By holding the rectangular parallelepiped specimen between long, thin alumina buffer rods, we can detect the resonance vibration of a specimen even at temperatures above 1800 K. This new technique, in combination with the theory for the calculation of the resonance frequency spectrum of a rectangular parallelepiped specimen, enables us to determine the highhyphen;temperature elastic properties of singlehyphen;crystal materials. The first application of this new device was to determine the elastic stiffness constants of singlehyphen;crystal corundum up to 1825 K.
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