Search Results - "Negrea, R. F"

On the threshold for ion track formation in CaF2 by Karluši, M, Ghica, C, Negrea, R F, Siketi, Z, Jakši, M, Schleberger, M, Fazini, S

“…There is an ongoing debate regarding the mechanism of swift heavy ion (SHI) track formation in CaF2. The objective of this study is to shed light on this…”
Get full text

Hysteretic Characteristics of Pulsed Laser Deposited 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3/ZnO Bilayers by Silva, J. P. B, Wang, J, Koster, G, Rijnders, G, Negrea, R. F, Ghica, C, Sekhar, K. C, Moreira, J. Agostinho, Gomes, M. J. M

“…In the present work, we study the hysteretic behavior in the electric-field-dependent capacitance and the current characteristics of…”
Get full text

Ultraviolet and visible up-conversion luminescence of Er3+/Yb3+ co-doped CaF2 nanocrystals in sol–gel derived glass-ceramics by Georgescu, S., Voiculescu, A.M., Matei, C., Secu, C.E., Negrea, R.F., Secu, M.

“…Glass-ceramics containing Er3+/Yb3+ codoped CaF2 nanocrystals have been prepared by using the controlled crystallization above 650°C of the (Yb3+/Er3+) codoped…”
Get full text

Ferroelectric switching dynamics in 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 thin films by Silva, J. P. B., Kamakshi, K., Negrea, R. F., Ghica, C., Wang, J., Koster, G., Rijnders, G., Figueiras, F., Pereira, M., Gomes, M. J. M.

“…In this work, the ferroelectric characteristics of 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BCZT) thin films grown on 0.7 wt. % Nb-doped (001)-SrTiO3 (Nb:STO)…”
Get full text

Eu3+ probe ion for rare-earth dopant site structure in sol–gel derived LiYF4 oxyfluoride glass–ceramic by Secu, C.E., Negrea, R.F., Secu, M.

“…•Annealing of Eu3+-doped SiO2–LiYF4 xerogel induces the crystallization of LiYF4 nanocrystals.•Eu3+-ions are embedded in the nanocrystals most probably as Eu–O…”
Get full text

Atomic scale elemental mapping of light elements in multilayered perovskite coatings by Negrea, R.F., Teodorescu, V.S., Ghica, C.

“…•Light elements are visualized and identified using ABF and EELS-SI techniques.•EELS-SI is used to obtain the elemental distribution at atomic resolution.•ABF…”
Get full text

High magnetic field enhancement of the critical current density by Ge, GeO2 and Ge2C6H10O7 additions to MgB2 by Batalu, D., Aldica, G., Popa, S., Miu, L., Enculescu, M., Negrea, R.F., Pasuk, I., Badica, P.

“…Ge, GeO2 and Ge2C6H10O7 additions to MgB2 obtained by ex situ spark plasma sintering significantly enhance the critical current density Jc in high magnetic…”
Get full text

Hysteretic Characteristics of Pulsed Laser Deposited 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 /ZnO Bilayers by Silva, J P B, Wang, J, Koster, G, Rijnders, G, Negrea, R F, Ghica, C, Sekhar, K C, Moreira, J Agostinho, Gomes, M J M

“…In the present work, we study the hysteretic behavior in the electric-field-dependent capacitance and the current characteristics of 0.5Ba(Zr Ti )O -0.5(Ba Ca…”
Get full text

Tungsten nanoparticles with controlled shape and crystallinity obtained by magnetron sputtering and gas aggregation by Acsente, T., Negrea, R.F., Nistor, L.C., Matei, E., Grisolia, C., Birjega, R., Dinescu, G.

“…[Display omitted] •Synthesis of tungsten nanoparticles with concave hexapod and cube-octahedral shapes is reported.•The hexapod nanoparticles present a…”
Get full text

High atomic diffusivity during pulsed laser irradiation of TiON quasi-amorphous films by Teodorescu, V.S., Maraloiu, A.V., Negrea, R.F., Ghica, D., Scarisoreanu, N.D., Dinescu, M., Gartner, M., Blanchin, M.-G.

