Abstract
AbstractEPR measurements have been made on single crystals of RbMgF3 doped only with chromium or codoped with chromium and lithium. Three kinds of trigonally symmetric Cr3+ spectra were observed. Strong spectrum observed from codoped RbMgF3 is ascribed to Cr3+–Li+ pair centre. Other two centres are identified by considering the signs of the fine structure parameters $b_2^0$. Weak spectrum observed from RbMgF3 doped only with chromium is ascribed to a simply‐substituting Cr3+ ion at the MgII site in the face‐sharing Mg2F9 unit. The spectrum observed after X‐ray irradiation for the above crystal is ascribed to a simply‐substituting Cr3+ ion at the MgI site in the single octahedron unit. Similar Cr3+ centres are identified for hexagonal‐RbZnF3 codoped with chromium and lithium. An empirical rule for the sign and magnitude of the $b_2^0$ parameter among the Cr3+ centres in the hexagonal‐BaTiO3 type fluorides is presented. Site preference substitution by trivalent chromium ion in RbMgF3 was found.
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