CRYSTAL-GROWTH OF TRANS-AZOBENZENE IN A MAGNETIC-FIELD OF 80 KOE

The crystal growth of trans-azobenzene (diamegnetism) has been investi gated in a magnetic field of 80 kOe. The crystallographic axes are det ermined by X-ray diffraction and compared with the magnetic axes. The crystals grow so that the magnetic chi(3) axis is parallel to the dire ction of the field. The orientation is explained by the magnetic aniso tropy (chi(2) < chi(1) < chi(3)) Of the crystals. Since the magnetic e nergy has a minimum in the chi(3) direction, the crystals containing a considerable number of unit cells can be stabilized by rotating in th is direction against thermal disordering.