Uncommon first universality of conductivity in superprotonic (NH4)3H(SeO4)2 single crystals

Ławniczak, Paweł; Zdanowska-Fra̧czek, M.; Lindner, Łukasz; Pawłowski, A.

doi:10.1039/c8cp07513a

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…However, in (NH 4 ) 3 H(SeO 4 ) 2 superprotonic conductor first universality of conductivity was not observed, due to existence of unique low conducting, ferroelastic phase III of symmetry (P 1) [56]. This phase is unstable and under sufficient high pressure disappears [56].…”

Section: Scaling Of the Frequency Dependent Conductivitymentioning

confidence: 99%

Proton dynamics in superprotonic Rb₃H(SeO₄)₂ crystal by broadband dielectric spectroscopy

Ławniczak

Petzelt

Bovtun

et al. 2020

J. Phys.: Condens. Matter

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Broadband dielectric and AC conductivity spectra (1 Hz to 1 THz) of the superprotonic single crystal Rb3H(SeO4)2 (RHSe) along the c axis were studied in a wide temperature range 10 K < T < 475 K that covers the ferroelastic (T < 453 K) and superprotonic (T > 453 K) phases. A contribution of the interfacial electrode polarization layers was separated from the bulk electrical properties and the bulk DC conductivity was evaluated above room temperature. The phase transition to the superprotonic phase was shown to be connected with the steep but almost continuous increase in bulk DC conductivity, and with giant permittivity effects due to the enhanced bulk proton hopping and interfacial electrode polarization layers. The AC conductivity scaling analysis confirms validity of the first universality above room temperature. At low temperatures, although the conductivity was low, the frequency dependence of dielectric loss indicates no clear evidence of the nearly constant loss effect, so-called second universality. The bulk (intrinsic) dielectric properties, AC and DC conductivity of the RHSe crystal at frequencies up to 1 GHz are shown to be caused by the thermally activated proton hopping. The increase of the AC conductivity above 100 GHz could be assigned to the low-frequency wing of proton vibrational modes.

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Section: Scaling Of the Frequency Dependent Conductivitymentioning

confidence: 99%

Proton dynamics in superprotonic Rb₃H(SeO₄)₂ crystal by broadband dielectric spectroscopy

Ławniczak

Petzelt

Bovtun

et al. 2020

J. Phys.: Condens. Matter

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“…Baranov et al, 1982Baranov et al, , 1988Moskvich et al, 1985;Sinitsin et al, 1988;Norby et al, 1995;Otomo et al, 2003;Yoshida et al, 2004), M 3 H(AO 4 ) 2 (see e.g. Ramasastry & Ramaiah, 1981;Baranov et al, 1987;Pawłowski et al, 1990;Chen et al, 2000;Matsuo et al, 2004;Ławniczak et al, 2019), M 4 H 2 (AO 4 ) 3 (e.g. Pawlaczyk et al, 1986), M 5 H 3 (AO 4 ) 4 (Gaydamaka et al, 2019) and M 9 H 7 -(AO 4 ) 8 •H 2 O (Makarova et al, 2014), as well as solid solutions and composites based on them (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Features of the crystal structure and surface of superprotonic conductor caesium hydrogen sulfate phosphate

Makarova,

Isakova,

Kalyukanov

et al. 2024

Acta Crystallogr Sect B

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The crystal structure of superprotonic conductor caesium hydrogen sulfate phosphate [Cs4(HSO4)3(H2PO4)] have been analyzed using neutron diffraction methods. Additionally, its structure and surface layers have been investigated using atomic force microscopy. From the diffraction data obtained, Fourier syntheses of neutron scattering densities were calculated, and the localization of hydrogen atoms and the parameters of three types of hydrogen bonds in the crystal structure were accurately determined. Correlation of surface characteristics of samples obtained by atomic force microscopy with their crystal structure is shown.

