Phosphides of the B31 (MnP) Structure Type.

Rundqvist, Stig; Sillén, Lars Gunnar; Timm, David E.; Motzfeldt, K.; Theander, Olof; Flood, H.

doi:10.3891/acta.chem.scand.16-0287

Cited by 142 publications

(66 citation statements)

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“…Our structural model of the HP FeSe polymorph was unambiguously obtained from the integrated intensities of the single crystal data collected at 8.1 GPa and RT. It is found to correspond to the orthorhombic MnP-type structure 32 ( Table 1, Fig. 1(b)) and features chains of face sharing FeSe6 octahedra along the a axis and, from the first point of view, is not directly symmetry related to the parent LP tetragonal P4/nmm FeSe phase.…”

Section: Hp Structure and The Mechanism Of Lp To Hp Phase Transformationmentioning

confidence: 99%

Complex biphase nature of the superconducting dome of the FeSe phase diagram

et al. 2017

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Single crystal synchrotron X-ray diffraction as a function of temperature and pressure has revealed a complex biphase mixture in superconducting FeSe. Based on our experimental results we construct a phase diagram where structural behavior and superconducting properties of FeSe are found to be correlated. We show that below 6 GPa, where pressure promotes the superconducting critical temperature, the FeSe structure is composed of 2D layers of edge-shared FeSe4 tetrahedra, while above 6 GPa the superconductivity is strongly suppressed on formation of a new orthorhombic polymorph characterized by a 3D network of face sharing FeSe6 octahedra. Therefore changes in topology and connectivity of the FeSe structure are found to be detrimental for superconductivity to exist. This previously controversial crystal structure of the high pressure polymorph of FeSe was also unambiguously determined. High pressure FeSe adopts an orthorhombic MnP-type structure (Pnma) which corresponds to a slightly distorted hexagonal NiAs-type arrangement (P63/mmc). The structural transformation from the low-to high-pressure FeSe polymorph is first order in nature and is manifested as antiparallel displacements within the Fe and Se sublattices.

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Section: Hp Structure and The Mechanism Of Lp To Hp Phase Transformationmentioning

confidence: 99%

Complex biphase nature of the superconducting dome of the FeSe phase diagram

et al. 2017

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“…2.The TPR patterns of other relevant model compounds such as COO, Co304, Mo03, CoMoO, and CoAl,O, can be found elsewhere [ 20,211. The reduction of Co, (PO,),*8H,O starts at 800 K and is completed around 1000 K. The total hydrogen uptake measured is 3.9 mol hydrogen/m01 Co. After reduction XRD showed exclusively diffraction lines which could be attributed to COP [22] and Co2P [23] and not to Co metal which might have been expected.…”

Section: Model Compoundsmentioning

confidence: 99%

Structure of phosphorus containing CoO—MoO3/Al2O3 catalysts

et al. 1990

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Mangnus, P.J.; van Veen, J.A.R.; Eijsbouts, S.; de Beer, V.H.J.; Moulijn, J.A. Published in: Applied Catalysis DOI:10.1016/S0166-9834(00) Published: 01/01/1990 Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACTThe influence of phosphate (P) on the structure of alumina-supported CO-MO catalysts was studied by means of temperature-programmed reduction (TPR). Conclusions deduced from these TPR measurements were supported by Fourier transform infrared (FT-IR) and Raman measurements. Phosphorus added by sequential impregnation or coimpregnation had a great influence on both Co and MO surface structure. Addition of P to an alumina support resulted in the formation of a well dispersed AlPO, surface layer. Next to the phases already reported on Co/Al,O, catalyst, cobalt can be present in interaction with the AlPO, species in Co-P/A&O, catalysts. Coimpregnation of Co and P increased the dispersion of the cobalt species. The influence of P on the distribution of the MO species depends on the P content and the sequence of impregnation. On MO-P catalysts, prepared by coimpregnation, the reducibility of apart of the MO species decreased with increasing P content due to the formation of MO-O-P species. On the catalysts prepared by sequential impregnation of P and MO a part of the MO was present in MOO, crystallites, the other part was very well distributed over the AlPO, surface layer. These results suggest that at high P loadings, MO can be present as a MO-AlPO, surface structure. Both sequential and coimpregnation of Co, MO and ...

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“…Therefore, it is natural to inspect the properties of iron monoarsenide (FeAs)-type materials, which are supposed to provide useful information for the paring mechanism in iron-based superconductors, concerning its relatively simple constitution. However, even though the FeAs single crystal has been known for decades, no superconducting evidences are hitherto discovered in this compound [5][6][7][8][9][10] . Distinct from the so-called "11" type superconductor FeSe 11,12 or the FeAs layers in other iron-based superconductors, FeAs compound crystalizes in a MnP-type orthorhombic structure 13 and shows double-helical magnetic structure at low temperatures 14,15 , which makes it irrelevant to iron-based superconductors.…”

Section: Introductionmentioning

confidence: 99%

“…Not only does this groundbreaking work report the first Cr-based superconductor, it also draws much attention to the transition metal monopnictides once again, most members of which possess the same orthorhombic structure with the pnma space group, such as MnAs, RuAs, CrP, MnP, FeP, CoP, and RuP etc. 6,[17][18][19] . Notably, a recent research 20 on RuP polycrystals claimed that this compound experiences two successive structural phase transitions at 330 K (T 1 ) and 270 K (T 2 ), respectively.…”

Section: Introductionmentioning

confidence: 99%

Optical study of phase transitions in single-crystalline RuP

et al. 2015

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RuP single crystals of MnP-type orthorhombic structure were synthesized by the Sn flux method. Temperature-dependent x-ray diffraction measurements reveal that the compound experiences two structural phase transitions, which are further confirmed by enormous anomalies shown in temperature-dependent resistivity and magnetic susceptibility. Particularly, the resistivity drops monotonically upon temperature cooling below the second transition, indicating that the material shows metallic behavior, in sharp contrast with the insulating ground state of polycrystalline samples. Optical conductivity measurements were also performed in order to unravel the mechanism of these two transitions. The measurement revealed a sudden reconstruction of band structure over a broad energy scale and a significant removal of conducting carriers below the first phase transition, while a charge-density-wave-like energy gap opens below the second phase transition.

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Phosphides of the B31 (MnP) Structure Type.

Cited by 142 publications

References 0 publications

Complex biphase nature of the superconducting dome of the FeSe phase diagram

Complex biphase nature of the superconducting dome of the FeSe phase diagram

Structure of phosphorus containing CoO—MoO3/Al2O3 catalysts

Optical study of phase transitions in single-crystalline RuP

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