12256-33-6Relevant articles and documents
Exotic Compositional Ordering in Manganese–Nickel–Arsenic (Mn-Ni-As) Intermetallics
Fjellv?g, ?ystein Slagtern,Fjellv?g, Helmer,Gonano, Bruno,Pelloquin, Denis,Saha, Dipankar,Steciuk, Gwladys
supporting information, p. 22382 - 22387 (2020/10/15)
In this work we benefited from recent advances in tools for crystal-structure analysis that enabled us to describe an exotic nanoscale phenomenon in structural chemistry. The Mn0.60Ni0.40As sample of the Mn1?xNixAs solid solution, exhibits an incommensurate compositional modulation intimately coupled with positional modulations. The average structure is of the simple NiAs type, but in contrast to a normal solid solution, we observe that manganese and nickel segregate periodically at the nano-level into ordered MnAs and NiAs layers with thickness of 2–4 face-shared octahedra. The detailed description was obtained by combination of 3D electron diffraction, scanning transmission electron microscopy, and neutron diffraction. The distribution of the manganese and nickel layers is perfectly described by a modulation vector q=0.360(3) c*. Displacive modulations are observed for all elements as a consequence of the occupational modulation, and as a means to achieve acceptable Ni–As and Mn–As distances. This modulated evolution of magnetic MnAs and non-magnetic NiAs-layers with periodicity at approximately 10 ? level, may provide an avenue for spintronics.
Structure and Transport Properties in Itinerant Antiferromagnet RE2(Ni1-xCu x)5As3O2 (RE = Ce, Sm)
Chen, Xu,Guo, Jian-Gang,Gong, Chunsheng,Cheng, Erjian,Song, Yanpeng,Ying, Tianping,Deng, Jun,Li, Shiyan,Chen, Xiaolong
, p. 2770 - 2776 (2019/02/28)
We report the crystal structure and physical properties of two Ni5As3-based compounds RE2Ni5As3O2 (RE = Ce, Sm). The former exhibits structural phase transition from tetragonal (space group I4/mmm, 139) to orthorhombic (space group Immm, 71) symmetry at 230 K, while the latter undergoes a charge-density-wave-like structural distortion with abrupt change of Ni-As bond length. Both compounds show antiferromagnetic transitions due to RE3+ ions ordering at 4.4 and 3.4 K, accompanying with the large enhancement of Sommerfeld coefficients comparing to the nonmagnetic La analogue. Although the Cu substitution for Ni induces structural anomalies and suppression of structural transition like the behaviors in La/Pr/Nd analogues, the superconductivity is not observed in both Cu-doped RE2Ni5As3O2 (RE = Ce, Sm) above 0.25 K. Our structural refinements reveal that the lacking of superconductivity in RE2(Ni1-xCux)5As3O2 might relate to the anomalous increase of As height, h1.
Study of Ni-doping effect of specific heat and transport properties for LaFe1-yNiyAsO0.89F0.11
Kawamata, Takayuki,Satomi, Erika,Kobayashi, Yoshiaki,Itoh, Masayuki,Sato, Masatoshi
, (2011/10/11)
Specific heats and transport quantities of the LaFe 1-yNiyAsO0.89F0.11 system have been measured, and the results are discussed together with those reported previously by our group mainly for LaFe1-yCoyAsO0
Nickel-based layered superconductor, LaNiOAs
Watanabe, Takumi,Yanagi, Hiroshi,Kamihara, Yoichi,Kamiya, Toshio,Hirano, Masahiro,Hosono, Hideo
, p. 2117 - 2120 (2009/02/04)
Rietveld analysis of the powder X-ray diffraction of a new layered oxyarsenide, LaNiOAs, which was synthesized by solid-state reactions, revealed that LaNiOAs belongs to the tetragonal ZrCuSiAs-type structure (P4/nmm) and is composed of alternating stacks of La-O and Ni-As layers. The electrical and magnetic measurements demonstrated that LaNiOAs exhibits a superconducting transition at 2.4 K, and above this, LaNiOAs shows metallic conduction and Pauli paramagnetism. The diamagnetic susceptibility measured at 1.8 K corresponded to ～20percent of perfect diamagnetic susceptibility, substantiating that LaNiOAs is a bulk superconductor.