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“…Baranov et al, 1982Baranov et al, , 1988Moskvich et al, 1985;Sinitsin et al, 1988;Norby et al, 1995;Otomo et al, 2003;Yoshida et al, 2004), M 3 H(AO 4 ) 2 (see e.g. Ramasastry & Ramaiah, 1981;Baranov et al, 1987;Pawlowski et al, 1990;Chen et al, 2000;Matsuo et al, 2004;Ławniczak et al, 2019), M 4 H 2 (AO 4 ) 3 (e.g. Pawlaczyk et al, 1986), M 5 H 3 (AO 4 ) 4 (Gaydamaka et al, 2019) and M 9 H 7 (AO 4 ) 8 ÁH 2 O (Makarova et al, 2014), as well as solid solutions and composites based on them (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Conductivity, its anisotropy and changes as a manifestation of the features of the atomic and real structures of superprotonic [K_1–x(NH₄)_x]₃H(SO₄)₂ crystals

Селезнева

Makarova

Гайнутдинов

et al. 2023

Acta Crystallogr Sect B

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Single crystals of [K1–x (NH4) x ]3H(SO4)2 (x ≥ 0.57) grown in the K3H(SO4)2–(NH4)3H(SO4)2–H2O water–salt system are studied. The atomic structure including H atoms was determined at room temperature using X-ray structural analysis. [K1–x (NH4) x ]3H(SO4)2 (x ≥ 0.57) crystals have trigonal symmetry and disordered hydrogen-bond networks at ambient conditions similar to the high-temperature phases of K3H(SO4)2, (NH4)3H(SO4)2 and other superprotonic compounds M 3H(AO4)2. Impedance measurements performed on single crystals show high values of conductivity characteristic for superprotonic phases. Using the methods of impedance spectroscopy and atomic force microscopy, a significant anisotropy of the conductivity of crystals has been detected. It was also shown that there is a qualitative correlation of bulk and local conductivity measured for samples of the same composition and orientation at room temperature, which is due to the peculiarities of their crystal structure.

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Uncommon first universality of conductivity in superprotonic (NH₄)₃H(SeO₄)₂ single crystals

Abstract: The proton conducting crystal (NH4)3H(SeO4)2 is examined to check whether the first universality of conductivity spectra is sensitive to subtle changes in the crystal structure and proton dynamics caused by external pressure.

Cited by 3 publications

References 31 publications

Proton dynamics in superprotonic Rb₃H(SeO₄)₂ crystal by broadband dielectric spectroscopy

Proton dynamics in superprotonic Rb₃H(SeO₄)₂ crystal by broadband dielectric spectroscopy

Features of the crystal structure and surface of superprotonic conductor caesium hydrogen sulfate phosphate

Conductivity, its anisotropy and changes as a manifestation of the features of the atomic and real structures of superprotonic [K_1–x(NH₄)_x]₃H(SO₄)₂ crystals

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Uncommon first universality of conductivity in superprotonic (NH4)3H(SeO4)2 single crystals

Abstract: The proton conducting crystal (NH4)3H(SeO4)2 is examined to check whether the first universality of conductivity spectra is sensitive to subtle changes in the crystal structure and proton dynamics caused by external pressure.

Cited by 3 publications

References 31 publications

Proton dynamics in superprotonic Rb3H(SeO4)2 crystal by broadband dielectric spectroscopy

Proton dynamics in superprotonic Rb3H(SeO4)2 crystal by broadband dielectric spectroscopy

Features of the crystal structure and surface of superprotonic conductor caesium hydrogen sulfate phosphate

Conductivity, its anisotropy and changes as a manifestation of the features of the atomic and real structures of superprotonic [K1–x (NH4) x ]3H(SO4)2 crystals

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Uncommon first universality of conductivity in superprotonic (NH₄)₃H(SeO₄)₂ single crystals

Proton dynamics in superprotonic Rb₃H(SeO₄)₂ crystal by broadband dielectric spectroscopy

Proton dynamics in superprotonic Rb₃H(SeO₄)₂ crystal by broadband dielectric spectroscopy

Conductivity, its anisotropy and changes as a manifestation of the features of the atomic and real structures of superprotonic [K_1–x(NH₄)_x]₃H(SO₄)₂ crystals