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132. Univerza v Novi Gorici, Spremljanje, ugotavljanje in zagotavljanje kakovosti, Poročilo za študijsko leto 2016/2017Martina Bergant Marušič, Blaž Belec, Lorena Butinar, IMRE CIKAJLO, Saša Dobričič, Renata Kop, Martin Knez, Boštjan Potokar, Branka Mozetič Vodopivec, Egon Pavlica, Samo Stanič, Tea Stibilj Nemec, Arthur Stepanov, Veronika Piccinini, Anika Velišček, Peter Purg, Aljaž Rener, Nives Štefančič, Ana Toroš, Tanja Urbančič, Matjaž Valant, Aleš Vaupotič, Sabina Zelinšček, 2017, treatise, preliminary study, study Keywords: zagotavljanje kakovosti, visoko šolstvo, univerza
Published in RUNG: 05.02.2018; Views: 4273; Downloads: 0
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133. Unusual magnetodielectric effects in La2CuMnO6 induced by a dynamic crossover in dielectric relaxation at TCJasnamol Pezhumkattil Palakkal, Cheriyedath Raj Sankar, Ajeesh Parayancheri Paulose, Matjaž Valant, Artem Badasyan, Manoj Raama Varma, 2018, original scientific article Abstract: A series of fixed frequency dielectric measurements shows dielectric relaxation in La2CuMnO6, with a dynamic
(Arrhenius to Arrhenius) crossover at TC. The external magnetic field alters the relaxation parameters in the
vicinity of crossover and induces an unusual trend in the magnetodielectric coupling around TC. A large magnetodielectric
coupling of 55% (at 68 K, 4 kHz) and 61% (at 105 K, 285.8 kHz) under a small magnetic field of
5 kOe is discovered. Presence of ferromagnetic short-range correlations above TC and a sign reversal of magnetoresistance
around TC are observed. Specific heat analysis revealed the presence of ferromagnetic, variable
range hopping active charge localized state. The presence of ferromagnetic short-range correlations and the
influence of a core-grain dominated magnetoresistance on the Maxwell-Wagner interfacial polarization are responsible
for the observed large magnetodielectric effect. Both the magnetic ordering and external magnetic
field control the electric dipole relaxation in the material.
Keywords: Double perovskite
Griffiths-like phase
Dielectric
Magnetoresistance
Magnetodielectric
Published in RUNG: 03.01.2018; Views: 3791; Downloads: 0
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140. Photoelectrochemical Water Splitting Studies with nanostructured n and p-type semiconductor electrodesSaim Emin, Matjaž Valant, 2017, published scientific conference contribution abstract (invited lecture) Abstract: Photoelectrochemical water splitting has been demonstrated as a promising way to efficiently split water. Currently, solar-to-hydrogen conversion efficiency using state-of-the-art material combinations in PEC system is in the order of 7%. Fabrication of nanostructured materials with unique morphologies and compositions is an important factor to fully utilize the possibilities in this field. We will present different strategies for the preparation of nanostructured metal oxide thin films by using electrodeposition and wet-chemistry techniques. Focus will be given on the preparation of ZnO and CuO thin films where intermediate phases like Zn(OH)8Cl2.H2O and CuX (X=Br, Cl) were electrodeposited. Wet-chemistry synthesis techniques will be also explored for the preparation of nanostructured WO3 and a-Fe2O3 thin films. Especially, the hot-pyrolysis technique for the preparation of colloidal W and Fe/Fe-oxide nanoparticles will be shown. Spin-coating of W and Fe/Fe-oxide NPs onto optically conductive substrates and subsequent heat treatment of the obtained films was found to be a convenient way for the preparation of nanostructured WO3 and a-Fe2O3 thin films.
Keywords: photoelectrochemical water splitting, colloidal nanoparticles, semiconductor
Published in RUNG: 24.10.2017; Views: 4439; Downloads: 0
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