Dedicated to Professor Hermann NEELS on the occasion of his 65th birthday EPR investigations of Mnz+-doped solid solutions of TSCC and TSCB were performed between 4.2 K and 300 K. The Curie temperature vs. molar fraction of bromide x is nonlinear, for z 2 0.75 no ferroelectric EPR-line splitting occurs. The relation between the line widths and the molar fraction of bromide is discussed by means of a simple statistical model.An festen Losungen von Mn2+-dotiertem TSCC und TSCB wurden zwischen 4,2 K und 300 K EPR-Untersuchungen durchgeftihrt. Die Abhiingigkeit der Curie-Temperatur vom molaren Bromidgehalt z ist nichtlinear, fur z 2 0,75 tritt keine der spontanen Polarisation proportionale EPR-Linien-Aufspaltung mehr auf. Die Beziehung zwischen der Linienbreite und dem molaren Bromidgehalt wird mit Hilfe eines einfachen statistischen Modells diskutiert.
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