cubic forms depending on yttrium concentration. Additions of 8 mol % Y 2 O 3 or 12 mol % MgO and CaO in zirconia [9] stabilized the cubic structure with a homogeneous phase. YSZ Crystals (yttrium-stabilized zirconia) show a tetragonal structure that varies from 200 °C to 1200 °C. Recent studies about zirconate phases show that zirconium is optically active [14]. �owever, systems with yttrium addition do not show optical characteristics.The lanthanides series (Ln) are elements characterized by gradual occupation of 4f orbital. The electronic configuration AbstractThis study aims to describe the synthesis and optical characterization of a nanometric zirconium oxide solid solution containing yttrium and lanthanum. Zirconium citrate, yttrium nitrate and lanthanum nitrate were mixed in the ratios: 94 mol% of ZrO 2 -6 mol% of Y 2 O 3 and 92 mol% of ZrO 2 -6 mol % of Y 2 O 3 -2 mol % of La 2 O 3 . FTIR analysis shows organic material in decomposition and thermal analysis shows the transformation from the tetragonal to the monoclinic phase of zirconia, the loss of water molecule and zirconium dehydroxylation. The X-ray diffraction analysis shows a homogeneous phase formation of ZrO 2 -Y 2 O 3 -La 2 O 3 demonstrating that lanthanum addition does not cause phase formation, promoting a solid solution based on zirconia with cubic structure. The photoluminescence spectra show absorption bands at 562 nm and 572 nm (350 °C) and specific absorption bands at 543 nm, 561 nm, 614 nm and 641 nm (900 °C).

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