Structural investigation and improvement of microwave dielectric properties in Ca(HfxTi1-x)O3 ceramics

被引：40

作者：

Zaman, Abid ^{[1
]}

Uddin, Sarir ^{[2
]}

Mehboob, Nasir ^{[1
]}

Ali, Asad ^{[1
]}

机构：

[1] Riphah Int Univ, Dept Phys, Islamabad 44000, Pakistan

[2] Govt Coll Hayatabad, Dept Phys, Peshawar 25000, Pakistan

来源：

PHYSICA SCRIPTA | 2021年 / 96卷 / 02期

关键词：

CaTiO3; HfO2-doped CaTiO3; Crystal structure; Microstructure; Dielectric Properties; MICROSTRUCTURE; CATIO3; DEPENDENCE; SR;

D O I：

10.1088/1402-4896/abce74

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Calcium hafnium titanate, Ca(HfxTi1-x)O-3 (CHT) was prepared using the conventional solid state reaction route. The X-ray diffraction patterns were used for analyzing the phase compositions. The XRD patterns revealed the arrangement of a single phase perovskite structure and therefore the structure is transformed from non-centrosymmetric orthorhombic (Pbnm) to centrosymmetric cubic (Pm-3m) at 0.4 <= x. Lattice parameter, crystallite size, densities and porosity were calculated. The SEM morphology of CHT at various hafnium (x), which is comprises of round-rod shaped grains with small pores microstructure. The substitution of Hf4+ ions over Ti4+, the microwave dielectric constant (e(r)) decreases from 145 to 52, while the quality factor (Qxf) increases from 8105 to 24305 GHz and temperature coefficient of resonant frequency tuned towards zero tau(f) similar to 4.5 ppm degrees C-1. Good combination of microwave dielectric material properties was accomplished for the composition x = 0.8 (at 3 GHz).

引用

页数：10

共 29 条

[1] Effect of hafnium on the microstructure, dielectric and ferroelectric properties of Ba[Zr0.2Ti0.8]O3 ceramics [J].