<span style="font-size: 21.5pt;mso-bidi-font-size:14.5pt;font-family:"Times New Roman","serif"">AC electrical conductivity study of Nd^{<span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:"Times New Roman","serif"">3</span>}^{<span style="font-size:17.5pt;mso-bidi-font-size:10.5pt;font-family:"Arial","sans-serif"">+</span>}<span style="font-size:17.5pt;mso-bidi-font-size:10.5pt;font-family:"Arial","sans-serif""> <span style="font-size:21.5pt;mso-bidi-font-size:14.5pt;font-family: "Times New Roman","serif"">substituted Zn-Mg ferrite system </span></span></span>

419-421<span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">Compositions of polycrystalline ferrites, ZnxMg1-xFe2-yNdyO4 (x <span style="font-size:19.5pt;mso-bidi-font-size:12.5pt;font-family: " times="" new="" roman","serif""="">= <span style="font-size:16.0pt;mso-bidi-font-size: 9.0pt;font-family:" times="" new="" roman","serif""="">0.00, 0.20, 0.40, 0.60, 0.80 and 1.00; y <span style="font-size:19.5pt;mso-bidi-font-size:12.5pt; font-family:" times="" new="" roman","serif""="">= <span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">0.00 and 0.10), have been prepared by standard ceramic method. On characterization by standard tools like X-ray diffraction, SEM and IR absorption, the formation of single phase cubic spinels has been confirmed. Dielectric constant (ϵ') and dielectric <span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">loss (tanδ) were measured with variation of applied frequency in the range from 20 Hz to 1 MHz at room temperature. The plots of ϵ<span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" arial","sans-serif""="">' and tanδ show sharp dispersion at lower frequencies and almost level off at higher frequencies. This is attributed to the interfacial polarization. From compositional dependence study, it was found that the dielectric constant (ϵ') follows increasing trend with increasing zinc concentration whereas decreasing trend with Nd<span style="font-size:13.0pt;mso-bidi-font-size:6.0pt; font-family:" times="" new="" roman","serif""="">3+ substitution. This is explained by <span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">conduction mechanism wherein population of hopping electrons at crystallographically equivalent site, octahedral <span style="font-size:15.0pt;mso-bidi-font-size: 8.0pt;font-family:" arial","sans-serif""="">(B) <span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">site, is considered. </span

Room temperature Ni 0.8 Zn 0.2 Fe 2 O 4 Thick FilmChlorine Sensor

Abstract: The nano crystalline Ni 0.8 Zn 0.2 Fe 2 O 4 powder was prepared by co-precipitation method and deposited on alumina substrate by screen printing method. The powder was characterized by XRD, FT-IR and SEM techniques. The XRD study shows the cubic spinel structure. The crystallite size is 26.32nm. The FT-IR spectrum shows two absorption bands near 400cm -1 and 600cm -1 corresponding to tetrahedral and octahedral sites respectively. The SEM study shows irregular shape grainsand average size is 0.85µm. The ferrite thick films show higher sensitivity to Cl 2 than ethanol and LPG at room temperature

A review of spinel-type of ferrite thick film technology : fabrication and application

Ferrites have emerged out as excellent material for a broad spectrum of applications. Thick films of these materials have great demand for energy and advanced electronics. This review highlights a brief overview of the spinel-type of ferrite thick films (S-FTFs) development right from their historical developments, preparation strategies and state of art applications. The fabrication of S-FTFs includes the discussion on screen-printing, doctor blade tape casting, plasma spray, and spin coating. The comparative analysis of the screen printing technique to the other methods is provided to assist the scientific community during the process of choosing the most suitable fabrication technique. The influence of the synthesis parameters such as temperatures (pre-sintering and final sintering), binders (organic and inorganic), sizes (crystallite, grain, and particle), substrate material and the final heat treatment process in S-FTFs, and the preparation of the ferrite powders and their fabrication technique are review and summarized. Moreover, this review provides a brief overview of the S-FTFs applications, which are classified into four broad categories: sensors, microwave, magnetic and advanced applications. This classification provides a deeper insight into the potential of the S-FTF applications. The motivation in materializing the review of S-FTFs technology is to inspire aspiring research candidates and boost their research interest in this particular field