“…•The evidence of the structure of the TiON quasi-amorphous structure by HRTEM.•The evidence of the laser induced phase transition in this film structure.•Fast…”
Get full text

Luminescent Eosin Y–SiO2 hybrid nano and microrods prepared by sol–gel template method by Secu, M., Secu, C.E., Sima, M., Negrea, R.F., Bartha, C., Dinescu, M., Damian, V.

“…Sol–gel chemistry within the pores of a polycarbonate template membrane was used for the preparation of Eosin Y–SiO2 hybrid nano- and microrods, using…”
Get full text

Functionalized magnetite silica thin films fabricated by MAPLE with antibiofilm properties by Mihaiescu, D E, Cristescu, R, Dorcioman, G, Popescu, C E, Nita, C, Socol, G, Mihailescu, I N, Grumezescu, A M, Tamas, D, Enculescu, M, Negrea, R F, Ghica, C, Chifiriuc, C, Bleotu, C, Chrisey, D B

“…We report on the fabrication of magnetite/salicylic acid/silica shell/antibiotics (Fe(3)O(4)/SA/SiO(2)/ATB) thin films by matrix-assisted pulsed laser…”
Get more information

Ferroelectric properties of ZrO2 films deposited on ITO-coated glass by Silva, J.P.B., Sekhar, K.C., Negrea, R.F., Ghica, C., Dastan, D., Gomes, M.J.M.

“…In this work, the ferroelectric characteristics of ZrO2 thin films grown on ITO-coated glass have been investigated. The ferroelectric nature of the ZrO2 films…”
Get full text

Ferroelectricity in epitaxially strained rhombohedral ZrO2 thin films by Silva, J. P. B, Negrea, R. F, Istrate, M. C, Dutta, S, Aramberri, H, Íñiguez, J, Figueiras, F. G, Ghica, C, Sekhar, K. C, Kholkin, A. L

“…Zirconia and hafnia based thin films have attracted tremendous attention in the last decade due to their unexpected ferroelectric behavior at the nanoscale,…”
Get full text

Progress and perspective on different strategies to achieve wake-up-free ferroelectric hafnia and zirconia-based thin films by Silva, J.P.B., Sekhar, K.C., Negrea, R.F., MacManus-Driscoll, J.L., Pintilie, L.

“…•Ferroelectric binary oxides are of enormous interest for use a negative capacitance dielectrics in gate dielectrics to field-effect transistors (FETs), and in…”
Get full text

On the threshold for ion track formation in CaF 2 by Karlušić, M, Ghica, C, Negrea, R F, Siketić, Z, Jakšić, M, Schleberger, M, Fazinić, S

Get full text

Ferroelectric photovoltaic characteristics of pulsed laser deposited 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3/ZnO heterostructures by Silva, J.P.B., Sekhar, K.C., Cortés-Juan, F., Negrea, R.F., Kuncser, A.C., Connolly, J.P., Ghica, C., Moreira, J. Agostinho

“…[Display omitted] •0.5BZT-0.5BCT/ZnO heterostructures exhibited enhanced photovoltaic (PV) properties.•The enhanced PV effect is attributed to the perfect…”
Get full text

Eu3+ probe ion for rare-earth dopant site structure in sol-gel derived LiYF4 oxyfluoride glassaceramic by Secu, CE, Negrea, R F, Secu, M

“…Sol-gel route using metal alkoxides and trifluoroacetic acid as precursors has been used to prepare oxyfluoride glassaceramic containing Eu3+-doped LiYF4…”
Get full text

Influence of co-dopants average valence on microstructural and electromechanical properties of lead titanate ceramics by Amarande, L., Miclea, C., Cioangher, M., Grecu, M.N., Pasuk, I., Negrea, R.F.

“…Effects of Ni, Nb and Mn co-doping on microstructural, dielectric and electromechanical properties of lead titanate (PT) dense ceramics, obtained as a result…”
Get full text

Luminescent Eosin YaSiO2 hybrid nano and microrods prepared by sol-gel template method by Secu, M, Secu, CE, Sima, M, Negrea, R F, Bartha, C, Dinescu, M, Damian, V

“…Sol-gel chemistry within the pores of a polycarbonate template membrane was used for the preparation of Eosin YaSiO2 hybrid nano- and microrods, using…”
Get full text