Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Abstract

The electron paramagnetic resonance spectra of Mn2+ doped in MeH,(Se0,)2 (Me = Li, Na, K, and Rb) single crystals have been studied at 298 K. In LiH,(Se0,)2, an axis of non-coincidence effect has been observed and Mn2+ spectra show line broadening of outer transitions. In NaH,(Se0,)2, Mn2+ substitutes for Na+ ions and is associated with second nearest neighbour Na+ ion vacancies. Below the ferroelectric phase transition temperature of this crystal every line of the spectrum appears to split into two. The spectra of Mn2+ doped LiH,(Se0,)2 and NaH,(SeO,), (in paraelectric phase) have been analysed using the spin-Hamiltonian for rhombic symmetry. However, in KH,(Se0J2 and RbH,(Se0,)2 the Mn2+ ions give only one line. The linewidths and g values of the lines for KH,(Se0,)2 and RbH,(SeO,), are AH,,, = 154 2 15 G, g = 1.988 2 0.008, and AH,, = 102 2 10 G, g = 1.998 2 0.006, respectively.Les spectres de resonance paramagnetique electronique de Mn2+ dope dans des monocristaux de MeH,(SeO,), (Me = Li, Na, K et Rb) ont ete ttudies a 298 K. Dans LiH,(SeO,),, un axe d'effet de non-coincidence a ett observe, et les spectres de Mn2+ presentent un elargissement des raies pour les transitions exterieures. Dans NaH,(SeO,),, Mn2+ se substitue a des ions Na+ et se trouve associe a des lacunes Na+ en position de deuxiemes voisins. Au-dessous de la temperature de transition a la phase ferroelectrique, pour ce cristal, chacune des raies du spectre parait se dedoubler. Les spectres de LiH3(Se0,)2 et NaH,(SeO,), (dans la phase para-electrique) dopes avec Mn2+ ont ete analyses en utilisant I'hamiltonien de spin pour la symetrie rhombique. Dans KH,(SeO,), et RbH,(SeO,), cependant, lesions Mn2+ ne donnent qu'une seule raie. Les largeurs de ces raies et les valeurs deg pour KH3(Se03)2 et RbH,(SeO,), sont respectivement: AH,, = 154 2 15G,g = 1.988?0.008etAH,,,= 1 0 2 2 1 0 G , g = 1.998t0.006. Can. J. Phys., 56,807 (1978) [Traduit par lejournal]

EMR and optical study of Mn2+ doped potassium trihydrogen selenite

“…Their values are given in Table 2 for comparison. The crystalline imperfection was given as the cause to the large zero field splittings [10] in these crystals.…”

EPR of Cu2+ in Ferroelectric LiH3(SeO2)2 Single Crystals

“…Jain and Venkateswarlu [6][7] have reported the EPR of Mn 2+ and V0 2 an EPR study of Cu 2+ in LHS single crystal at 298 K.…”