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- W2007114089 abstract "Abstract The thermal stability of porous transition alumina at high temperature is a crucial challenge for several applications. To delay the θ to α-alumina transition temperature (1180°C), the synthesis by sol–gel method and the introduction of doping element as nitrate salt M(NO 3 ) x (M=Ba, Mg, Pr, La and Ce) have been investigated. Over three preparation procedures, the introduction of the doping element through the sol–gel process gave the higher BET surface area. Additional thermal analysis and powder X-ray diffraction studies have shown that only a few amount (1 mol percent) of doping element is sufficient to increase the θ→α-Al 2 O 3 phase transition temperature up to 1315°C. The most promising samples are (Al 2 O 3 ) 0.98 Ba 0.02 and (Al 2 O 3 ) 0.99 Pr 0.01 . Even after 5 h at 1200°C, they maintain a rather good specific area (32 m 2 /g) in relation with the incomplete and very slow transformation of θ into α-alumina." @default.
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- W2007114089 date "2001-01-01" @default.
- W2007114089 modified "2023-09-25" @default.
- W2007114089 title "Effect of doping elements on the thermal stability of transition alumina" @default.
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- W2007114089 doi "https://doi.org/10.1016/s1466-6049(00)00088-x" @default.
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