CRYSTALLOGRAPHY

Change of ihe valent and structural state of iron ions upon melting of barium ferrookermanite $\mathrm{Ba}_2\mathrm{FeSi}_2\mathrm{O}_7$

A. M. Bychkov, A. A. Borisov, D. A. Khramov, A. V. Guzhova, V. S. Urusov

Institute of Geochemistry and Analytic Chemistry, Academy of Sciences of the USSR, Moscow

UDC: 548.736.6-143:539.17.013

Presented: V. L. Barsukov
Received: 12.12.1991