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The single crystal structure of the high temperature phase,  δ -Y 2 Si 2 O 7 , has been established by X-ray diffraction. Crystal data: Y 2 Si 2 O 7 , M = 346.0; orthorhombic,  Pnam ,  a  = 13.655(5),  b  = 5.016(3),  c  = 8.139(3) Å;  V  = 557.5 Å 3 ,  D x   = 4.121 g cm −3 ,  Z  = 4.  λ (Mo –  Kα ) = 0.71069 Å,  μ (Mo –  Kα ) = 21.2 mm −1 ,  F (000) = 648 electrons, room temperature;  R  = 0.077 for 294 reflections. The structure proves to be similar to that proposed in the space group  Pna 2, for Gd 2 Si 2 O 7  by Smolin and Shepelev (Acta Crystallogr. 26B (1970) 484 – 492). The present work suggests that the space group  Pnam  provides an adequate representation of this structure type in the case of Y 2 Si 2 O 7 .

The crystal structure of δ -yttrium pyrosilicate, δ -Y 2 Si 2 O 7