Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

High Q Microwave Dielectric Ceramics in (Ni1−x Znx)Nb2O6 System

Abstract: (Ni1−xZnx)Nb2O6, 0≤x≤10, ceramics with >97% density were prepared by a conventional solid-state reaction, followed by sintering at 1200°–1300°C (depending on the value of x) The XRD patterns of the sintered samples (0≤x≤10) revealed single-phase formation with a columbite (Pbcn) structure The unit cell volume slightly increased with increasing Zn content (x) All the compositions showed high electrical resistivity (ρdc=16±03 × 1011Ω·cm) The microwave (4–5 GHz) dielectric properties of (Ni1−xZnx)Nb2O6 ceramics exhibited a significant dependence on the Zn content and to some extent on the morphology of the grains As x was increased from 0 to 1, the average grain size monotonically increased from 76 to 212 μm and the microwave dielectric constant (ɛ′r) increased from 236 to 261, while the quality factors (Qu×f) increased from 18 900 to 103 730 GHz and the temperature coefficient of resonant frequency (τf) increased from −62 to −73 ppm/°C In the present work, we report the highest observed values of Qu×f=103 730 GHz, and ɛ′r=261 for the ZnNb2O6-sintered ceramics