Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Iosif Grigore"'
Publikováno v:
Results in Physics, Vol 56, Iss , Pp 107306- (2024)
Co-doped ferrites are promising functional materials for many practical applications and their physical properties can be tailored by changing their composition. This study assesses the structure, morphology and magnetic properties of CaxCo1-xFe2O4/S
Externí odkaz:
https://doaj.org/article/78d00a6ebdb24f9ab03679daf3473ad2
Autor:
Thomas Dippong, Iosif Grigore Deac, Mihaela Diana Lazar, Ioan Petean, Erika Andrea Levei, Gheorghe Borodi, Oana Cadar
Publikováno v:
Journal of Materials Research and Technology, Vol 15, Iss , Pp 6528-6540 (2021)
ZnxMn1-xFe2O4@SiO2 nanocomposites (NCs) (x = 0.00, 0.25, 0.50, 0.75, 1.00) were prepared by eco-friendly sol–gel synthesis followed by heat treatment at different temperatures and characterized. The X-ray diffraction shows poorly crystallized ferri
Externí odkaz:
https://doaj.org/article/b2d094eac9c24b80a4ef47ae5d20b99d
Publikováno v:
Nanomaterials, Vol 13, Iss 14, p 2129 (2023)
This work presents the effect of monovalent (Ag+, Na+), divalent (Ca2+, Cd2+), and trivalent (La3+) metal ion doping and annealing temperature (500, 800, and 1200 °C) on the structure, morphology, and magnetic properties of MnFe2O4/SiO2 ceramic nano
Externí odkaz:
https://doaj.org/article/5231183faec24183b705a3e325b133f2
Autor:
Roman Atanasov, Ecaterina Brinza, Rares Bortnic, Razvan Hirian, Gabriela Souca, Lucian Barbu-Tudoran, Iosif Grigore Deac
Publikováno v:
Magnetochemistry, Vol 9, Iss 7, p 170 (2023)
Here we report the synthesis and investigation of bulk and nano-sized La0.7Ba0.3−xCaxMnO3 (x = 0, 0.15, 0.2 and 0.25) compounds that are promising candidates for magnetic refrigeration applications. We compare the structural and magnetic properties
Externí odkaz:
https://doaj.org/article/48405152b1984766b0d3a7c58fe8a89b
Autor:
Thomas Dippong, Erika Andrea Levei, Ioan Petean, Iosif Grigore Deac, Raluca Anca Mereu, Oana Cadar
Publikováno v:
International Journal of Molecular Sciences, Vol 24, Iss 11, p 9703 (2023)
CoFe2O4 is a promising functional material for various applications. The impact of doping with different cations (Ag+, Na+, Ca2+, Cd2+, and La3+) on the structural, thermal, kinetics, morphological, surface, and magnetic properties of CoFe2O4 nanopar
Externí odkaz:
https://doaj.org/article/4b7d0df8b2154d5bb74e7b4356f1cd4f
Autor:
Roman Atanasov, Dorin Ailenei, Rares Bortnic, Razvan Hirian, Gabriela Souca, Adam Szatmari, Lucian Barbu-Tudoran, Iosif Grigore Deac
Publikováno v:
Nanomaterials, Vol 13, Iss 8, p 1373 (2023)
Here we report investigations of bulk and nano-sized Pr0.65Sr(0.35−x)CaxMnO3 compounds (x ≤ 0.3). Solid-state reaction was implemented for polycrystalline compounds and a modified sol–gel method was used for nanocrystalline compounds. X-ray dif
Externí odkaz:
https://doaj.org/article/c7817db35c3843739bffbdee2f6d1126
Publikováno v:
Nanomaterials, Vol 13, Iss 3, p 527 (2023)
(Co0.4Zn0.4Ni0.2Fe2O4)α(SiO2)(100−α) samples obtained by embedding Co0.4Zn0.4Ni0.2Fe2O4 nanoparticles in SiO2 in various proportions were synthesized by sol-gel process and characterized using thermal analysis, Fourier-transform infrared spectros
Externí odkaz:
https://doaj.org/article/509ad53666e64d49a73e8af6e382c332
Magnetic and Magnetocaloric Properties of Nano- and Polycrystalline Manganites La(0.7−x)EuxBa0.3MnO3
Autor:
Roman Atanasov, Rares Bortnic, Razvan Hirian, Eniko Covaci, Tiberiu Frentiu, Florin Popa, Iosif Grigore Deac
Publikováno v:
Materials, Vol 15, Iss 21, p 7645 (2022)
Here, we report synthesis and investigations of bulk and nano-sized La(0.7−x)EuxBa0.3MnO3 (x ≤ 0.4) compounds. The study presents a comparison between the structural and magnetic properties of the nano- and polycrystalline manganites La(0.7−x)E
Externí odkaz:
https://doaj.org/article/cef713933d0e44fe8156dfde299c679d
Publikováno v:
International Journal of Molecular Sciences, Vol 23, Iss 6, p 3097 (2022)
This paper presents the influence of Mn2+ substitution by Ni2+ on the structural, morphological and magnetic properties of Mn1−xNixFe2O4@SiO2 (x = 0, 0.25, 0.50, 0.75, 1.00) nanocomposites (NCs) obtained by a modified sol-gel method. The Fourier tr
Externí odkaz:
https://doaj.org/article/44a6f5573da144028b9bd28805b4ecf4
Autor:
Thomas Dippong, Erika Andrea Levei, Iosif Grigore Deac, Ioan Petean, Gheorghe Borodi, Oana Cadar
Publikováno v:
Nanomaterials, Vol 11, Iss 12, p 3455 (2021)
The structure, morphology and magnetic properties of (Ni0.6Mn0.4Fe2O4)α(SiO2)100−α (α = 0–100%) nanocomposites (NCs) produced by sol-gel synthesis were investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR)
Externí odkaz:
https://doaj.org/article/2b213f15fd11442c92ca0e5b3d1cd5cd