Chemical synthesis and densification of cesium aluminosilicate powders

Persistent Link:
http://hdl.handle.net/10150/277275
Title:
Chemical synthesis and densification of cesium aluminosilicate powders
Author:
Hogan, Mari, 1965-
Issue Date:
1990
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Pollucite (CsAlSi₂O₆) is a refractory phase within the Cs₂O-Al₂O₃-SiO₂. It melts at >1900°C and also has a reported thermal expansion value of 15 x 10⁻⁷/°C. These qualities make it suitable for study as a high temperature structural ceramic. Amorphous powders were synthesized by a novel sol-gel process in the Cs₂O-Al₂O₃-SiO₂ system. Gels were produced from tetraethoxysilane (TEOS), Aluminum chelate, and Cs-acetate. Powders were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), chemical, differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The glass transition and crystallization temperatures were determined to be 945°C and 1026°C, respectively, for the amorphous powders. Pollucite and mullite phases were observed by XRD of bulk glass-ceramics. A density of 3.02 gm/cm³ was observed for the hot pressed material. Dielectric constants in the frequency range 1kHz-1MHz were found to be in the range of 5.23 to 5.78 for the as hot pressed and heat treated samples. Thermal expansion coefficients were also determined.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Engineering, Materials Science.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Risbud, Subhash H.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleChemical synthesis and densification of cesium aluminosilicate powdersen_US
dc.creatorHogan, Mari, 1965-en_US
dc.contributor.authorHogan, Mari, 1965-en_US
dc.date.issued1990en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractPollucite (CsAlSi₂O₆) is a refractory phase within the Cs₂O-Al₂O₃-SiO₂. It melts at >1900°C and also has a reported thermal expansion value of 15 x 10⁻⁷/°C. These qualities make it suitable for study as a high temperature structural ceramic. Amorphous powders were synthesized by a novel sol-gel process in the Cs₂O-Al₂O₃-SiO₂ system. Gels were produced from tetraethoxysilane (TEOS), Aluminum chelate, and Cs-acetate. Powders were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), chemical, differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The glass transition and crystallization temperatures were determined to be 945°C and 1026°C, respectively, for the amorphous powders. Pollucite and mullite phases were observed by XRD of bulk glass-ceramics. A density of 3.02 gm/cm³ was observed for the hot pressed material. Dielectric constants in the frequency range 1kHz-1MHz were found to be in the range of 5.23 to 5.78 for the as hot pressed and heat treated samples. Thermal expansion coefficients were also determined.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectEngineering, Materials Science.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorRisbud, Subhash H.en_US
dc.identifier.proquest1339912en_US
dc.identifier.bibrecord.b26233575en_US
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