ELECTRIC-FIELD EFFECT ON N-14 NQR AND PIEZOELECTRIC RESONANCE IN (CH2)(6)N-4 POWDER

The electric field effect on N-14 NQR and piezoelectric resonance have been investigated in hexamethylene tetramine [(CH2)(6) N-4] powder. U nder the applied de electric field, only the line broadening of N-14 N QR was observed without any Line shift. The line width turns out to be increased with the electric field (E) at the rate of 10.9 +/- 2.5 Hz cm/kV, which is in good agreement with the previous report. In additio n to the NQR signal, the piezoelectric resonance signal was observed, and its frequency was found to be increased proportionally to E(2). Th e experimental result is discussed in terms of the electrostriction of [(CH2)6 N-4] material.