The ionic conductivity of Sc2(WO4)3 at 400C showed a normal decrease with increase in pressure up to 2.9GPa but then increased anomalously at pressures up to 4.3GPa. Synchrotron in situ X-ray diffraction results showed that Sc2(WO4)3 undergoes pressure-induced amorphization at pressures coincident with the reversal in conductivity behaviour. The loss of crystal structure at high pressure may be associated with the property of negative thermal expansion in Sc2(WO4)3.

Anomalous Ionic Conductivity of Sc2(WO4)3 Mediated by Structural Changes at High Pressures and Temperatures. R.A.Secco, H.Liu, N.Imanaka, G.Adachi: Journal of Physics - Condensed Matter, 2002, 14[43], 11285-9