Abstract
Thermal expansion of tetragonal PbO, investigated by high-temperature X-ray diffraction in vacuum, is nearly isotropic, with the coefficient in the c0 direction only slightly greater than that in the a0 direction. Volume thermal expansion is only slightly greater than in massicot. Retardation of the litharge-massicot transformation is tentatively interpreted as the result of very low oxygen partial pressures caused by catastrophic oxidation of the stainless-steel sample holder and resulting oxygen scavenging by lead vapor.
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