Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Razvan Hirian"'
Autor:
Fran Nekvapil, Adina Stegarescu, Ildiko Lung, Razvan Hirian, Dragoș Cosma, Erika Levei, Maria-Loredana Soran
Publikováno v:
Nanomaterials, Vol 13, Iss 23, p 3042 (2023)
A novel nanoporous adsorbent was obtained through the thermal treatment and chemical wash of the wasted crab shells (BC1) and characterized by various techniques. The structure of BC1 at the end of the treatments comprised a mixture of calcite and am
Externí odkaz:
https://doaj.org/article/81a0851f3b35434f8c789371bfbafa7a
Autor:
Geza Lazar, Fran Nekvapil, Razvan Hirian, Branko Glamuzina, Tudor Tamas, Lucian Barbu-Tudoran, Simona Cinta Pinzaru
Publikováno v:
ACS Omega, Vol 6, Iss 42, Pp 27781-27790 (2021)
Externí odkaz:
https://doaj.org/article/4625e6bf01c34995a6087206b9957109
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:
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
Autor:
Adam Szatmari, Rares Bortnic, Gabriela Souca, Razvan Hirian, Lucian Barbu-Tudoran, Fran Nekvapil, Cristian Iacovita, Emil Burzo, Roxana Dudric, Romulus Tetean
Publikováno v:
Nanomaterials, Vol 13, Iss 1, p 189 (2022)
Co1−xZnxFe2O4 nanoparticles (0 ≤ x ≤ 1) have been synthesized via a green sol–gel combustion method. The prepared samples were studied using X-ray diffraction measurements (XRD), transmission electron microscopy (TEM), Raman, and magnetic mea
Externí odkaz:
https://doaj.org/article/64f420fd1ecf4070aa872b63f32190cd
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:
Magnetochemistry, Vol 8, Iss 10, p 124 (2022)
In this work, we demonstrate the possibility of using a soluble ceramic material, 5 wt% CaO, as an additive for an SmCo5/20wt%Fe exchange-coupled nanocomposite obtained by mechanical milling in order to inhibit the grain growth of the soft magnetic p
Externí odkaz:
https://doaj.org/article/4fc0b315f99245dcac57ee65cefa30ac
Autor:
Fran Nekvapil, Iolanda-Veronica Ganea, Alexandra Ciorîță, Razvan Hirian, Lovro Ogresta, Branko Glamuzina, Carmen Roba, Simona Cintă Pinzaru
Publikováno v:
Materials, Vol 14, Iss 16, p 4558 (2021)
The compliance of crab shells traditionally used as a complex natural product for agricultural soil amendment with modern biofertilizers’ quality and safety requirements was investigated. Shells waste from the Blue crab, Callinectes sapidus and the
Externí odkaz:
https://doaj.org/article/eef17e879a43422798354ab677ebba77
Autor:
Deac, Roman Atanasov, Ecaterina Brinza, Rares Bortnic, Razvan Hirian, Gabriela Souca, Lucian Barbu-Tudoran, Iosif Grigore
Publikováno v:
Magnetochemistry; Volume 9; Issue 7; Pages: 170
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://explore.openaire.eu/search/publication?articleId=multidiscipl::f764ed573f051ca73a5bb5c1a6444c05
Autor:
Lovro Ogresta, Fran Nekvapil, Tudor Tǎmaş, Lucian Barbu-Tudoran, Maria Suciu, Rǎzvan Hirian, Mihaela Aluaş, Geza Lazar, Erika Levei, Branko Glamuzina, Simona Cintǎ Pinzaru
Publikováno v:
ACS Omega, Vol 6, Iss 42, Pp 27773-27780 (2021)
Externí odkaz:
https://doaj.org/article/143a32dff8d84c1f9685f6375f84f405