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Thermal Expansion of Orthorhombic PbO
Author(s) -
SORRELL CHARLES A.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb15964.x
Subject(s) - orthorhombic crystal system , thermal expansion , materials science , crystallography , silicate , diffraction , thermal , mineralogy , chemistry , crystal structure , thermodynamics , composite material , optics , organic chemistry , physics
Thermal expansion of orthorhombic PbO was investigated by high‐temperature X‐ray diffraction. The coefficients in the a 0 , and c 0 directions are equal and <½ the coefficient in the b 0 direction. The structure is described in terms of Pb–O chains extended in the a 0 direction and bonded into layers in the b 0 direction; appreciable Pb–Pb bonding is indicated. Coordination and bond distances observed in PbSiO 3 and lead silicate glasses, which are similar to those of massicot, and Pb n O n polymeric units reported in PbO vapor are interpreted as additional evidence of the importance of PbO chains as structural entities.