ChemInform Abstract: Silica-Free Mullite Structures in the Al2O3-B2O3-P2 O5 Ternary System

2001 equilibria E 4000

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equilibria

Silica-Free Mullite Structures in the Al2 O3 –B2 O3 –P2 O5 Ternary System. — Stability and homogeneity range of mullite structures in the title system are studied in the range 900–1000 ◦ C. Silica-free mullite structures Al8+x P1−x B1+x O16+x/2 (0 ≤ x ≤ 0.6) are prepared from Al(NO3 )3 ·9H2 O, H3 BO3 , and NH4 H2 PO4 using glycerol as reducing agent. The resulting xerogels are heated at 850–1000 ◦ C for 1 h in air. The samples are characterized by neutron diffraction and XRD. T* sites are occupied by Al atoms while P and Si are located on T sites. B occupies a threefold position, not present in pure Si–Al–O mullite. — (MAZZA, D.; RONCHETTI, S.; DELMASTRO, A.; TRIBAUDINO, M.; KOCKELMANN, W.; Chem. Mater. 13 (2001) 1, 103-108; Dip. Sci. Mater. Ing. Chim., Politec. Torino, I-10129 Torino, Italy; EN)

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