A Low Temperature (10 K) High-Frequency (208 GHz) EPR Study of the Non-Kramers Ion Mn3+ in a MnMo6Se8 Single Crystal

Misra, Sushil K.; Regler, Benjamin

doi:10.1007/s00723-012-0380-3

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…It is associated with relatively narrow distributions of ZFS parameter values, implying minor site-to-site variations in the local structure of Mn 2+ ions. It should be noted that a contribution of Mn 4+ signals to room temperature EPR spectra cannot be excluded; however, no signals associated with Mn 3+ are expected under our experimental settings 52 – 54 . Secondly, the magnetic field range of the observed resonances and, hence, the magnitude of ZFS increases in the order of γ → β → α.…”

Section: Resultsmentioning

confidence: 80%

Synthesis, structural and luminescent properties of Mn-doped calcium pyrophosphate (Ca2P2O7) polymorphs

Griesiūtė

Kareiva

Antuzevičš

et al. 2022

Sci Rep

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In the present work, three different Mn2+-doped calcium pyrophosphate (CPP, Ca2P2O7) polymorphs were synthesized by wet co-precipitation method followed by annealing at different temperatures. The crystal structure and purity were studied by powder X-ray diffraction (XRD), Fourier-transform infrared (FTIR), solid-state nuclear magnetic resonance (SS-NMR), and electron paramagnetic resonance (EPR) spectroscopies. Scanning electron microscopy (SEM) was used to investigate the morphological features of the synthesized products. Optical properties were investigated using photoluminescence measurements. Excitation spectra, emission spectra, and photoluminescence decay curves of the samples were studied. All Mn-doped polymorphs exhibited a broadband emission ranging from approximately 500 to 730 nm. The emission maximum was host-dependent and centered at around 580, 570, and 595 nm for γ-, β-, and α-CPP, respectively.

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Section: Resultsmentioning

confidence: 80%

Synthesis, structural and luminescent properties of Mn-doped calcium pyrophosphate (Ca2P2O7) polymorphs

Griesiūtė

Kareiva

Antuzevičš

et al. 2022

Sci Rep

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“…S2) shows two distinct types of signals: Mn 2+ and Mn 4+ . The Mn 3+ , often referred to as the "EPR silencing" ion, manifests notable zero-field splitting, rendering its EPR spectrum undetectable at low frequencies in the conventional X-band (~9.5 GHz) [42][43][44] . Based on first principles analysis of the Mn valence effect on polarization, it can be concluded that doping with 0.5 mol% Mn 2+ is beneficial for improving the polarization of NBT-SBT ceramics.…”

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confidence: 99%

Enhanced energy storage density and efficiency in NBT-based MLCCs via a cooperative optimization of polarization and grain alignment

Li,

Fan

et al. 2024

Preprint

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Dielectric ceramics possess a unique competitive advantage in electronic systems due to their high-power density and excellent reliability. Na0.5Bi0.5TiO3 (NBT)-based ceramics, one type of extensively studied energy storage dielectric, however, often experience A-site element volatilization and Ti4+ reduction during high-temperature sintering. These issues may result in increased energy loss, reduced polarization and low dielectric breakdown electric field (EB), ultimately making it challenging to achieve both high energy storage density (Wrec) and efficiency (η). To address these issues, we introduce a synergistic optimization strategy that combine polarization engineering and grain alignment engineering. First principles calculations and experimental analyses show that the doping of Mn2+ can suppress the reduction of Ti4+ in NBT-based ceramics and enhance ion off-centering displacements, thereby reducing energy loss and improving polarization. In addition, we prepared multilayer ceramic capacitors (MLCCs) with grains oriented along the <111> direction using the template grain growth method. This approach effectively reduces electric-field-induced strain by 37% and markedly enhances EB by 42% when compared with nontextured counterpart. As a result of this comprehensive strategy, <111>-textured NBT-based MLCCs achieve an ultra-high energy density of 15.7 J·cm-3 and an excellent η beyond 95% at 850 kV·cm-1, exhibiting a superior overall energy storage performance.

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Multifrequency Transition Ion Data Tabulation

Misra

Moncrieff

Diehl

2014

Multifrequency Electron Paramagnetic Resonance

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A Low Temperature (10 K) High-Frequency (208 GHz) EPR Study of the Non-Kramers Ion Mn3+ in a MnMo6Se8 Single Crystal

Cited by 3 publications

References 8 publications

Synthesis, structural and luminescent properties of Mn-doped calcium pyrophosphate (Ca2P2O7) polymorphs

Synthesis, structural and luminescent properties of Mn-doped calcium pyrophosphate (Ca2P2O7) polymorphs

Enhanced energy storage density and efficiency in NBT-based MLCCs via a cooperative optimization of polarization and grain alignment

Multifrequency Transition Ion Data Tabulation

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