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Synthetic Studies of Phosphate Based Ceramic Materials

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dc.contributor.advisor Khalifah, Peter G en_US
dc.contributor.advisor Hsiao, Benjamin S en_US
dc.contributor.author Zhao, Yiran en_US
dc.contributor.other Department of Chemistry en_US
dc.date.accessioned 2017-09-20T16:51:50Z
dc.date.available 2017-09-20T16:51:50Z
dc.date.issued 2017-05-01 en_US
dc.identifier.uri http://hdl.handle.net/11401/77068 en_US
dc.description 41 pg. en_US
dc.description.abstract Phosphate based ceramics are widely used in the field of energy materials, where they have been used both as solid state ionic conductors and as electrode materials. Two kinds of phosphate based ceramics: NASICONs (Na Super Ion Conductors) and alpha-cristobalite form AlPO4 were synthesized and analyzed in this work. Phosphate based NASICONs materials, which have the general formula: A3 xM2(PO4)3, represent the first known family of Na superionic conductors, and for this reason, have found use as solid state electrolytes. More recently, lithium-substituted NASICON-structured materials have been identified as candidate electrolytes for solid state lithium ion batteries. Various approaches for the synthesis of NASICON-type compounds Li1.5Al0.5Ti1.5(PO4)3 and Na1.5Al0.5Ti1.5(PO4)3 were pursued in this work. A variety of experimental conditions (different reaction containers, different reaction atmospheres, different reaction precursors, etc.) were tried to overcome limitations of the high reactivity of samples with crucibles during synthesis procedures. X-ray diffraction techniques were used to identify and quantify product and impurity phases. A second phosphate based ceramic material investigated in the course of this work is AlPO4 with the alpha-cristobalite structure. It is known that SiO2 with the alpha-cristobalite structure is a rare example of a ceramic with a negative Poisson’s ratio. Polycrystalline alpha-cristobalite AlPO4 was synthesized to investigate whether this predicted behavior can indeed be observed. Although the many phase transitions between different polymorphs of AlPO4 complicate the synthesis of the desired alpha-cristobalite form, good methods for preparing dense pellets of this phase were developed. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Chemistry en_US
dc.title Synthetic Studies of Phosphate Based Ceramic Materials en_US
dc.type Thesis en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Marschilok, Amy C. en_US

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