quality factor Q and does not remarkably affect the dielectric constant e r and the temperature coefficient of resonant frequency t f whose value of nearly 0 ppm °C −1 can be realized at x=0.55 and y=0.1.The Qf 0 value and e r for this composition are measured to be 8658 GHz and 85.3, respectively, using the close cavity resonator method.
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