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- W2247658724 abstract "A transition metal ion Cr 4+ (3d 2 spins) doped ZrO 2 of small crystallites presents tailored magnetic, electrical and optical properties useful for magnetodielectric and spintronic applications. A liquid polymer precursor gel (Cr 4+ and Zr 4+ complex with glycerol) when heated in an autoclave at a small pressure 0.6-0.7 atm at 420–470 K results in a compound Zr 0.8 Cr 0.2 O 2 with an average 5 nm crystallite size of a stabilized cubic (c)-ZrO 2 -type phase (after 2 h annealing at 773 K in air). A broad Raman band is observed at ~300 cm -1 in acoustic and transverse optic phonons characteristic of the c-ZrO 2 -type structure, with a prominent O–Cr–O stretching band at 878 cm -1 in a ferromagnetic order. A CrO 2 /Cr 2 O 3 surface layer exhibits two weak bands at ~1011 cm -1 and 1032 cm -1 . The sample exhibits an ‘S’-shaped ferromagnetic hysteresis loop (does not saturate below 60 kOe fields) at 5 K, with a magnetization M = 85.79 emu/g (in the CrO 2 part) at 60 kOe and coercivity H c = 100 Oe. With warming above 5 K, the loop converges progressively with only a weak ferromagnetism at room temperature, M = 9.08 emu/g and H c = 54.2 Oe. As a pinning barrier, the uncompensated spins in the surface layer supports coercivity at low temperature. A model magnetic structure describes the magnetic properties in correlation to the microstructure." @default.
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- W2247658724 date "2014-06-01" @default.
- W2247658724 modified "2023-10-16" @default.
- W2247658724 title "Magnetism in a Spintronic Compound Zr<sub>0.8</sub>Cr<sub>0.2</sub>O<sub>2</sub> of Small Crystallites" @default.
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- W2247658724 doi "https://doi.org/10.4028/www.scientific.net/jnanor.28.101" @default.
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