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  • 1985-1989  (8)
  • Analytical Chemistry and Spectroscopy  (8)
  • Chronic schizophrenia
  • 1
    Digitale Medien
    Digitale Medien
    Structural studies on heat-treated pyrophyllite mineral by scanning electron microscopy (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 17 (1988), S. 181-185 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Pyrophyllite was heat treated up to 1000°C in the presence of fluxes such as Li2CO3, Na2CO3, K2CO3 and CaCO3 and the products were examined by scanning electron microscopy (SEM). It is shown that the surface morphology of the mineral varies with both temperature and flux. The dehydroxylation reaction in the mineral commences at 500°C and continues above 900°C. Dehydroxylated phases are observed even at 950-1000°C. The formation of free Al2O3, cristobalite, mullite and other phases from pyrophyllite was detected by the SEM examination.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300170505
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  • 2
    Digitale Medien
    Digitale Medien
    SEM studies on silica from plant materials (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 16 (1987), S. 57-60 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The Silica structural framework in plant materials can be separated from the organic part by acid leaching and can be examined by SEM. Scanning electron micrographs characterizing the bonding and distribution patterns of silica in rice husk, rice straw and sugarcane leaves are presented. The differences in the surface morphology of the three plant products are discussed.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300160204
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    X-ray photoelectron spectroscopic studies on silicon carbide from rice husk (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 215-218 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The surface structure of silicon carbide whiskers, produced from rice husk at 1500-1800°C, was examined by x-ray photoelectron spectroscopy. An ESCA survey scan of the surface showed Si, C, O and F to be present; Si in the form of SiCx and SiOx and C in the form of SiCx and CHx. On sputtering the sample, the SiOx and CHx species were reduced and the SiCx level increased. The photoelectron spectra are presented.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300180507
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  • 4
    Digitale Medien
    Digitale Medien
    EDXRF and XRD studies on alumina fibre using natural fibre as substrate (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 219-224 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The structural characterization of alumina fibres obtained from an aluminium salt and three natural fibres (jute, sisal and coir) was examined by EDXRF and XRD. Elemental composition spectra from EDXRF of fibres pyrolysed at 1200 and 1400°C are presented and the results are compared with those obtained by wet chemical analysis and atomic absorption spectrometry. XRD diffractograms of the same samples are also shown. The evolution of the α phase of alumina with increase in pyrolysis temperature was examined. Scanning electron micrographs of alumina fibre with jute fibre are also presented.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300180508
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  • 5
    Digitale Medien
    Digitale Medien
    Scanning electron microscopic studies of heat-treated Rice Husk (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 267-269 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Rice husk was heat treated up to 1300°C and the products were examined by scanning electron microscopy. The fibrous structure of the initial rice husk persisted throughout. Cristobalite and tridymite were detected in the product at 1250°C by x-ray diffraction. The fibrous structures were characterized and shown to have a bearing on the formation of SiC whiskers as substrates.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300180606
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  • 6
    Digitale Medien
    Digitale Medien
    Scanning electron microscopic studies of pore formation in mica schist insulating brick (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 15-18 
    Details
    ISSN: 0049-8246
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: SEM micrographs showing porous structures and bonding of pores through broken mica flakes are presented. Pores of varying dimensions (10-400 μm) are formed. Interlayer spaces in mica are shown to be the preferential direction for heat and subsequently crack propagation during heat treatment for producing cellular insulating bricks at 900°C. The cracks end up with the formation of large pores in the presence of foaming agent and sodium silicate.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/xrs.1300180105
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  • 7
    Digitale Medien
    Digitale Medien
    Phase transition in manganese and zinc fluorotitanate hexahydrate and hexadeuterate systems observed by Raman spectroscopy (1985)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 16 (1985), S. 149-155 
    Details
    ISSN: 0377-0486
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Raman spectra of MnTiF6·6H2O, MnTiF6·6D2O, ZnTiF6·6H2O and ZnTiF6·6D2O single crystals were studied in different polarizations between 300 and 77 K and the observed bands were assigned to the various modes of vibrations of these systems. Phase transition in these systems was observed by studying the intensity of νs(TiF6) mode and νs(H2O/D2O) mode with temperature. The mechanism of the phase transition is discussed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jrs.1250160304
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  • 8
    Digitale Medien
    Digitale Medien
    Raman studies of phase transitions in Mg(ClO4)2·6H2O crystal (1985)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 16 (1985), S. 303-307 
    Details
    ISSN: 0377-0486
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Raman spectra of Mg(ClO4)2·6H2O single crystal in different polarizations in the temperature range 350-110 K are presented. Three phase transitions were found at 325, 272 and 225 K. The transition at 272 K is associated with the rotation of crystallographic a and b axes with respect to the space-fixed coordinate axes X and Y in the ab plane. The transition at 325 K occurs as a result of reorientation of the ClO4- ion and that at 225 K as a result of the tumbling motion of the aquo complex.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jrs.1250160503
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