Floating Zone Growth and High Temperature Hardness of Rare-Earth Hexaboride Crystals: LaB6, CeB6, PrB6, NdB6, and SmB6

Otani, Shigeki; Nakagawa, Hiroshi; Nishi, Yoshimasa; Kieda, Nobuo

doi:10.1006/jssc.2000.8842

Cited by 61 publications

(46 citation statements)

References 7 publications

(2 reference statements)

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“…The intra-octahedral B-B bond (B-B in in this study) is longer than the inter-octahedral bond (B-B out in this study). The shorter length of the in- ter-octahedral bond influences thermal stability and hardness of hexaborides among a number of properties [10].…”

Section: Crystal Structurementioning

confidence: 99%

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Metal Hexaborides with Sc, Ti or Mn

Alarco¹,

Talbot²

2013

MNSMS

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Comparison of well-determined single crystal data for stoichiometric, or near-stoichiometric, metal hexaborides confirms previously identified lattice parameter trends using powder diffraction. Trends for both divalent and trivalent forms suggest that potential new forms for synthesis include Sc and Mn hexaborides. Density Functional Theory (DFT) calculations for KB 6 , CaB 6 , YB 6 , LaB 6 , boron octahedral clusters and Sc and Mn forms show that the shapes of bonding orbitals are defined by the boron framework. Inclusion of metal into the boron framework induces a reduction in energy ranging from 1 eV to 6 eV increasing with ionic charge. For metals with d 1 character, such a shift in energy brings a doubly degenerate band section along with the G-M reciprocal space direction within the conduction bands tangential to the Fermi surface. ScB 6 band structure and density of states calculations show directions and gap characteristics similar to those of YB 6 and LaB 6 . These calculations for ScB 6 suggest that it may be possible to realize superconductivity in this compound if synthesized.

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Section: Crystal Structurementioning

confidence: 99%

“…M = Ca, Sr and Yb) [5,6] while others display intermediate or unusual behavior (e.g. M = Sm, Ce, Nd) [7,8] or have notable thermal stability and hardness [9,10].…”

Section: Introductionmentioning

confidence: 99%

Metal Hexaborides with Sc, Ti or Mn

Alarco¹,

Talbot²

2013

MNSMS

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“…The growth of large crystals of these materials has therefore only been possible by the floating zone technique. In the past this has often been done using R.F power, owing to the very highmelting point of these compounds [3]. Crystals of CaB 6 and SrB 6 are difficult to obtain directly from the melt by the floating zone method due to their high volatility.…”

Section: Introductionmentioning

confidence: 99%

Growth of large single crystals of rare earth hexaborides

Lees

Paul

2003

Journal of Crystal Growth

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“…Floating zone method and electrosynthesis have been also developed conventionally in order to obtain LaB 6 crystals (Verhoeven et al, 1976). Essentially, floating zone method has been carried out to produce single crystals by using laser or RF heating (Otani and Ishizawa, 1996;Otani et al, 2000). Electrosynthesis of LaB 6 crystals has been applied by molten salt technique from an electrolyte consisting of La chlorides/oxides, boron sources (B 2 O 3 , Li 2 B 4 O 7 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Preparation of LaB<sub>6</sub> Powders via Calciothermic Reduction using Mechanochemistry and Acid Leaching

Ağaoğulları

Balcı

Öveçoğlu

et al. 2016

KONA

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This study reports a room temperature mechanochemical route for the synthesis of LaB 6 powders originated from related metal oxide powders as La 2 O 3 and B 2 O 3 . Ca granules and B 2 O 3 powders were respectively used as reducing agent and boron source in the experiments. This study is actually meaningful to create added value by using the native boron source of Turkey for the production of high-technology boron materials. Milling duration as the most important parameter of mechanochemistry was examined to reveal the ideal production conditions. Mechanochemically synthesized powders were subjected to selective HCl leaching in order to eliminate unwanted phases. Thermochemical software of HSC Chemistry TM program was utilized to determine the reaction probability and to estimate the predicted products. Characterization investigations were carried out by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), particle size analyzer (PSA), stereomicroscope (SM), scanning electron microscope (SEM), transmission electron microscope/energy dispersive spectrometer (TEM/EDS) and atomic absorption spectrometer (AAS). Nanosized LaB 6 powders were achieved with/without an insignificant amount of Ca 3 (BO 3 ) 2 phase via mechanochemistry in a high-energy ball mill for 3 h and via leaching with 4 M and 6 M HCl. Lastly, the experimental outputs obtained by a calciothermic reduction were compared with those of magnesiothermic reduction.

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Floating Zone Growth and High Temperature Hardness of Rare-Earth Hexaboride Crystals: LaB6, CeB6, PrB6, NdB6, and SmB6

Cited by 61 publications

References 7 publications

Metal Hexaborides with Sc, Ti or Mn

Metal Hexaborides with Sc, Ti or Mn

Growth of large single crystals of rare earth hexaborides

Preparation of LaB<sub>6</sub> Powders via Calciothermic Reduction using Mechanochemistry and Acid Leaching

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