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Cr3+ impurities in ADP crystals have been investigated employing the EPR technique. A detailed study has been made at temperatures higher than the Curie temperature; it is suggested that the Cr3+ impurities are located at an NH4+ site which is accompanied by two neighboring proton vacancies. This is concluded from the directions of the principal axes with respect to the crystal axes. In the paraelectric phase there is only one type of Cr3+ center but below TC there are two different centers probably due to different arrangements of the H+ vacancies.
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Bijvank et al. (1978) studied this question.
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