Influence of substitutions and Sintering Aids on Structural and Electromagnetic Properties of NiCuZn Ferrite (Record no. 74208)

000 -LEADER
fixed length control field nam a22 7a 4500
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20170707115102.0
006 - FIXED-LENGTH DATA ELEMENTS--ADDITIONAL MATERIAL CHARACTERISTICS--GENERAL INFORMATION
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008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 170706b2009 xxu||||| m||| 00| 0 eng d
041 ## - LANGUAGE CODE
Language code of text/sound track or separate title eng
100 ## - MAIN ENTRY--AUTHOR NAME
Personal name Roy, Pradip Kumar
Roll Number/Miscellaneous information 50408004
245 ## - TITLE STATEMENT
Title Influence of substitutions and Sintering Aids on Structural and Electromagnetic Properties of NiCuZn Ferrite
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Year of publication 2009
300 ## - PHYSICAL DESCRIPTION
Number of Pages 150 p.
502 ## - DISSERTATION NOTE
Degree Type Thesis (Ph.D)-
Name of granting institution National Institute of Technology, Rourkela
520 ## - SUMMARY, ETC.
Summary/Abstract, etc NiCuZn ferrite is the most important magnetic materials used for the manufacturing of multilayer chip inductors. The present work is focused on the influence of substitutions and sintering aids on electromagnetic properties of NiCuZn ferrite. (Ni0.8−xCu0.2Znx)Fe2O4 ferrites with 0.45≤x≤0.60 compositions were studied to<br/>optimize Zn concentration. The effects of Mg2+ substitution for Ni2+ and La3+, Sm3+ substitutions for Fe3+ on the electromagnetic properties of optimized NiCuZn ferrite<br/>were investigated. The effects of sintering aids like V2O5, Bi2O3 and MoO3 on the densification kinetics and electromagnetic properties of the ferrite were also<br/>investigated. Ferrite specimens were synthesized by nitrate-citrate sol-gel auto combustion process. Nanocrystalline ferrite powder was successfully synthesized by self<br/>propagating combustion method. The process resulted in the formation of nano-sized (19-22 nm), highly reactive (specific surface area- 40-50 m2/gm) and crystalline<br/>spinel ferrite powders. The ferrite powders also showed good sinterability at around <950°C. On the basis of good permeability as well as resistivity,Ni0.25Cu0.2Zn0.55)Fe2O4 composition was optimized. The composition showed, initial<br/>permeability of about 111 and the resistivity of about 8.9 MΩ-cm at 100 kHz with frequency stability up to ~10 MHz.<br/>An improved electromagnetic property of the Mg substituted ferrite was found in (Ni0.07Mg0.18Cu0.2Zn0.55)Fe2O4 nominal composition. The initial permeability, saturation magnetization and resistivity were of about 2420, 85 emu/gm and 10 MΩ- cm at 100 kHz respectively in this composition. The improved electromagnetic properties of the composition might be due to the lowering of magnetostriction<br/>constant by Mg substitution and partly due to better densification. La substitution in the ferrite mainly produced grain boundary secondary phase LaFeO3. However, bulk density and grain size of the ferrite increased with La<br/>vii substitution up to 3.75 atom%. A significant increase in initial permeability (~ 424),saturation magnetization (~ 66 emu/gm) and resistivity (~ 69 MΩ-cm at 100 kHz) was<br/>found in (Ni0.25Cu0.2Zn0.55)La0.025Fe1.975O4 composition. The increased permeability might be due to the combined effect of increased grain size, increased densification,<br/>decreased anisotropy and compressive macro-stresses, etc. The La solubility in the ferrite lattice was very low (~ 0.1 atom/unit cell). The Sm substitution showed the formation of secondary phase SmFeO3 in the ferrites. Bulk density and grain size of the ferrites increased with increasing Sm substitution up to 2.5 atom%. Electromagnetic properties were maximized in (Ni0.25Cu0.2Zn0.55)Sm0.05Fe1.95O4 composition. An initial permeability of about 312,saturation magnetization of about 70 emu/gm and resistivity of about 54 MΩ-cm at 100 kHz were measured in the composition. V2O5 exhibited better densification behavior among all sintering aids with an<br/>onset sintering temperature of ~ 825°C. The electromagnetic properties of the ferrite were also better in this V2O5 doped ferrites.
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Engineering and Technology
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Ceramic Engnieering
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Ceramic Materials
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name Bera, Japes
Relator term Supervisor
710 ## - ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Department of Ceramic Engineering
856 ## - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier http://ethesis.nitrkl.ac.in/1548/
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type Thesis (Ph.D/M.Tech R)
Holdings
Withdrawn status Damaged status Collection code Permanent Location Current Location Shelving location Date acquired Accession Number Koha item type
    Reference BP Central Library BP Central Library Thesis Section 06/07/2017 T64 Thesis (Ph.D/M.Tech R)

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