The magnetic order of Pr ions in polycrystalline, tetragonal PrBa2Cu3O
6.2 has been studied by neutron diffraction measurements. The basic or
dering consists of an antiferromagnetic arrangement with the propagati
on vector k over arrow pointing right = [1/2, 1/2, 1/2]. The three-dim
ensional magnetic ordering is imperfect due to finite correlation leng
th xi(c) = 10 angstrom along the c-axis. The Neel temperature is deter
mined to be T(N) = (12 +/- 1) K, and the magnetic saturation moment of
the Pr ions turns out to be (1.9 +/- 0.2) mu(B).