Ni11as8 single-crystalline nanosheets via hydrothermal redox route
Wei, Shuo,Lu, Jun,Yu, Weichao,Zhang, Houbo,Qian, Yitai
, p. 3844 - 3849 (2008/10/09)
Ni11As8 crystallites 23-nm thick and 250-700-nm wide in lateral dimension were prepared in alkaline hydrothermal condition. Transmission electron microscope (TEM) images and selected area electron diffraction (SAED) analyses showed that the as-prepared Ni11As 8 was single-crystalline nanosheets of [331] orientation. The Ni 11As8 exhibited an optical absorption onset of 3.00 eV in the visible spectral regime. Its magnetic measurement indicated a weak magnetic hysteresis and unsaturation magnetization with a magnetic susceptibility of 1.37 × 10-44 cm3/g (at 15 kOe) at room temperature, the origin of which was discussed and assigned to the effect of surface species containing Ni ions. The extended Hueckel tight-binding calculation revealed that bulk Ni11As8 has a 3d-localized narrow band below Fermi level and complicated band structure with small band gap in the first Brillouin zone, which supply clues to explain the observed optical and magnetic properties. The formation mechanism of Ni11As8 was studied and attributed to an alkaline hydrothermal redox route on the basis of the Marsh reaction.
Liquid ammonia mediated metathesis: Synthesis of binary metal chalcogenides and pnictides
Shaw,Parkin
, p. 6940 - 6947 (2008/10/08)
Addition of stoichiometric amounts of low valent metal halides to liquid ammonia solutions of disodium chalcogenide (Na2E; E = S, Se, Te) afforded a range of both crystalline (PbE (E = S, Se, Te), TIE (E = S, Se), Tl5Te3, Ag2E (E = S, Se, Te)) and X-ray amorphous (MS (M = Ni, Cu, Zn, Cd, Hg), M2E3 (M = Ga, In; E = S, Se, Te), HgE (E = Se, Te), CuE (E = S, Se, Te), Cu2S) metal chalcogenides in good yield (95%). Reactions between metal halides and sodium pnictides (Na3Pn; Pn = As, Sb) in liquid ammonia also afforded X-ray amorphous material (M3Pn2, M = Zn, Cd; MPn, M = Fe, Co, Ni) in good yield (95%). Isolation of the metal chalcogenides and pnictides was achieved through washing with CS2 and distilled water. All reactions were complete within 36 h. Products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDXA), electron probe analysis, FR-IR spectroscopy, Raman spectroscopy, microanalysis, and band gap measurements. Annealing amorphous material at 250-300 °C for 48 h induced sufficient crystallinity for analysis by X-ray powder diffraction.
Liquid-mediated metathetical synthesis of binary and ternary transition-metal pnictides
Carmalt, Claire J.,Morrison, Daniel E.,Parkin, Ivan P.
, p. 829 - 833 (2008/10/08)
Nickel and cobalt pnictides have been synthesised using a liquid-mediated metathetical reaction of transition-metal dihalides with the appropriate sodium pnictide Na3E (E = P, As, Sb) in refluxing toluene for 48 h. Binary and ternary compounds have been prepared. Products were analysed by powder X-ray diffraction, scanning electron microscopy, energy dispersive analysis by X-rays, FT-IR, Raman and vibrating sample magnetometry. (C) 2000 Elsevier Science Ltd.
A safe low temperature route to nanocrystalline transition metal arsenides
Xie, Yi,Lu, Jun,Yan, Ping,Jiang, Xuchuan,Qian, Yitai
, p. 114 - 115 (2007/10/03)
Nanocrystalline FeAs, CoAs and NiAs were prepared by keeping the mixture of FeCl3, CoCl2 or NiCl2 with arsenic and KBH4 in ethylenediamine (en) at 100 °C for 4 h, respectively. X-Ray powder diffraction (XRD) patterns and transmission electron microscope (TEM) images show that the products are orthorhombic FeAs, CoAs and hexagonal NiAs, respectively, and all are well crystalline in nanometers.
Specific heat and de Haas-van Alphen effect in NiAs
Nozue,Kobayashi,Sato,Uesawa,Suzuki,Kamimura
, p. 174 - 176 (2008/10/08)
The specific heat at the temperature range from 1.7 to 30 K and the dHvA effect at 0.55 K in the field up to 9.5 T have been measured for Pauli paramagnetic NiAs. The electronic specific heat coefficient is 3.0 mJ/(K2 mol) which is in good agreement with the value estimated from the calculated density of states. It is found that the dHvA oscillation in the field along [0001] consists of four frequencies which correspond to the extremal areas in the k-space of 0.06, 0.11, 0.16 and 0.18 A-2.
