The Resource Sintering and microstructure control of a ferrimagnetic Mn-Zn ferrite spinel

Sintering and microstructure control of a ferrimagnetic Mn-Zn ferrite spinel

Label
Sintering and microstructure control of a ferrimagnetic Mn-Zn ferrite spinel
Title
Sintering and microstructure control of a ferrimagnetic Mn-Zn ferrite spinel
Creator
Language
eng
Summary
"The effect of minor additions of CaO dopant to a manganese zinc ferrite - Zn[subscript .25] Mn[subscript .75] Fe[subscript 2.17] O[subscript 4.0] - on its grain growth and densification kinetics in air at 1250°C., 1300°C., and 1350°C. was studied. Grain growth was controlled over a range of dopant levels. At a sintering temperature of 1350°C. and time of six hours a ferrite with the smallest dopant addition was sintered to the highest density - 98% of theoretical. Under the same sintering conditions ferrites with higher dopant levels also sintered with normal growth but sintered to lower densities. Due to discontinuous grain growth the ferrite without dopant additions sintered (at 1350°C. for six hours) to densities less than 98% of theoretical. In vacuum or nitrogen-oxygen gas mixture (P[subscript O2] = 10−3 atm.) the sintered density was 95% of theoretical. In vacuum or nitrogen-oxygen gas mixture (P[subscript O2] =10−2 atm.) the sintered density was 93.5% of theoretical. In air the sintered density was 90% of theoretical. Intermediate stage sintering and grain growth models were applied to the densification and grain growth data for the doped ferrite. It appears that the effect of the dopant is to reduce the diffusion coefficient of oxygen-reducing the densification rate and to control grain growth by decreasing the grain boundary mobility. Magnetic hysteresis loops were obtained for several doped ferrite toroids sintered to densities ranging from 91% of theoretical to 98% of theoretical. It was found that the maximum magnetic induction, B[subscript max], increased with increasing sintered density and increasing grain size and reached a maximum of 5400 gauss at a sintered density of 98% of theoretical. It was found that the coercive force, H[subscript c], decreased with increasing sintered density and increasing grain size and reached a minimum of 0.3 oersteds at a sintered density of 98% of theoretical"--Abstract, leaves ii-iii
Related
Member of
http://library.link/vocab/creatorDate
1946-
http://library.link/vocab/creatorName
Michel, Joel Keith
Degree
M.S.
Dissertation year
1973.
Granting institution
University of Missouri--Rolla
Index
no index present
Literary form
non fiction
Label
Sintering and microstructure control of a ferrimagnetic Mn-Zn ferrite spinel
Instantiates
Publication
Carrier category
volume
Carrier category code
  • nc
Carrier MARC source
rdacarrier.
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent.
Control code
6028456
Extent
127 pages.
Media category
unmediated
Media MARC source
rdamedia.
Media type code
  • n
Label
Sintering and microstructure control of a ferrimagnetic Mn-Zn ferrite spinel
Publication
Carrier category
volume
Carrier category code
  • nc
Carrier MARC source
rdacarrier.
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent.
Control code
6028456
Extent
127 pages.
Media category
unmediated
Media MARC source
rdamedia.
Media type code
  • n

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      37.955220 -91.772210
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