Dephasing of spin echoes by multiple heteronuclear dipolar interactions in rotational echo double resonance NMR experiments

Bertmer, Marko; Eckert, Hellmut

doi:10.1016/s0926-2040(99)00050-8

Cited by 230 publications

(280 citation statements)

References 21 publications

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“…50 The rotor period, T r , is a controlled variable used to modulate the extant of dipolar dephasing. Difficulties emerge, however, when at least one of the nuclei is quadrupolar in that neither selective excitation of the central transition nor excitation of the full spectrum is always possible.…”

Section: Experimental Methodsmentioning

confidence: 99%

Intermediate-Range Order of Alkali Disilicate Glasses and Its Relation to the Devitrification Mechanism

et al. 2008

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There are two general mechanisms of devitrification in glass: heterogeneous nucleation of crystals from surfaces and impurities and homogeneous nucleation from the volume. It is thought that structural similarities between glass and crystal at the intermediate-range level influence the mechanism followed; however, there are scarce experimental studies to test this hypothesis. In this paper solid-state nuclear magnetic resonance spectroscopy is used to probe intermediate-range order in sodium and lithium disilicate glasses through measurement of the second moment of the distribution of dipolar couplings. These two glasses undergo heterogeneous and homogeneous nucleation, respectively. The second moments measured for the lithium glass closely follow the trend established by the layered structures of the isochemical crystalline phases, while the same measurements for the sodium glass do not. This observation supports the hypothesis that glasses capable of homogeneous nucleation are structurally more similar to the resulting crystalline phases than those glasses that exhibit only heterogeneous nucleation.

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Section: Experimental Methodsmentioning

confidence: 99%

Intermediate-Range Order of Alkali Disilicate Glasses and Its Relation to the Devitrification Mechanism

et al. 2008

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“…All experiments were performed at room temperature. Magic angle spinning frequencies were 10 kHz for REDOR, 7.5 kHz for RFDR, 14 B, and 29 Si, respectively. The NMR data were processed with matNMR.…”

Section: Methodsmentioning

confidence: 99%

“…This analysis was performed by using the approach developed by Eckert and co-workers. [14,15] The advantage of the use of M 2 is that one can easily check whether a large number of nitrogen atoms without a direct bond to carbon could perhaps also account for the shape of the experimental REDOR curve. The results are shown in Figure 3.…”

mentioning

confidence: 99%

Observation of Direct Bonds between Carbon and Nitrogen in Si‐B‐N‐C Ceramic after Pyrolysis at 1400 °C

2008

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“…In glasses, one generally expects a distribution of spin geometries and magnetic dipole coupling strengths. As previously shown, these problems can be circumvented by limiting the REDOR data analysis to the initial curvature, where ΔS/S o < 0.2 [24,25]. In this limit of short dipolar evolution times, the REDOR curve is found to be geometry-independent and can be approximated by:…”

Section: Rotational Echo Double Resonance (Redor)mentioning

confidence: 99%

Short and Medium Range Order in Ion-Conducting Glasses Studied by Modern Solid State NMR Techniques

Eckert¹

2010

Zeitschrift Für Physikalische Chemie

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Glass Structure / Solid State NMR Spectroscopy / Structure-Property RelationsGlassy ionic conductors have attained considerable importance in the solid state battery technology field. To understand the influence of composition on ionic mobility and transport, information about the local and dynamic environments of the mobile ions in glasses is required. Solid state NMR spectroscopy is one of the most powerful tools for addressing these questions. Our research effort in this area comprises (1) the development of efficient techniques and strategies for the study of disordered materials, (2) the detailed application of optimized measurement and data analysis protocols to different glass systems under systematic compositional variation, and (3) the comprehensive interpretation of the results obtained in the overall literature context. This article attempts to convey a concise overview of our contribution to this field over the period from 2004 to 2010, to describe the most significant insights obtained and to place them into the overall field of Solid State Ionics.

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Dephasing of spin echoes by multiple heteronuclear dipolar interactions in rotational echo double resonance NMR experiments

Cited by 230 publications

References 21 publications

Intermediate-Range Order of Alkali Disilicate Glasses and Its Relation to the Devitrification Mechanism

Intermediate-Range Order of Alkali Disilicate Glasses and Its Relation to the Devitrification Mechanism

Observation of Direct Bonds between Carbon and Nitrogen in Si‐B‐N‐C Ceramic after Pyrolysis at 1400 °C

Short and Medium Range Order in Ion-Conducting Glasses Studied by Modern Solid State NMR Techniques

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