Developments in Ceramic Materials Research

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128 José M. Rojo, José L. Mesa and Teófilo Rojo μB at 1,8 K) obtained from the magnetic data. This can be attributed to the low ordering temperature (TN= 2.2 K) observed in this compound. Figure 24. Refinement of the Cr 2(P 6O 18) neutron diffraction profiles at 1.8 K (the intensity is in arbitrary units. The position of Bragg reflections for the crystallographic (first row) and magnetic (second row) structures are presented. The difference curve is plotted at the botton of the figure. c a b Figure 25. Projection of the magnetic structure of Cr 2(P 6O 18) onto the a axis. The directions of the electronic spins and the fundamental unit cells are shown.
Synthesis, Spectroscopic and Magnetic Studies… 129 The magnetic structure of the Cr2(P6O18) phase is shown in Figure 25 where only the (CrO6) octahedron and magnetic moments are represented for clarity. The model implies antiferromagnetic arrangements between the magnetic moments stabilising and overall threedimensional (3D) antiferromagnetic order. The refined moments are aligned in the (100) plane pointing 45.3° from the z axis (seee Figure 25). This value induces the weak ferromagnetism detected in the magnetic measurements at low applied fields. 7.2. M(PO3)3 (M= Mo, Fe) Metaphosphates The neutron diffraction patterns at 2 K for M(PO3)3 (M= Mo, Fe) were collected in the D2B powder diffractometer and are represented in Figure 26. The patterns exhibit extra magnetic peaks indicating than both compounds are magnetically ordered at 2 K. The magnetic reflections for the molybdenum metaphosphate exhibit small intensities due to the low ordering magnetic temperature observed in this compound. The thermal evolution of the neutron diffraction patterns for Fe(PO3)3 was followed in the D1B instrument from 1.5 to 20 K. M=Fe M=Mo 2K * * RT * * 2K * RT Figure 26. Comparison of D2B neutron diagrams of (a) Mo(PO 3) 3 (λ= 1.594 Å) and (b) Fe(PO 3) 3 (λ = 2.41 Å), at room temperature and 2 K. The diagrams are shown as a function of the inverse of the d spacing due to the different wavelengths used in the measurements. Magnetic ontribution an also marked.
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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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Page 113 and 114: Synthesis, Spectroscopic and Magnet
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Page 119 and 120: Transmission Transmission Transmiss
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Page 179 and 180: D50 0.8 0.7 0.6 0.5 0.4 0.3 The Use
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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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