We measured the mechanical loss of crystalline anisotropic samples (silicon
and sapphire) using a nodal support. The measured quality factor of the si
licon sample reached 1.0 x 10(8) at room temperature. The sapphire sample s
howed lower quality factors, 6.4 x 10(7) at most, which were analytically c
onfirmed to be dominated by surface loss. (C) 2001 Elsevier Science B.V. Al
l rights reserved.