Grain size-sensitive viscoelastic relaxation and seismic properties of polycrystalline MgO

Torsional forced-oscillation experiments on a suite of synthetic MgO polycrystals, of high-purity and average grain sizes of 1–100 µm, reveal strongly viscoelastic behavior at temperatures of 800–1300°C and periods between 1 and 1000 s. The measured shear modulus and associated strain energy dissipation both display monotonic variations with...

Production of propylene carbonate from carbon dioxide and propylene oxide with MgO as a heterogeneous catalyst