Electron Paramagnetic Resonance (EPR) in Boron Nitride, Boron and Boron Carbide

Geist, D.

doi:10.1007/978-3-642-66620-9_6

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…Obviously, without more detailed knowledge of the transport mechanisms of band type and hopping charge carriers, the low-field Hall effect does not yield quantitatively utilizable results. , spin density [42]; , [49,50] spin densities showing the strong spreading for differently prepared samples of nominally the same composition; properties for comparison; , free hole densities (Drude type), [34,35]; , free hole density, estimated from SdH oscillations (this work), experimental results [44]; , Hall density measured in high magnetic field (B = 0-15 T), [44]; •, Hall density [43]; •, Hall density [38].…”

Section: Charge Transport In Icosahedral Boron-rich Solidsmentioning

confidence: 89%

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Are there bipolarons in icosahedral boron-rich solids?

Werheit

2007

J. Phys.: Condens. Matter

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The charge transport of boron carbide, often incorrectly denoted as B(4)C, has been controversially discussed. It is shown that the bipolaron hypothesis is not compatible with numerous experimental results. In particular, the determined real microstructure of boron carbide and its related electronic properties disprove several assumptions, which are fundamental to the bipolaron hypothesis. In contrast, the actual energy band scheme derived mainly from optical investigations is confirmed by careful evaluation of the high-temperature electrical conductivity, and allows a consistent description at most of the experimental results.

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Section: Charge Transport In Icosahedral Boron-rich Solidsmentioning

confidence: 89%

“…The decrease in carrier mobility with increasing temperature fundamentally contradicts the (bi)polaron model. G -• -G, [49,50].…”

Section: Boron Carbidementioning

confidence: 99%

Are there bipolarons in icosahedral boron-rich solids?

Werheit

2007

J. Phys.: Condens. Matter

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“…1718 ' 21 ' 22 In sample C this ten-line spectrum was observed to be superimposed on a large broad signal (with a linewidth A/fas large as 500 G) as shown in Fig. 3(c), where the sharp signal at the center is presented on an expanded scale in Fig.…”

Section: Resultsmentioning

confidence: 83%

“…3(a)]. In constrast, sample B yielded a typical ten-line signal attributed to unpaired electrons trapped by isolated single nitrogen vacancies, 21 which interact with three equivalent "B nuclei with a spin of 3/2. The linewidth of the tenline spectrum determined for the peak of the envelope of the ten peak spectrum was 27 G and showed good agreement with the values previously reported.…”

Section: Resultsmentioning

confidence: 99%

Cesium and bromine doping into hexagonal boron nitride

1986

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Using a two-zone method, the possible formation of an intercalation compound of hexagonal boron nitride (BN) with Cs and Br 2 was investigated. Only a few percent weight increase was observed by doping BN with Cs and Br 2 . The electron paramagnetic resonance (EPR) signal was significantly modified by Cs doping, which is attributed to the reaction between the Cs atoms and spin resonance centers (N vacancies) in BN; no change in the EPR spectra was observed with Br 2 doping. However, the deep blue colored Cs-BN complex reported by Mugiya and co-workers was not obtained with the two-zone method. Though no evidence of systematic intercalation reaction in BN was observed in contrast to graphite host materials, intercalation islands induced by the introduction of Cs atoms were suggested by the transmission electron microscopy (TEM) observations.

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“…T HE nature of the paramagnetic centers (PC) in boron carbide is of significant interest. [1][2][3][4][5][6][7] In Ref. 7, it was concluded that, for the typical EPR signal with g ϭ 2.0028, a type of radical formation B 3 C ⅐ with local concentration N loc ϳ 10 19 /2 .…”

Section: Introductionmentioning

confidence: 99%

EPR‐Characterization of Carbon Inclusions in Boron Carbide

Kakazey

Vlasova

Domínguez-Patiño

et al. 2004

Journal of the American Ceramic Society

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In boron carbide, the dependence of EPR line width (ΔB) with g= 2.0028 on the contents of free carbon, cC, is used to determine the surface‐to‐volume ratio (S/V) of free carbon inclusions. Consecutive reduction of cC was conducted by a method of low‐vacuum oxidation at a range of temperatures. The amount of a free carbon (a graphite phase) in samples was measured by X‐ray. Analysis of changes in ΔB (cC) has shown that free carbon inclusions at the surface layer of polycrystalline boron carbide particles has S/V two times smaller than that of free carbon inclusions in the interior of polycrystalline boron carbide.

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Electron Paramagnetic Resonance (EPR) in Boron Nitride, Boron and Boron Carbide

Cited by 16 publications

References 23 publications

Are there bipolarons in icosahedral boron-rich solids?

Are there bipolarons in icosahedral boron-rich solids?

Cesium and bromine doping into hexagonal boron nitride

EPR‐Characterization of Carbon Inclusions in Boron Carbide

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