Developments in Ceramic Materials Research

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272 S. Ardizzone, C. L. Bianchi, G. Cappelletti et al. In the case of the Na salts, and also in the absence of mineralizers, the zircon phase starts to form only at 800°C, while for K salts the formation of zircon is significant only at 1000°C. It is interesting to observe that the sample which shows the most intense blue colour (see in the following Figs. 10 and 11) is the sample obtained with NaF and calcined at 800°C, although the amount of zircon phase, for this sample, is lower than for the sample obtained at the same temperature in the presence of LiF. From the trend in Figs.7 and 8 the sequence of promotion of the zircon lattice follows for the cations Li>Na>K; the cation promotion trend follows the reverse trend of their crystallographic radii, Li
Coloured ZrSiO4 Ceramic Pigments 273 XPS Analyses The first aspect which can be considered in commenting XPS results is the change in XPS spectra of the V 2p3/2 region, depending on the final colour of the pigment. The green or yellow powders show the presence of two V components (Figure 9a), while the blue samples show a single component (Figure 9b). The components can be attributed to: i) 517.2 eV V 5+ , ii) 516.5 eV V 4+ and iii) 515.6 eV V 3+ . A further aspect concerns the trend of the V/Zr atomic ratios reported in Table 1. In the case of samples obtained in the absence of mineralizers the observed V/Zr ratio is 0.2 and 0.3 at 800 and 1000°C respectively; these values, when compared with the V/Zr ratio of 0.1 adopted in the synthesis, indicate the occurrence of a certain degree of surface segregation of V with respect to the bulk. Also in the presence of Li salts the V/Zr ratio is around 0.2-0.3 and goes up to 0.6 in the case of LiF at 1000°C. In the case, instead, of the addition of the other mineralizers, the V/Zr ratio drops to values around 0.1 matching the stoichiometric value. These observations suggest that the addition of the mineralizers, all except Li salts, promote the incorporation of the V ion into the zircon lattice. In the case instead of Li salts, Li and V compete for the same positions in the lattice due to the close proximity of their sizes. Li salts therefore, on one side promote the formation of the zircon lattice but, on the other side, “throw out” V from the lattice positions thus making the colour of the pigment less intense. The Si/Zr atomic ratios range for all the samples around the stoichiometric value of 1.0 except for samples V0.1800 and V0.1NaCl.800 in which the fraction of zircon is not very high and apparently ZrO2 is segregated at the surface. Figure 9. XPS V 2p 3/2 region of a) V 0.10 and b) V 0.10NaF calcined at 800°C.
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DEVELOPMENTS IN CERAMIC MATERIALS R
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Copyright © 2007 by Nova Science P
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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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30 Leslie G. Cecil Bieber, A. M. Jr
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32 Leslie G. Cecil Kepecs, S. M., a
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34 Leslie G. Cecil Schele, L., Grub
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36 Z. C. Li, Z. J. Pei and C. Tread
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54 T. T. Basiev, V. A. Demidenko, K
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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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70 Fluorescence, a.u. 1 0.1 0.01 0.
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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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84 Fluorescence, a.u. I transfer ,
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86 ln(I transfer (t)) -4.2 -4.4 -4.
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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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Intensity (a.u.) Intensity (a.u.) 8
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The Use of Ceramic Pots in Old Wors
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3.2. Wall-in Positions The Use of C
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IACC ( τ ) = t2 ∫ The Use of Cer
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where σ res is the scattering cros
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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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212 R. Ramesh, H. Kara, Ron Stevens
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220 ε S 33 R. Ramesh, H. Kara, Ron
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Page 256 and 257: 242 Development of Display Technolo
Page 258 and 259: 244 Li Chen technology moved to the
Page 260 and 261: 246 Li Chen The continuing evolutio
Page 262 and 263: 248 Li Chen the back contact cathod
Page 264 and 265: 250 Li Chen Figure 3. Vertical side
Page 266 and 267: 252 Li Chen Figure 6. Molybdenum mi
Page 268 and 269: 254 Li Chen Figure 8(a). I-V curve
Page 270 and 271: 256 Li Chen Figure 9. Life time tes
Page 272 and 273: 258 Figure 11(a). Plasma generated
Page 274 and 275: 260 Li Chen [13] C.A. Spindt, K.R.
Page 276 and 277: 262 S. Ardizzone, C. L. Bianchi, G.
Page 295 and 296: A absorption spectra, 66, 67, 77, 7
Page 297 and 298: correlation function, 156 corrosion
Page 299 and 300: group membership, 13, 20, 21, 22, 2
Page 301 and 302: microstructure(s), x, xi, 73, 74, 2
Page 303 and 304: efraction index, 61 refractive inde
Page 305 and 306: time, vii, ix, 1, 3, 7, 8, 11, 26,
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Developments in Ceramic Materials Research

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