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The Piezo-electric Shear Gauge (PSG) [Christensen & Olsen, Rev. Sci. Instrum.66, 5019, 1995] is a rheometric technique developed to measure the complexshear modulus of viscous liquids near their glass transition temperature. Wereport recent advances to the PSG technique: 1) The data extraction procedureis optimized which extends the upper limit of the frequency range of the methodto between 50 and 70 kHz. 2) The measuring cell is simplified to use only onepiezo-electric ceramic disc instead of three. We present an implementation ofthis design intended for liquid samples. Data obtained with this designrevealed that a soft extra spacer is necessary to allow for thermal contractionof the sample in the axial direction. Model calculations show that flow in theradial direction is hindered by the confined geometry of the cell when theliquid becomes viscous upon cooling. The method is especially well-suited for-- but not limited to -- glassy materials.

Piezo-Electric Shear Rheometry: Further developments in experimental implementation and data extraction