Developments in Ceramic Materials Research

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In: Developments in Ceramic Materials Research ISBN 978-1-60021-770-8 Editor: Dena Rosslere, pp. 261-279 © 2007 Nova Science Publishers, Inc. Chapter 9 COLOURED ZrSiO4 CERAMIC PIGMENTS S. Ardizzone 1 , C. L. Bianchi 1 , G. Cappelletti 1 , P. Fermo 2 and F. Scimè 1 1 Department of Physical Chemistry and Electrochemistry, University of Milan, Via Golgi 19, 20133 Milan, Italy 2 Department of Inorganic, Metallorganic and Analytical Chemistry, University of Milan, Via Venezian 21, 20133 Milan, Italy ABSTRACT A sol-gel reaction starting from Si and Zr alkoxides, in water-ethanol mixtures, was employed to obtain praseodymium, vanadium and iron doped zirconium silicate powders (zircon). The reactions were performed by modulating both: a) the amount of metal salt in the starting mixture (Me/Zr molar ratio in the range 0.05-0.1) and b) the temperature of firing (600-1200°C). In the case of V-doped pigments, samples were synthesized also in the presence of a constant amount (0.26 salt/Zr molar ratio) of mineralizers (LiF, LiCl, NaF, NaCl, KF, KCl). The samples were characterised by X-ray diffraction, SEM micrographs, specific surface area determinations and UV-Vis diffuse reflectance spectroscopy. XPS analyses were performed on V-doped zircon pigments by studying in particular the Zr 3d, Si 2p and V 2p regions. The colour of the pigments was characterized on the grounds of the CIE (Commission Internationale de l’Eclairage) standard procedure (CIE L*a*b* measurements). Results from the structural, morphological and optical characterisations are examined and cross-compared to produce a consistent picture of the key factors leading to the formation, growth and optical properties of the reaction products. Keywords: ceramic materials, metal doped-zircon pigments, mineralizers, sol-gel processes, optical properties, X-ray methods, XPS.
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DEVELOPMENTS IN CERAMIC MATERIALS R
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PREFACE Ceramics are refractory, in
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Preface ix crystals is discussed. A
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Preface xi spectra and the directio
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2 Leslie G. Cecil comprehensive dat
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4 Leslie G. Cecil Ringle et al. (19
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6 Leslie G. Cecil The main architec
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8 Leslie G. Cecil can study “the
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10 Leslie G. Cecil Middleton et al.
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12 Leslie G. Cecil The laser ablate
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14 Leslie G. Cecil There are two ge
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16 Leslie G. Cecil distinct recipes
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18 Leslie G. Cecil second group (Fi
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20 Leslie G. Cecil The Vitzil-Orang
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22 Leslie G. Cecil Table 3. Mahalan
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24 Leslie G. Cecil Ixlú and Ch’i
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26 Leslie G. Cecil structures (D. R
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28 Leslie G. Cecil paste and Macanc
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36 Z. C. Li, Z. J. Pei and C. Tread
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62 I, % 100 80 60 40 20 0 T. T. Bas
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68 Fluorescence, a.u. 1 T. T. Basie
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78 k, cm -1 20 18 16 14 12 10 8 6 4
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82 Photon counts 300 250 200 150 10
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88 Fluorescence, a.u. I transfer ,
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In: Developments in Ceramic Materia
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Synthesis, Spectroscopic and Magnet
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a c Synthesis, Spectroscopic and Ma
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Transmission Transmission Transmiss
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Sm (J/Kmol) Sm (J/Kmol) 15 10 5 Syn
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IACC ( τ ) = t2 ∫ The Use of Cer
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D50 0.8 0.7 0.6 0.5 0.4 0.3 The Use
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Definition (D50) 1 0.95 0.9 0.85 0.
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Modeling of Thermal Transport in Ce
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q x = Modeling of Thermal Transport
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Page 276 and 277: 262 S. Ardizzone, C. L. Bianchi, G.
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Developments in Ceramic Materials Research

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