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OPTICAL PROPERTIES OF SOME METAL-INS...

NOH, TAE WON.

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OPTICAL PROPERTIES OF SOME METAL-INSULATOR COMPOSITES.

Record Type:	Electronic resources : Monograph/item
Title/Author:	OPTICAL PROPERTIES OF SOME METAL-INSULATOR COMPOSITES./
Author:	NOH, TAE WON.
Description:	193 p.
Notes:	Source: Dissertation Abstracts International, Volume: 47-05, Section: B, page: 2048.
Contained By:	Dissertation Abstracts International47-05B.
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8618825

OPTICAL PROPERTIES OF SOME METAL-INSULATOR COMPOSITES.
NOH, TAE WON.

OPTICAL PROPERTIES OF SOME METAL-INSULATOR COMPOSITES. - 193 p.

Source: Dissertation Abstracts International, Volume: 47-05, Section: B, page: 2048.

Thesis (Ph.D.)--The Ohio State University, 1986.

Ni-MgO granular composites were prepared by coprecipitation of NiO-MgO solid solutions and their preferential reduction in a hydrogen atmosphere. Measured reflection spectra of the composites were better described by the Effective Medium Approximation (EMA) than by the Maxwell-Garnett theory (MGT). The conductivities and the dielectric constants were derived by a Kramers-Kronig transformation, and they showed a qualitative agreement with the EMA. In the far-infrared region, the percolation transition was observed in the reflection spectra, and also seen in the derived conductivities and the dielectric constants.Subjects--Topical Terms:

3173567
Condensed matter physics.

OPTICAL PROPERTIES OF SOME METAL-INSULATOR COMPOSITES.
LDR:03028nmm a2200265 4500 001 2071050
005 20160628073005.5
008 170521s1986 ||||||||||||||||| ||eng d
035 $a (MiAaPQ)AAI8618825
035 $a AAI8618825
040 $a MiAaPQ $c MiAaPQ
100 1 $a NOH, TAE WON. $3 3186148
245 1 0 $a OPTICAL PROPERTIES OF SOME METAL-INSULATOR COMPOSITES.
300 $a 193 p.
500 $a Source: Dissertation Abstracts International, Volume: 47-05, Section: B, page: 2048.
502 $a Thesis (Ph.D.)--The Ohio State University, 1986.
520 $a Ni-MgO granular composites were prepared by coprecipitation of NiO-MgO solid solutions and their preferential reduction in a hydrogen atmosphere. Measured reflection spectra of the composites were better described by the Effective Medium Approximation (EMA) than by the Maxwell-Garnett theory (MGT). The conductivities and the dielectric constants were derived by a Kramers-Kronig transformation, and they showed a qualitative agreement with the EMA. In the far-infrared region, the percolation transition was observed in the reflection spectra, and also seen in the derived conductivities and the dielectric constants.
520 $a The far-infrared absorption of Ag-smoke--teflon composites was studied. Because of the high resistivity of the oxide layer, the far-infrared electric dipole absorption was enhanced by three or four orders of magnitude, and it became comparable to the magnetic dipole absorption. The effects of the oxide coating on the infrared and visible absorption of silver smoke were also studied using Ag-smoke--KBr composites. In the infrared and visible region, the complete Mie theory gave better descriptions of our experimental results than the MGT. Comparison of our experimental data and the Mie calculation showed that the oxide coating on the particles did not strongly affect the extinction coefficient of the Ag-smoke--KBr composite in the near-infrared and visible range.
520 $a The "anomalous" far-infrared absorption of small metal particles was investigated thoroughly using oxide-free Ag--teflon composites and Ag-smoke--teflon composites. For the oxide-free Ag particles, large enhancement of the absorption coefficient over the prediction of the MGT was observed and explained by enhancement of magnetic dipole absorption based on the increase of the eddy current paths due to clustering. For the Ag-smoke--teflon composite, excellent agreement between the experimental absorption and the MGT was obtained when the particle size distribution and oxide coating were taken into account. It was explicitly shown that the "anomalous" absorption of oxide-coated Ag particles was mainly due to clustering. Various electric dipole absorption enhancement mechanisms based on clustering of Ag smoke were also discussed.
590 $a School code: 0168.
650 4 $a Condensed matter physics. $3 3173567
690 $a 0611
710 2 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 47-05B.
790 $a 0168
791 $a Ph.D.
792 $a 1986
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8618825