Developments in Ceramic Materials Research

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108 José M. Rojo, José L. Mesa and Teófilo Rojo the ESR spectra show isotropic signals with g= 1.97 (see Figure 5). The linewidth for the Cr2(P6O18) compound is larger than that observed for the Cr(PO3)3 phase. This result is indicative of the important role of the magnetic exchange interactions in the latter phase. Figure 5. ESR spectra of Mo(PO 3) 3, Cr(PO 3) 3 and Cr 2(P 6O 18) recorded at 4.2 K. Figure 6. ESR spectra of Al(PO 3) 3:0.1%Mo at 4.2 K. Inset shows the signal corresponding to geff. ≅ 4.
Synthesis, Spectroscopic and Magnetic Studies… 109 In order to obtain more information about the local symmetry of the M(III) centers, ESR spectra were measured on molybdenum- and chromium-doped phases of the homologous aluminium metaphosphates between 4.2 and 300 K. In the case of the Mo(III) compounds the best resolution was obtained for Al(PO3)3:0.1%Mo (Figure 6). The central g value is 1.91. Effects of the zero-field splitting of the S= 3/2 ground sate are observed but it is not possible to obtain quantitative information of the structure in the spectrum. However the signals observed between 320 and 380 mT are indicative of at least two different Mo(III) sites with D values > hν [40]. All the attempts to prepare the aluminium hexametaphosphate phase doped with chromium were unsuccessful. The obtained compounds were the metaphosphate phases. In the case of the chromium metaphosphate the ESR resolution was obtained for Al(PO3)3:2%Cr (Figure 7). Lower concentrations of chromium give rise to new signals from a no identified phase. In spite of the analogies between Cr(III) and Mo(III) ions, the spectrum for the chromium phase is different from that obtained for Al(PO3)3:0.1%Mo. The X- and Q-band spectra (Figure 7) show that the observed splittings are nearly frequency independent and this can be attributed to the zero-field splitting of the Cr(III) ion. In the X-band spectrum, the most characteristic signals are observed ca. 350, 175 mT and near zero-field. We have not carried out any simulation of ESR spectra of these multiple chromium(III) phases. Figure 7. X- and Q-band ESR spectra of Al(PO 3) 3:2%Cr, registered at 4.2 and 100 K.
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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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56 T. T. Basiev, V. A. Demidenko, K
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Page 113 and 114: Synthesis, Spectroscopic and Magnet
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The Use of Ceramic Pots in Old Wors
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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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In: Developments in Ceramic Materia
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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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242 Development of Display Technolo
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244 Li Chen technology moved to the
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246 Li Chen The continuing evolutio
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248 Li Chen the back contact cathod
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250 Li Chen Figure 3. Vertical side
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252 Li Chen Figure 6. Molybdenum mi
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254 Li Chen Figure 8(a). I-V curve
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256 Li Chen Figure 9. Life time tes
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258 Figure 11(a). Plasma generated
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260 Li Chen [13] C.A. Spindt, K.R.
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262 S. Ardizzone, C. L. Bianchi, G.
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A absorption spectra, 66, 67, 77, 7
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correlation function, 156 corrosion
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group membership, 13, 20, 21, 22, 2
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microstructure(s), x, xi, 73, 74, 2
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efraction index, 61 refractive inde
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time, vii, ix, 1, 3, 7, 8, 11, 26,
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Developments in Ceramic Materials Research

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