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Phase Composition of Samarium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

Abstract

Samarium niobate SmNbO4 (SNO) and tantalate SmTaO4 (STO) thin films (~100 nm) were prepared by sol-gel/spin-coating process on alumina substrates with PZT interlayer and annealing at 1000°C. The precursors of films were synthesized using Nb or Ta tartrate complexes. The improvement of the crystallinity of monoclinic M′-SmTaO4 phase via heating was observed through the coexistence of small amounts of tetragonal T-SmTa7O19 phase in STO precursor at 1000°C. The XRD results of SNO and STO films confirmed monoclinic M-SmNbO4 and M′-SmTaO4 phases, respectively, with traces of orthorhombic O-SmNbO4 (in SNO). In STO film, the single monoclinic M′-SmTaO4 phase was revealed. The surface morphology and topography of thin films were investigated by SEM and AFM analysis. STO film was smoother with roughness 3.2 nm in comparison with SNO (6.3 nm). In the microstructure of SNO film, small spherical (~50 nm) and larger cuboidal particles (~100 nm) of the SmNbO4 phase were observed. In STO, compact clusters composed of fine spherical SmTaO4 particles (~20-50 nm) were found. Effect of samarium can contribute to the formation different polymorphs of these films for the application to environmental electrolytic thin film devices.

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A Comparative Study on the Properties of Potentially Bioactive Glasses Obtained by Sol-Gel Technique and by Melting Mixtures of Oxides

:1081–9, 2013. [16] N. Cioffi et al. - Copper nanoparticle/polymer composites with antifungal and bacteriostatic properties. Chem. Mater. 17:5255–62, 2005. [17] D. Avram, N. Angelescu, D. N. Ungureanu, V. Bratu - Obtaining simple and doped phosphocalcic glasses by using sol-gel technique, JOAM, Vol. 17, No. 7-8, p. 1038 – 1043, July – August 2015. [18] D. Avram, D. N. Ungureanu, N. Angelescu, A. Gheboianu, I. Bancuţă, M. G. Bratu - Study of bioactivity and antimicrobial activity in case of glasses from SiO 2 -CaO - P 2 O 5 ternary system, The Scientific

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Static Corrosion Test of Porous Iron Material with Polymer Coating

Abstract

At present biodegradable implants received increased attention due to their use in various fields of medicine. This work is dedicated to testing of biodegradable materials which could be used as bone implants. The samples were prepared from the carbonyl iron powder by replication method and surface polymer film was produced through sol-gel process. Corrosion testing was carried out under static conditions during 12 weeks in Hank’s solution. The quantity of corrosion products increased with prolonging time of static test as it can be concluded from the results of EDX analysis. The degradation of open cell materials with polyethylene glycol coating layer was faster compared to uncoated Fe sample. Also the mass losses were higher for samples with PEG coating. The polymer coating brought about the desired increase in degradation rate of porous iron material.

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