title: Crystal structure and microwave dielectric behaviors of ultra-low-temperature fired x(Ag(0.5)Bi(0.5))MoO₄-(1 - x)BiVO₄ (0.0 ≤ x ≤ 1.0) solid solution with scheelite structure.
abstract: x(Ag(0.5)Bi(0.5))MoO4-(1 - x)BiVO4 (0.0 ≤ x ≤ 1.0) ceramics were prepared by using the solid-state reaction technique. Ceramics with x < 0.10 had a monoclinic scheelite structure, while those with ≥0.10 were tetragonal scheelite solid solutions. This indicates that the phase transformation temperature of BiVO4 was lowered through the formation of a solid solution. The thermal expansion data of the x = 0.08 sample showed that the thermal expansion coefficient was increased suddenly from +8 to +15 ppm/°C at about 60.6 °C due to the phase transition. Similarly, a maximum value of microwave dielectric permittivity was revealed at about 65 °C for the x = 0.08 sample. All of the ceramics could be well sintered below 700 °C. Good microwave dielectric behaviors, with relative permittivity >75 and Q(f) > 9000 GHz, were obtained in ceramics with compositions near x = 0.10. Both the THz data and the infrared spectra were used to study the intrinsic dielectric behavior of the materials at microwave frequencies.
authors.affiliation: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049 Shaanxi, People's Republic of China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhou
authors.forename: Li-Xia
authors.initials: LX
authors.lastname: Pang
authors.forename: Ze-Ming
authors.initials: ZM
authors.lastname: Qi