Thiourea under a High Electric Field: X-Ray Studies

The existence of several new field-induced regions of stability is shown for the wave number $q$ corresponding to the high commensurability orders $\frac{2}{15}$, $\frac{4}{29}$, and $\frac{6}{43}$. It is suggested that this result can be accounted for intrinsically by sequences of antiphase domains of the type ${〈7〉}^n〈8〉(n=1,3, \mathrm{and} 5)$ where $〈m〉$ represents a domain of $m$ consecutive ferroelectrically aligned layers. A high-field hysteresis effect is also observed.