Large-scale synthesis of mixed valence K3[Fe2S4] with high dielectric and ferrimagnetic characteristics

Ghazanfari, Mohammad Reza; Santhosh, Archa; Vrijmoed, Johannes C.; Siemensmeyer, Konrad; Peters, Bertram; Dehnen, Stefanie; Jerabek, Paul; Thiele, Günther

doi:10.1039/d2ra05200h

Cited by 2 publications

(1 citation statement)

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“…Sie haben das ferrimagnetische K 3 [Fe 2 S 4 ] phasenrein hergestellt, und zwar aus den Edukten Schwefel, K 2 S und FeS in 5 Minuten bei 1200 °C in einer Silica-Ampulle. 40) Neben Konzentration und Temperatur ist ein grundlegender Reaktionsparameter der Druck. Dessen Veränderung führt bisweilen zu unbekannten Verbindungen.…”

Section: Neue Strukturen Und Verbindungenunclassified

Trendbericht Festkörperchemie und Materialforschung 2024

Rasche,

Schwartz

2024

Nachr Chem

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Schwerpunkte sind die Effizienz von Synthesen, deren Nachhaltigkeit oder Materialien für eine CO2‐emissionsärmere Zukunft. Neben der gesellschaftlichen Dringlichkeit, hervorgerufen durch den Klimawandel, ist dieser Umschwung dadurch motiviert, dass Drittmittel vor allem für Anwendungsforschung vergeben werden. Bei dieser lösungsorientierten Festkörperforschung verschmelzen klassische Chemie, Physik und Materialwissenschaften. Dennoch bleiben Grundlagenthemen essenziell.

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Section: Neue Strukturen Und Verbindungenunclassified

Trendbericht Festkörperchemie und Materialforschung 2024

Rasche,

Schwartz

2024

Nachr Chem

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Structural, optical and giant dielectric constant properties of pure ktenasite and schulenbergite/CuO minerals

Yakout

Youssef

Mousa

2023

J Mater Sci: Mater Electron

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In this study, schulenbergite [(Cu,Zn)7(SO4)2(OH)10·3H2O)]/CuO and pure ktenasite [(Cu,Zn)5(SO4)2(OH)6·6H2O)] minerals were simply synthesized via addition of sodium sulfide (Na2S) to a mixture of nanosized CuO powder dispersed into Zn(NO3)2·6H2O solution. The X-ray diffraction patterns illustrate the formation of schulenbergite/CuO mineral with ratio of 69:31% and 87/13% owing to additions of 0.1 and 0.2 mol L−1 Na2S, respectively. The addition of 0.4 mol L−1 Na2S substance lead to formation of pure ktenasite [(Cu,Zn)5(SO4)2(OH)6·6H2O)] mineral. The absorption vibration modes based on Fourier-transform infrared (FTIR) analysis verified the formation of schulenbergite/CuO and pure ktenasite compositions. The scanning electron microscope micrographs of schulenbergite/CuO and pure ktenasite samples reveal the formation of mixed grains with needle, sheets, cotton and wool shapes. The selected area electron diffraction images of the synthesized powders show strong dot-rings, indicating polycrystalline nature. Optically, all samples possess a high absorption ability for infrared-visible light wavelengths. At lower frequencies, the pellet of pure ktenasite sample exhibits giant dielectric constant characteristics. Exactly, pure ktenasite sample reveals a dielectric constant value of ~ 1.3 × 106 at frequency of 42 Hz. For schulenbergite/CuO (87/13%) sample, a large dielectric constant value of ~ 5311 was measured at frequency of 42 Hz. The colossal and variable relative permittivity values make the pure ktenasite [(Cu,Zn)5(SO4)2(OH)6·6H2O)] mineral is a suggested material for energy storage applications.

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Large-scale synthesis of mixed valence K₃[Fe₂S₄] with high dielectric and ferrimagnetic characteristics

Abstract: Large scale, high purity synthesis of K3[Fe2S4] which indicates soft ferrimagnetic, high dielectric and semiconductive characteristics.

Cited by 2 publications

References 50 publications

Trendbericht Festkörperchemie und Materialforschung 2024

Trendbericht Festkörperchemie und Materialforschung 2024

Structural, optical and giant dielectric constant properties of pure ktenasite and schulenbergite/CuO minerals

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