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Barnhoorn, A. (author), Jackson, I. (author), Fitz Gerald, J. D. (author), Kishimoto, A. (author), Itatani, K. (author)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...journal article 2016