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Spinel

About: Spinel is a(n) research topic. Over the lifetime, 18795 publication(s) have been published within this topic receiving 409296 citation(s). The topic is also known as: pinche pink diamond.

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Journal ArticleDOI: 10.1016/0022-1902(59)80070-1
F.K. Lotgering1Institutions (1)
Abstract: A new method is described for the preparation of polycrystalline materials with oriented crystals by reaction of the oriented grains of a strongly anisotropic ferrimagnetic with non-oriented grains of usually non-magnetic components. Using this type of reaction, for which the name “topotactical (or “topotaxial”) reaction” is proposed, oriented samples of Ba3CoδZn2−δFe24O41, BaCoδZn2−δFe16O27, Ba2Zn2Fe12O22 and BaCoδTiδFe12−2δO19, which have related hexagonal crystal structures, have been prepared as well as some ferrites having the cubic spinel structures.

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Topics: Spinel (53%), Ferrimagnetism (53%), Crystallite (51%)

1,717 Citations


Journal ArticleDOI: 10.1016/0167-2738(94)90450-2
01 Apr 1994-Solid State Ionics
Abstract: The rechargeable capacity of 4 V LixMn2O4 spinel cathodes (0

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Topics: Lithium (58%), Spinel (56%)

1,286 Citations


Open accessJournal ArticleDOI: 10.1021/JA210924T
Yongye Liang1, Hailiang Wang1, Jigang Zhou, Yanguang Li1  +3 moreInstitutions (1)
Abstract: Through direct nanoparticle nucleation and growth on nitrogen doped, reduced graphene oxide sheets and cation substitution of spinel Co3O4 nanoparticles, a manganese–cobalt spinel MnCo2O4/graphene hybrid was developed as a highly efficient electrocatalyst for oxygen reduction reaction (ORR) in alkaline conditions Electrochemical and X-ray near-edge structure (XANES) investigations revealed that the nucleation and growth method for forming inorganic–nanocarbon hybrids results in covalent coupling between spinel oxide nanoparticles and N-doped reduced graphene oxide (N-rmGO) sheets Carbon K-edge and nitrogen K-edge XANES showed strongly perturbed C–O and C–N bonding in the N-rmGO sheet, suggesting the formation of C–O–metal and C–N–metal bonds between N-doped graphene oxide and spinel oxide nanoparticles Co L-edge and Mn L-edge XANES suggested substitution of Co3+ sites by Mn3+, which increased the activity of the catalytic sites in the hybrid materials, further boosting the ORR activity compared with th

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Topics: Oxide (58%), Cobalt oxide (58%), Spinel (57%) ...read more

1,080 Citations


Open accessPosted Content
Abstract: Through direct nanoparticle nucleation and growth on nitrogen doped, reduced graphene oxide sheets and cation substitution of spinel Co3O4 nanoparticles, a manganese-cobalt spinel MnCo2O4/graphene hybrid was developed as a highly efficient electrocatalyst for oxygen reduction reaction (ORR) in alkaline conditions. Electrochemical and X-ray near edge structure (XANES) investigations revealed that the nucleation and growth method for forming inorganic-nanocarbon hybrid results in covalent coupling between spinel oxide nanoparticles and N-doped reduced graphene oxide (N-rmGO) sheets. Carbon K-edge and nitrogen K-edge XANES showed strongly perturbed C-O and C-N bonding in the N-rmGO sheet, suggesting the formation of C-O-metal and C-N-metal bonds between N-doped graphene oxide and spinel oxide nanoparticles. Co L-edge and Mn L-edge XANES suggested substitu-tion of Co3+ sites by Mn3+, which increased the activity of the catalytic sites in the hybrid materials, further boosting the ORR activity compared to the pure cobalt oxide hybrid. The covalently bonded hybrid afforded much greater activity and durability than the physi-cal mixture of nanoparticles and carbon materials including N-rmGO. At the same mass loading, the MnCo2O4/N-graphene hybrid can outperform Pt/C in ORR current density at medium overpotentials with superior stability to Pt/C in alkaline solutions.

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Topics: Cobalt oxide (60%), Oxide (59%), Spinel (56%) ...read more

1,035 Citations


Journal ArticleDOI: 10.1016/0022-4596(85)90290-7
Abstract: In the Sc 2 O 3 Ga 2 O 3 CuO, Sc 2 O 3 Ga 2 O 3 ZnO, and Sc 2 O 3 Al 2 O 3 CuO systems, ScGaCuO 4 , ScGaZnO 4 , and ScAlCuO 4 with the YbFe 2 O 4 -type structure and Sc 2 Ga 2 CuO 7 with the Yb 2 Fe 3 O 7 -type structure were obtained. In the In 2 O 3  A 2 O 3  B O systems ( A : Fe, Ga, or Al; B : Mg, Mn, Fe, Ni, or Zn), InGaFeO 4 , InGaNiO 4 , and InFe 3+ MgO 4 with the spinel structure, InGaZnO 4 , InGaMgO 4 , and InAlCuO 4 with the YbFe 2 O 4 -type structure, and In 2 Ga 2 MnO 7 and In 2 Ga 2 ZnO 7 with the Yb 2 Fe 3 O 7 -type structure were obtained. InGaMnO 4 and InFe 2 O 4 had both the YbFe 2 O 4 -type and spinel-type structures. The revised classification for the crystal structures of AB 2 O 4 compounds is presented, based upon the coordination numbers of constituent A and B cations.

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Topics: Spinel (50%)

1,024 Citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202247
2021897
2020979
2019911
2018867
2017921

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Topic's top 5 most impactful authors

Yang-Kook Sun

56 papers, 3K citations

Arumugam Manthiram

49 papers, 3K citations

Ayyar Manikandan

33 papers, 1.9K citations

Michael M. Thackeray

33 papers, 2.1K citations

Masaki Yoshio

23 papers, 1K citations

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