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A simple rotational viscometer has been constructed for measurements at elevated temperatures in the region 10 9  - 2 × 10 12  poise, and has been used to study the deformation of pure fcc lithium sulfate (temperature range 740-860°C) and mixtures of this salt with potassium sulfate. These substances resemble highly-viscous non-NEWTONian liquids, and for a given torque the apparent viscosity can be represented by the conventional relation η=η 0  exp (Q/R T). For pure lithium sulfate, measurements with a torque of 19 × 10 7  dyne-cm gave the values η 0 = 4.24 × 10 -4  poise and Q = 7.4 × 10 4  cal/mole for the two constants.

On the Plastic Deformation of Pure Solid Lithium Sulfate and Lithium—Potassium Sulfate Mixtures