IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Substitutional Ta-doping in Y2O3 semiconductor by sol-gel synthesis: experimental and theoretical studies
Autor/es:
DIEGO RICHARD; MARIO RENTERÍA; ARTUR W. CARBONARI
Revista:
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2017 vol. 32
ISSN:
0268-1242
Resumen:
Páginas: 085010-1 a 11.The Pechini sol-gel (PSG) method has been employed for the synthesis of pure and(181Hf→)181Ta-doped Y2O3 nanopowders. We performed a structural characterization from the micro to the subnanoscopic scale by means of scanning electron microscopy, energy dispersive x-ray spectroscopy (EDS), x-ray diffraction, and time-differential perturbed γ-γ angular correlation (PAC) spectroscopy. The results show the formation of the cubic bixbyite structure after a thermal treatment at 1473 K. For the synthesized 181Ta-doped Y2O3, the PACexperiments demonstrate that the impurities are mainly located at both substitutional cationicsites of the bixbyite structure. The experimental investigation was complemented by performingfirst-principles electronic structure calculations for Ta atoms localized at the two cationic sites of the Y2O3 semiconductor structure, which allow the study of the structural and electronicmodifications induced in the host system when the impurities are introduced. These calculationsconfirm that the measured electric-field gradients for the synthesized 181Ta-doped Y2O3correspond to double-ionized impurities located at substitutional defect-free cationic sites of thebixbyite host structure and indicate the site occupancy preference for 181Hf(→181Ta) doping. The behaviour of the site preference of 181Ta impurities with temperature is also discussed. Inaddition to an extensive structural and electronic characterization of pure and Ta-doped Y2O3semiconductor, our results demonstrate that the PSG process is an affordable and effective wayto successfully synthesize these PAC substitutional doped samples.