Résumé du preprint DAPNIA/SED/01-01

Crystal structure of lead tungstate at 1.4 and 300 K
R. Chipaux, G. André, A. Cousson
The crystal structure of lead tungstate, PbWO4, 
is tetragonal, scheelite type, space group I41/a. 
This compound is frequently subjected to lead 
deficiency, due to the difference in the vapour 
pressure of the two oxides, WO3 and PbO, used in 
the crystal growth. One group has reported that 
lead vacancies can order in a crystal structure 
derived from the scheelite type, but of lower 
symmetry and described by the space group P4/nnc 
or P-4.

We report here on neutron diffraction measurements 
performed on three different powdered samples. 
Our measurements do not show any indication of 
structural transition between 1.4 and 300 K. The 
structure is undoubtedly the tetragonal one. The 
existence of a lead deficient structure remains 


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