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000010152 020__ $$a978-3-89336-610-1
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000010152 041__ $$aGerman
000010152 082__ $$a333.7
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000010152 1001_ $$0P:(DE-Juel1)VDB91387$$aKarim, Kamran Said$$b0$$eCorresponding author$$gmale$$uFZJ
000010152 245__ $$aHerstellung polykristalliner Szintillatoren für die Positronen-Emissions-Tomographie (PET)
000010152 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2010
000010152 300__ $$aVI, 154 S.
000010152 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis
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000010152 4900_ $$0PERI:(DE-600)2445288-9$$aSchriften des Forschungszentrums Jülich : Energie & Umwelt / Energy & Environment$$v55$$x1866-1793
000010152 502__ $$aUniv. Bochum, Diss., 2010$$bDr. (Univ.)$$cUniv. Bochum$$d2010
000010152 500__ $$aRecord converted from VDB: 12.11.2012
000010152 520__ $$aTransparent ceramics are becoming more and more important for two new types of
applications. On the one hand in cases where high mechanical and thermal demands in combination with optical properties are required, on the other hand where the optical properties of transparent materials like glass are not sufficient e.g. in positronemission-tomography (PET) diagnostics. Most state of the art PET-scanners are using high-priced single crystals as scintillator material. The technological challenge is to replace single crystal by cost-efficient transparent ceramics. Producing transparent ceramics is ordered in synthesis of the powders and in manufacturing of these into transparent ceramics.
The aim of this work was to synthesize single phase yttrium-alumina-and Luthetiumalumina- garnet (YAG, LuAG) powders partially doped with neodymium or
praseodymium by four different synthesis routes (Pechini-synthesis, sol-gel-route, coprecipitation and solid state reactions). Additionally industrial LuAG and LuPO4
powders were characterized and manufactured. The powders were processed as submicron- and nanopowders. 

Newly produced single-phase powders were homgenized with additions of sintering
additives like tetraethyl orthosilicate (TEOS) and binders like polyvinyl alcohol (PVA).
Moulding the powders were carried out by unaxial pressing, cold isostatic pressing
and in individual cases also by slip casting. The achieved green densities were in a range of 25-42 %. Examination of calcination behaviour leads to a calcination
temperature of 1000 °C with 2 hours dwell time in air atmosphere.
Only solid state reactions resulted into transparent YAG, YAG:Pr, LuAG, LuAG:Pr
ceramics. Solid state reactions of nanopowders resulted in heterogeneously
transparent samples. Ceramics made by powders of other synthetic routes gave nontransparent ceramics due to porosity and additional phases. Transmission measurements of the manufactured transparent ceramics showed in classical one step sintering and two step sintering program significant lower transmission than respectitive single crystals but similar transmission compared to ceramics reported in literature.
000010152 536__ $$0G:(DE-Juel1)FUEK402$$2G:(DE-HGF)$$aRationelle Energieumwandlung$$cP12$$x0
000010152 655_7 $$aHochschulschrift$$xDissertation (Univ.)
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000010152 9131_ $$0G:(DE-Juel1)FUEK402$$bEnergie$$kP12$$lRationelle Energieumwandlung$$vRationelle Energieumwandlung$$x0
000010152 9201_ $$0I:(DE-Juel1)VDB809$$d30.09.2010$$gIEF$$kIEF-1$$lWerkstoffsynthese und Herstellungsverfahren$$x0
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