Single-crystal rings of NbSe3: a system for CDW interference?

Tanda, Satoshi; Kawamoto, Hiroki; Shiobara, M.; Sakai, Yuka; Yasuzuka, Syuma; Okajima, Y.; Yamaya, K.

doi:10.1016/s0921-4526(99)02816-1

Cited by 11 publications

(14 citation statements)

References 3 publications

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“…[1][2][3] The theoretical and experimental attention has been paid to the crystal of these structures. [4][5][6][7] Topological crystals were discovered in 2000 8 and have been researched. First, an NbSe 3 ring crystal was synthesized together with whisker crystals.…”

Section: Introductionmentioning

confidence: 99%

Polyhedral Topological Crystals

Tsubota¹,

Inagaki

Matsuura³

et al. 2011

Crystal Growth & Design

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We synthesized micrometer-scale polyhedral ring-crystals of TaS 3 , by the chemical vapor transportation method. The polyhedral ring-crystals are closed-loop crystals with several vertices. We investigated the crystallinity and flatness of the facets by the electron backscatter diffraction pattern technique, and revealed that the orientation of crystal axis changes abruptly at several points. Observing the size of the crystals, we found a new phase of topological crystals, and proposed a phase diagram of ring-polyhedral crystals in terms of radius and thickness.We proposed the mechanism of polygonization in which the vertices of the polyhedral crystals are formed of concentrated dislocations caused by the distance-dependent interaction between them.

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Section: Introductionmentioning

confidence: 99%

Polyhedral Topological Crystals

Tsubota¹,

Inagaki

Matsuura³

et al. 2011

Crystal Growth & Design

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“…Such "topological crystals," previously observed for TaS 3 , NbSe 3 , and TaSe 3 , apparently form when droplets of molten elemental chalcogen template crystal growth. [42][43][44][45][46] Indeed, Enyashin and Ivanovskiȋ have provided a theoretical basis indicating that NbS 3 ring structures are energetically favorable. 47 Continuing work will be required to understand the formation mechanism of such morphologies in the NbS 3 system and characterize the distortions that accompany crystal bending.…”

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confidence: 99%

Monoclinic structures of niobium trisulfide

et al. 2017

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Two new polymorphs of niobium trisulfide are established by single crystal x-ray diffraction. NbS3-iv crystallizes in the monoclinic space group P21/c with lattice parameters a = 6.7515(5) Å, b = 4.9736(4) Å, c = 18.1315(13) Å, and β = 90.116(2)°. Its structure is based on chains of [NbS6] trigonal prisms containing Nb–Nb pairs with a bond length of 3.0448(8) Å; this pairing causes the chains to corrugate slightly along their axis, a feature also present in triclinic NbS3-i that leads to semiconductor properties. The stacking arrangement of chains is different in these polymorphs, however, with NbS3-i having an ABCDE repeating sequence of chain bilayers and NbS3-iv having an AB repeating sequence. HRTEM studies show the presence of topotactically-oriented intergrown zones and numerous dislocations, which result in mosaic structuring. A second new polymorph, NbS3-v, crystallizes in the monoclinic space group P21/m with lattice parameters a = 4.950(5) Å, b = 3.358(4) Å, c = 9.079(10) Å, β = 97.35(2)°. In contrast to NbS3-iv, NbS3-v maintains fixed a Nb–Nb bond distance of 3.358(4) Å along the chains, and it has an ABCDE repeating sequence of chain bilayers similar to NbS3-i. High resolution scanning transmission electron microscopy (HR-STEM) imaging of an exfoliated NbS3-v nanoribbon shows the continuous [NbS6] chains oriented along the b-axis. These results provide the first firmly established structural data for monoclinic NbS3. In addition, SEM images show the formation of NbS3 rings and cylinders, and a combination of powder x-ray diffraction and Raman spectroscopy provides a way to distinguish between NbS3 polymorphs.

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“…From Table 1 and XRD, these whiskers (straight bundle, Table 1 (5), and curl bundle, (6,7)) are identified to be amphiboles. They contain far less amount of MgO and CaO and much more amount of Fe 2 O 3 and MnO than those of grayish green and brownish green portions of single crystalline host hedenbergite ( Table 1 also shows a varying amount of SO 3 in all analyses of selected area of beam diameter 100 mm.…”

Section: Various Morphologies Of Amphibole Whiskersmentioning

confidence: 99%

“…The growth mechanism is VLS mechanism itself. In the cases of sulfide and selenides also [3][4][5][6], whiskers were grown by CVD method in the presence of excess S or Se, which forms a liquid droplet. Unusual morphologies such as rings, Mobius strips, figure-of-eight crystal strips appear because growing whiskers encircle the surface of liquid droplet of excess Se moving in the vapor phase.…”

Section: Growth Mechanism Of Amphibole Whiskersmentioning

confidence: 99%