Abstract
The principal linear coefficients of thermal expansion, alpha /sub /// and alpha perpendicular to , have been measured from 2 to 30 K and 55 to 90 K. Above 10 K they agree with earlier work; from 2-5 K, alpha /sub /// approximately=-0.19*10-8T3 and alpha perpendicular to approximately=0.23*10-8T3...K-1. Limiting values (T to 0) of the principal Gruneisen parameters are gamma /sub ///=-0.7, gamma perpendicular to =1.8 and gamma =2.1.

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