Abstract
PbYb1/2Nb1/2O3 and PbYb1/2Ta1/2O3 single crystals were grown by the flux method. Crystals that were transparent, brown and in the form of an octahedron with well developed {111} faces and edge dimensions up to 6mm were obtained. From XPS analysis the following chemical formulas were found: Pb1.10Yb0.35Nb0.57O2.98 (PYN) and Pb0.84Yb0.83Ta0.60O2.72 (PYT). This shows that the PYN crystal has a composition that is closer to the nominal one in comparison with that of the PYT crystal. The magnetic results show that the amount of magnetic Yb3+ is similar for both compounds. Both compounds are Van Vleck paramagnets as a result of the crystal field effect. The excess of ytterbium in PYT is as non-magnetic Yb2+ situated probably in the lead position due to the ionic radius size and valency similarity. Such ytterbium division into two valencies ensures charge neutrality of the PYT crystal.
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