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Design and characterization of elect...

Cho, Yong Soo.

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Design and characterization of electroceramic interfaces for packaging and microwave frequency applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Design and characterization of electroceramic interfaces for packaging and microwave frequency applications./
作者:	Cho, Yong Soo.
面頁冊數:	281 p.
附註:	Source: Dissertation Abstracts International, Volume: 59-11, Section: B, page: 6021.
Contained By:	Dissertation Abstracts International59-11B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9913409
ISBN:	9780599118300

Design and characterization of electroceramic interfaces for packaging and microwave frequency applications.
Cho, Yong Soo.

Design and characterization of electroceramic interfaces for packaging and microwave frequency applications. - 281 p.

Source: Dissertation Abstracts International, Volume: 59-11, Section: B, page: 6021.

Thesis (Ph.D.)--Alfred University, 1997.

Two interfaces present in electronic ceramics for electronic packaging and microwave magnetic applications were investigated with regard to their influences on densification, crystallization, properties, grain growth and grain boundary characteristics. Nonstoichiometric cordierite based dielectric thick films (2.4MgO.2Al2O3 .5SiO2) containing B2O3,P2O 5 and PbO were deposited by screen-printing on various substrates such as standard 96% alumina, oxidized Cu and polycrystalline LiZn ferrite. They formed a densified glass-ceramic having alpha-cordierite phase by firing at 800°C to 950°C regardless of the type of substrate. A heterogeneous nucleation mechanism originating from impurities at the film interface was found to be predominant in the case of deposition on the alumina substrate. Penetration of remaining glass of the thick film into the alumina substrate was observed to occur through the film interface. Cu diffused from the oxidized Cu layer into the thick film during firing, and formed Cu-rich precipitates on the film surface and the film interior. An interaction product based on a beta-spodumene phase was observed near the interface region in the case of cordierite thick film when deposited on a polycrystalline LiZn ferrite substrate. This can be attributed to Li diffusion from the LiZn ferrite. A glassy grain boundary phase added intentionally to the LiZn ferrite substrate tended to prevent the formation of alpha-cordierite phase. Additionally, kinetic analyses utilizing XRD, DTA or dilatometer were conducted to quantitatively investigate the effects of several additives such as Bi2O 3,MgO, PbO and Cu2O on densification and crystallization.

ISBN: 9780599118300Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Design and characterization of electroceramic interfaces for packaging and microwave frequency applications.
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245 1 0 $a Design and characterization of electroceramic interfaces for packaging and microwave frequency applications.
300 $a 281 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-11, Section: B, page: 6021.
502 $a Thesis (Ph.D.)--Alfred University, 1997.
520 $a Two interfaces present in electronic ceramics for electronic packaging and microwave magnetic applications were investigated with regard to their influences on densification, crystallization, properties, grain growth and grain boundary characteristics. Nonstoichiometric cordierite based dielectric thick films (2.4MgO.2Al2O3 .5SiO2) containing B2O3,P2O 5 and PbO were deposited by screen-printing on various substrates such as standard 96% alumina, oxidized Cu and polycrystalline LiZn ferrite. They formed a densified glass-ceramic having alpha-cordierite phase by firing at 800°C to 950°C regardless of the type of substrate. A heterogeneous nucleation mechanism originating from impurities at the film interface was found to be predominant in the case of deposition on the alumina substrate. Penetration of remaining glass of the thick film into the alumina substrate was observed to occur through the film interface. Cu diffused from the oxidized Cu layer into the thick film during firing, and formed Cu-rich precipitates on the film surface and the film interior. An interaction product based on a beta-spodumene phase was observed near the interface region in the case of cordierite thick film when deposited on a polycrystalline LiZn ferrite substrate. This can be attributed to Li diffusion from the LiZn ferrite. A glassy grain boundary phase added intentionally to the LiZn ferrite substrate tended to prevent the formation of alpha-cordierite phase. Additionally, kinetic analyses utilizing XRD, DTA or dilatometer were conducted to quantitatively investigate the effects of several additives such as Bi2O 3,MgO, PbO and Cu2O on densification and crystallization.
520 $a The same additives, Si and Mn were incorporated by the sol-gel coating process into two different microwave magnetic materials, yttrium iron garnet and LiZn ferrite. The particulate coating method using sol-gel reactions was proven to induce a uniform microstructure, especially in the case of yttrium iron garnet. The additives acted as an inhibitor for grain growth in the case of the yttrium iron garnet by forming Si-rich segregates along the grain boundaries. The segregates were believed to exert a drag force against the movement of grain boundaries. The same additives accelerated grain growth of the LiZn ferrite by forming a Si-rich glassy phase along the grain boundaries. Activation energies and grain boundary mobilities calculated for the two magnetic ceramics having the additives supported the observed microstructures. The additives as well as microstructural characteristics were believed to contribute to the enhanced magnetic properties. For example, the addition of Si and Mn were responsible for the increased spin wave line width in the case of yttrium iron garnet mainly due to the formation of dense material with uniform small grains and no pores.
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