Discovery of elusive structures of multifunctional transition-metal borides

Nanoscale ◽  
2016 ◽  
Vol 8 (2) ◽  
pp. 1055-1065 ◽  
Author(s):  
Yongcheng Liang ◽  
Zhaobing Wu ◽  
Xun Yuan ◽  
Wenqing Zhang ◽  
Peihong Zhang
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Functional Materials ◽  
Important Prerequisite ◽  
Metal Borides

A definitive determination of crystal structures is an important prerequisite for designing and exploiting new functional materials. We find that the long-assumed TMB2phases of multifunctional tungsten and molybdenum borides are in fact a family of complex TMB3polytypes.

scholarly journals Single-crystal structure determination of two new ternary bismuthides: Rh6Mn5Bi18 and RhMnBi3

2018 ◽  
Vol 74 (7) ◽  
pp. 863-869 ◽  
Author(s):  
Peter Kainzbauer ◽  
Klaus W. Richter ◽  
Herta Silvia Effenberger ◽  
Martin C. J. Marker ◽  
Herbert Ipser
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Layer Structure ◽  
Three Dimensional ◽  
Van Der Waals Interactions ◽  
Metal Atoms ◽  
Transition Metal Atoms ◽  
Dimensional Network ◽  
Pearson Symbol

A study of the ternary Rh–Mn–Bi phase diagram revealed the existence of two new ternary bismuthides, viz. hexarhodium pentamanganese octadecabismuthide (Rh6Mn5Bi18) and rhodium manganese tribismuthide (RhMnBi3). Their crystal structures represent new structure types. Rh6Mn5Bi18, with a Wyckoff sequence a f2 g2 i5, crystallizes in the tetragonal system (space group P42/mnm; Pearson symbol tP58), and RhMnBi3, with a Wyckoff sequence a c g i q, crystallizes in the orthorhombic system (Cmmm; oS20). In the Rh6Mn5Bi18 structure, the transition metal atoms are linked into ribbon-like structural units aligned along the [001] direction, whereas planar sheets are formed in RhMnBi3. In both crystal structures, the units formed by the transition metal atoms are enveloped by Bi atoms, which themselves form a loosely bound network. The linkage results in a layer structure for RhMnBi3, while in the case of Rh6Mn5Bi18, a three-dimensional network is formed; the latter, however, contains several areas where Bi...Bi distances suggest van der Waals interactions. Both phases under discussion have analogous structural motifs.

Investigations on structural determination of semi-transition-metal borides

2017 ◽  
Vol 19 (47) ◽  
pp. 31592-31598 ◽  
Author(s):  
Menglong Wang ◽  
Chang Liu ◽  
Mao Wen ◽  
Quan Li ◽  
Yanming Ma
Keyword(s):  
Transition Metal ◽  
Phonon Mode ◽  
Structural Determination ◽  
Metal Borides

The present calculations show a series of semi-transition-metal borides with the long-assumed I4/mcm symmetry are dynamically unstable and I4/m structure is predicted to be both energetically and dynamically stable by freezing the unstable phonon mode.

New developments in the ab initio determination of transition metal alloys phase diagram

1993 ◽  
Vol 90 ◽  
pp. 249-254 ◽  
Author(s):  
C Wolverton ◽  
M Asta ◽  
S Ouannasser ◽  
H Dreyssé ◽  
D de Fontaine
Keyword(s):  
Phase Diagram ◽  
Transition Metal ◽  
Ab Initio ◽  
Metal Alloys ◽  
New Developments ◽  
Transition Metal Alloys

Decomposition of peroxobenzoic acid in benzene catalyzed by transition metal 2,4-pentanedionates

1984 ◽  
Vol 49 (3) ◽  
pp. 673-679 ◽  
Author(s):  
Pavel Lederer ◽  
Eva Mácová ◽  
Josef Vepřek-Šiška
Keyword(s):  
Transition Metal ◽  
Reaction Rate ◽  
Reaction Products ◽  
Acid Decomposition ◽  
Analogous Experiment ◽  
Catalytic Effects

The decomposition of peroxobenzoic acid in benzene was studied, and catalytic effects of Fe(III), Mn(III), Co(II), Co(III), and Cr(III) on the reaction rate and the composition of the reaction mixture were investigated. An analogous experiment carried out in perdeuterobenzene and determination of the distribution of deuterium in the reaction products provided evidence for the participation of the solvent in peroxobenzoic acid decomposition.

scholarly journals Quantitative Determination of the Surface Distribution of Supported Metal Nanoparticles: A Laser Ablation–ICP–MS Based Approach

Chemosensors ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 77
Author(s):  
Davide Spanu ◽  
Gilberto Binda ◽  
Marcello Marelli ◽  
Laura Rampazzi ◽  
Sandro Recchia ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Laser Ablation ◽  
Quantitative Determination ◽  
Metal Nanoparticles ◽  
Total Mass ◽  
Functional Materials ◽  
Metal Extraction ◽  
Ms Analysis ◽  
Icp Ms

A laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) based method is proposed for the quantitative determination of the spatial distribution of metal nanoparticles (NPs) supported on planar substrates. The surface is sampled using tailored ablation patterns and the data are used to define three-dimensional functions describing the spatial distribution of NPs. The volume integrals of such interpolated surfaces are calibrated to obtain the mass distribution of Ag NPs by correlation with the total mass of metal as determined by metal extraction and ICP–MS analysis. Once this mass calibration is carried out on a sacrificial sample, quantifications can be performed over multiple samples by a simple micro-destructive LA–ICP–MS analysis without requiring the extraction/dissolution of metal NPs. The proposed approach is here tested using a model sample consisting of a low-density polyethylene (LDPE) disk decorated with silver NPs, achieving high spatial resolution over cm2-sized samples and very high sensitivity. The developed method is accordingly a useful analytical tool for applications requiring both the total mass and the spatial distribution of metal NPs to be determined without damaging the sample surface (e.g., composite functional materials and NPs, decorated catalysts or electrodic materials).

Discovery of intrinsic two-dimensional antiferromagnets from transition-metal borides

Nanoscale ◽  
2021 ◽  
Author(s):  
Shiyao Wang ◽  
Nanxi Miao ◽  
Kehe Su ◽  
Vladislav A. Blatov ◽  
Junjie Wang
Keyword(s):  
Transition Metal ◽  
Magnetic Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Metal Borides

Intrinsic two-dimensional (2-D) magnets are promising materials for developing advanced spintronic devices. Few have already been synthesized from the exfoliation of the van der Waals magnetic materials. In this work,...

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