Zum System Na2O?TiO2?H2O

Wefers, K.

doi:10.1007/bf00608065

Cited by 9 publications

(17 citation statements)

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“…The process of dehydration of gibbsite (aluminium hydroxide, γ‐Al(OH) 3 ) was studied extensively and is a very complicated process as reported in numerous research publications [1–17]. The dehydration sequence of γ‐Al(OH) 3 and the formation of α‐Al 2 O 3 is accomplished through various metastable processes (transition alumina).…”

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Thermal decomposition of precipitated fine aluminium trihydroxide

Bhattacharya

Das

Mukherjee

et al. 2004

Scand Jof Metallurgy

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Fine (1.5 μm) aluminium trihydroxide (ATH), prepared from Bayer liquor, was subjected to dehydration at various temperatures up to 1400°C. The fine ATH was found to be gibbsitic in nature. XRD data indicated the formation of various transitional phases before becoming a stable α‐Al2O3 phase. Boehmite phase formation, that is unlikely at such a fine particle level, started at around 250°C and completed its transformation at 400°C. Formation of boehmite phase was also observed with 0.25 and 1 μm sized particles. Beyond 400°C, various transitional phases were formed. At 500°C, chi‐alumina formation was found; kappa‐alumina phase transformation started at 900°C and completed at 1000°C. Coarser particles (∼100 μm) also followed the similar trend. In the case of coarse ATH, α‐Al2O3 transformation was found at around 1200°C, whereas for fine particles, α‐Al2O3 transformation temperature was found to be 1400°C. FTIR spectra showed the presence of molecular water and Al–O bonds in gibbsitic material. Characteristic vibrations at 3098, 2099 and 1070 cm−1 were found for boehmite particles at 400°C. Lattice parameters and hkl values were calculated and reported. Determination of crystallite size, cell volume, number of atoms/unit cell and number of unit cell/crystallite were also undertaken and reported.

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“…Conversion of trihydroxide to boehmite is accomplished at around 500°K [15] under rapid heating conditions with coarse particle size. Beyond this temperature, a series of metastable phases such as chi, kappa aluminas are formed [1, 2, 10–14, 16]. Other forms of transition aluminas obtained are gamma, delta, theta, eta, rho etc.…”

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Thermal decomposition of precipitated fine aluminium trihydroxide

Bhattacharya

Das

Mukherjee

et al. 2004

Scand Jof Metallurgy

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“…drda, HoleČek, Vybíral. 15 ŠmaHel, Hussitische Revolution; HilscH, Hus; Štěpán, Jošt; aNNas, Hoftag; studt, Martin V.; rei-sant, überzeugende Forschungsergebnisse zu Sigismund, und dasselbe kann auch von der Aufsatzliteratur gesagt werden 16 .…”

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“…Eine Vollständigkeit bei der Nennung relevanter Titel wurde nicht angestrebt. 16 Zahlreiche Titel sind im Literaturverzeichnis dieses Bandes angegeben. 17 Über die Arbeiten in diesem FWF-Projekt 17519-G08 und im Anschlussprojekt 21198-G18 informieren die im DA veröffentlichten Jahresberichte über Stand und Fortführung der Regesta Imperii.…”

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“…Der Kreis um die unnachgiebigen radikalen Hussiten begann sich zu schließen. Während Pilsen von den Hussiten belagert wurde, gedieh die Aktivität der Politiker der Landesgemeinde auf dem Prager Landtag am Tag des Heiligen Martins 1433 zum Abschluss 16 . Auf diesem Landtag wurden die Tätigkeit der böhmischen Delegation auf dem Basler Konzil und die erste Fassung der Basler Kompaktaten angenommen 17 .…”

Section: Aspekte Des Politischen Handelns Und Der Herrschaftspraxis Sigismundsunclassified

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