It is shown that, for hexagonal, rhombohedral, and tetragonal crystals, the anisotropy of the solution rate along any direction
v, and that of the radius vector along the same direction
r from the origin to the circumference of a solution body (Lösungskörper in German) produced from an originally sphere crystral, are generally expressed by
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\
oindentwhere
vc,
va and
vb are the solution rates and
rc,
ra, and
rb are the radius vectors along the directions of the
c,
a, and
b axes (the [0001], [11\bar20], and [10\bar10] directions for hexagonal crystal, the [111], [\bar101], and [\bar211] directions for rhombohedral crystal, and the [001], [100], and [110] directions for tetragonal crystal), respectively. θ and \varphi are, respectively, the polar and azimuthal angles of the direction referred to a polar coordinate system of which the polar axis is the
c axis and the zero line for the azimuthal angle is the
a axis, and
n is the order of rotational symmetry around the
c axis of the crystal concerned.
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