Raman study of color-zoning cubic boron nitride single crystals

Hou, Lei; Chen, Zhanguo; Wang, Qi; Liu, Xiuhuan; Gao, Yan; Jia, Gang

doi:10.1016/j.ijleo.2017.11.115

Cited by 2 publications

(2 citation statements)

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“…Thus, recent studies by analytical high-resolution scanning transmission electron microscopy/transmission electron microscopy [a-(HR)STEM/TEM], cathodoluminescence, ionoluminescence, and electron spin resonance (ESR) evidenced the presence and non-uniform distribution of certain impurities incorporated in the cBN crystallites. 14 − 17 As reported here, tin (Sn) is such an impurity, which we found in dark BORAZON CBN Type 1 crystallites.…”

Section: Introductionsupporting

confidence: 76%

“…The main reason is the extreme difficulty of preparing enough large (mm-sized), good quality single crystals with controlled impurity content, as required for physical investigations. − With recent advances in microanalysis and microstructural techniques using electron beams, , it is now possible to investigate the presence, nature, and aggregation state of the impurities incorporated in the submillimeter-sized cBN crystallites found in large-sized commercial superabrasive powders. Thus, recent studies by analytical high-resolution scanning transmission electron microscopy/transmission electron microscopy [a-(HR)STEM/TEM], cathodoluminescence, ionoluminescence, and electron spin resonance (ESR) evidenced the presence and non-uniform distribution of certain impurities incorporated in the cBN crystallites. − As reported here, tin (Sn) is such an impurity, which we found in dark BORAZON CBN Type 1 crystallites.…”

Section: Introductionsupporting

confidence: 55%

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Microstructure and Conduction Electron Quantum Properties of Small Diamond Cubic α-Sn Nanocrystals Embedded in Cubic Boron Nitride Crystals

Nistor

Stefan

et al. 2022

ACS Omega

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The morphology, structure, composition, and conduction electron properties of quasi-spherical tin nanocrystals (NCs) of 2.5 nm average diameter, with unstrained, bulk-like α-Sn diamond cubic structure, observed in dark cubic boron nitride (cBN) crystallites, were determined by correlated analytical high-resolution scanning transmission electron microscopy and multifrequency electron spin resonance (ESR) investigations. The narrow Lorentzian ESR line with g = 2.0028 is attributed to the conduction ESR of the α-Sn NCs, consistent with the temperature-and frequency-independent small g-shift and intensity reduction under high temperature (950 °C) vacuum annealing when the α-Sn NCs are thermally dissolved in the host cBN crystallites. The ESR linewidth and line intensity vs temperature dependences recorded in the 20 to 295 K range are quantitatively described considering the presence of discrete, quantum confinement-induced conduction electron energy levels with Δ QC /k B = 125 K separation, close to the theoretical value for conductive α-Sn NCs of 2.5 nm in diameter. The observed properties are tentatively explained with the predicted nanosize induced band-gap opening and change of band ordering from bulk α-Sn to small unstrained α-Sn NCs, resulting in a topological phase transition that also explains the predominantly s-like character of the conduction band electron orbitals.

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Section: Introductionsupporting

confidence: 76%