Three-dimensional buckled honeycomb boron lattice with vacancies as an intermediate phase on the transition pathway from alpha-B to gamma-B

Cited 3 time in webofscience Cited 0 time in scopus
  • Hit : 379
  • Download : 257
In the phase diagram of elemental boron, an unknown high-pressure form was identified as gamma-orthorhombic boron (gamma-B-28), provoking studies of the extraordinary properties of its main building blocks, B-12 icosahedra and B-2 dumbbells. Although two low-pressure phases, alpha- and beta-rhombohedral boron (alpha-B-12 and beta-B-106), are also composed of icosahedra, the detailed kinetics and mechanisms of the structural transition from alpha-B-12 or beta-B-106 to gamma-B-28 remain poorly understood. We report on new metastable boron phases formed during the transition in high-pressure high-temperature conditions that were discovered using the crystal structure search method. The metastable phases are understood to be a three-dimensional buckled defective honeycomb lattice in which boron vacancies lead to a dynamically and mechanically stable structure with triangular motifs. We suggest that the metastable phases act as intermediate states on the transition pathway from alpha-B-12 to gamma-B-28 owing to their structural flexibility and low enthalpies, in the framework of Ostwald's step rule.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017-07
Language
English
Article Type
Article
Keywords

RHOMBOHEDRAL BORON; CRYSTAL-STRUCTURE; POLYMORPHS; DESIGN; FORM

Citation

NPG ASIA MATERIALS, v.9, pp.e400 - e400

ISSN
1884-4049
DOI
10.1038/am.2017.98
URI
http://hdl.handle.net/10203/225338
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
000404988500003.pdf(1.76 MB)Download
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 3 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0