JST Vol. 21 (1) Jan. 2013 - Pertanika Journal - Universiti Putra ...

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Wong Y. C. and Tan Y. P. a b c d Fig.5: The SEM image for (a) Bi 4Cr 2O 12, (b) Bi 5Cr 2O 13.5, (c) Bi 6Cr 2O 15, and (d) Bi 7Cr 2O 16.5, sintered at 600 o C Fig.6: The FT-IR spectra of (a) Bi 4Cr 2O 12, (b) Bi 5Cr 2O 13.5, (c) Bi 6Cr 2O 15, and (d) Bi 7Cr 2O 16.5 102 Pertanika J. Sci. & Technol. 21 (1): 283 - 298 (2013)
Physico-Chemical and Electrical Properties of Bismuth Chromate Solid Solutions Arbritary weight ( percentage ) (d) (c) (b) (a) Fig.7: DTA thermogram of Bi 6Cr 2O 15 100 200 300 400 500 600 700 800 Temperature ( o C ) However, no shift was observed in the wavenumbers of Cr-O-Cr bond vibration, as well as Cr-O stretching with the variation of the Cr content. The band of ~ 587 cm -1 and ~ 467 cm -1 in the IR spectra was attributed to the vibration of Bi-O and Bi-O-Bi vibrations of [BiO 6] octahedral units, respectively (Cheng et al., 2006; Rico-Fuentes et al., 2005). The atomic weight of Bi is about four times larger than that of Cr. Moreover, the ionic radius of Bi 3+ (1.20 Å) is larger than that of Cr 3+ (0.69 Å). Thus, Bi-O bond length is expected to be longer and weaker compared to Cr-O bond. This may lead to the lowering of wavenumber (υ) at 587 cm -1 and 467 cm -1 . The Bi contents for the compounds Bi xCr 2O δ, 4 ≤ x ≤ 7 are different and it is expected that υ would decrease with increasing Bi content. However, from the IR spectra obtained, the υ does not decrease with the increasing Bi content. It may due to Bi-O Pertanika J. Sci. & Technol. 21 (1): 283 - 298 (2013) 1.02 % 0.89 % 0.96 % 0.77 % Fig.8: The TGA thermographs of (a) Bi 4Cr 2O 12, (b) Bi 5Cr 2O 13.5, (c) Bi 6Cr 2O 15, and (d) Bi 7Cr 2O 16.5 with their respective percentage weight loss 103
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Journal of Science & Technology Jou
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International Advisory Board Adarsh
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ut bovine milk allergy by far is th
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Selected Articles from UPM-Malaysia
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ISSN: 0128-7680 © 2013 Universiti
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Aspect of Fatigue Analysis of Compo
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Application of Anthropometric Dimen
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Different Media Formulation on Bioc
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Heng, S. C., Ibrahim, Z. B., Suleim
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CONCLUSION Heng, S. C., Ibrahim, Z.
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Y. Yusuf, J. M. Juoi, Z. M. Rosli,
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Page 62 and 63: Surface Roughness Y. Yusuf, J. M. J
Page 64 and 65: DISCUSSION Y. Yusuf, J. M. Juoi, Z.
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N. Maizatul, I. Norazowa, W. M. Z.
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REFERENCES N. Maizatul, I. Norazowa
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CBIR Using Colour and Shape Fused F
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Toward Automatic Semantic Annotatin
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Issues on Trust Management in Wirel
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Trust Value MF-ID 1 0.8 0.6 0.4 0.2
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A Negation Query Engine for Complex
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REFERENCES A Negation Query Engine
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The Problem Association Rule Mining
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Association Rule Mining threshold t
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Association Rule Mining must be sor
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Association Rule Mining On the othe
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Association Rule Mining Quinlan, J.
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Che Mustapha Yusuf, J., Mohd Su’u
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Az Azrinudin Alidin and Fabio Crest
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Yogan Jaya Kumar, Naomie Salim, Ahm
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REFERENCES Yogan Jaya Kumar, Naomie
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Hasiah Mohamed@Omar, Azizah Jaafar
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The Role of Similarity Measurement
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TABLE 5: Winners MRS The Role of Si
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REFEREES FOR THE PERTANIKA JOURNAL
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Guidelines for Authors Publication
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table should be prepared on a separ
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The Journal’s review process What
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Usability of Educational Computer G
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