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• W2139952009 abstract "Perovskite compounds are among the most interesting mixed metal oxide materials in terms of their optical, magnetic, ferroelectric and multiferroic properties. The synthesis of these compounds as nanoparticles is of fundamental importance as size reduction and shape engineering allow modification and tuning of their fundamental properties. SrHfO3 and CaHfO3 perovskite nanoparticles as small as 1.6nm in diameter were synthesized via a non-aqueous sol-gel process recently developed as alternative to conventional hydrolytic routes. The synthesis procedures were carried out in a glove box using metallic strontium (Sr) or calcium methoxide (Ca(OCH3)2) and hafnium (IV) tert-butoxide (Hf(OBu)4) mixed into benzyl alcohol. The mixture was transferred into a stainless steel autoclave, carefully sealed and then heated in a furnace at 250 oC for 2 days. An important advantage of this method is the possibility to synthesize pure and highly crystalline nanosized perovskite (ABO3)-type oxide nanoparticles at low temperatures and without use of surfactant. The structural properties of these nanoparticles were studied by XRD, TGA, SEM, HRTEM, XPS. XPS showed that calcium and hafnium take the expected oxidation state +II and +IV in the CaHfO3 perovskite nanoparticles respectively. High-resolution transmission electron microscopy micrographs presented in Figures 1a and 1b reveal high crystallinity of the defect free nanoparticles and that they possess the perovskite structure (power spectrum inset figure 1b). Upon cerium or europium doping, these perovskite nanoparticles exhibit certain luminescence from an otherwise optically inactive matrix material. However, photoluminescence (PL) study of undoped perovskite nanoparticles at room temperature revealed two important features. Firstly, an unexpectedly strong luminescence in the UV-visible region was observed for both types of nanoparticles. Secondly, spectral instability under continuous UV illumination became immediately apparent, exhibiting different trends for SrHfO3 and CaHfO3 nanoparticles. To get a better insight into these processes, more systematic PL measurements were carried out as a function of temperature (10-300K), UVexposure time (0-15min) and surrounding ambient (air/vacuum). The influence of these parameters will be discussed and a tentative model will be proposed to explain these phenomena in terms of luminescent centers located at the surface of the nanoparticles." @default.
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• W2139952009 date "2011-01-01" @default.
• W2139952009 modified "2023-10-16" @default.
• W2139952009 title "Photoluminescence Study of CaHfO3 and SrHfO3 Nanoparticles Synthesized Via Non-Aqueous Sol-Gel Process" @default.
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• W2139952009 doi "https://doi.org/10.1149/ma2011-02/47/2640" @default.
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