ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abtract AIP3O9 glass-ceramics were prepared by crystallization of glasses at 750–1100°C. Crystallization of AIP3O9 and AIPO4 at lower temperatures is favoured by addition of 5–10 mol % Li2O, Na2O or AIF3, whereas crystallization is hindered by 5–10 mol % B2O3, BPO4, SiO2, TiO2, Nb2O5 or Ta2O5. Additives such as TiO2, ZrO2, MgF2, CaF2 and Pt, frequently useful in nucleating silicate glasses, are ineffective in AIP3O9 glasses. AIPO4, resulting from the P2O5 loss during melting, forms at the surface of melted glass samples. AIP3O9 forms in the bulk as elongated columnar or lamellar crystals with grain sizes of 0.5–2.0 μm. Li2O-doped AIP3O9 is inhomogeneous with coarse intergranular regions and glassy regions. Dielectric constants vary from 5.0–5.2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01197650
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