An insert for anelastic spectroscopy measurements from 80 K to 1100 K

We describe an insert for measurements of the complex elastic moduli between liquid N2 temperature and over 1000 K. The system has been tested with free flexural vibrations of bar-like samples suspended on thermocouple wires with electrostatic excitation and capacitive detection of the vibration, providing excellent measurements with elastic energy loss coefficients between 3 × 10-6 and 0.1. The specially designed system for regulating the distance between the electrode and the sample would also allow optical detection of the vibration through optic fibers.