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Shikanai, Fumihito; Tsukada, Shinya; Kano, Jun; Kojima, Seiji

doi:10.1103/physrevb.81.012301

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…1. The energy absorbed by the substance would be used in phase I to distribute the protons over the unit cell, propitiating the proton diffusion [9,26]. additionally, the samples had the same physical characteristics (size, mass and morphology).…”

Section: Resultsmentioning

confidence: 99%

Phase behaviour and superionic phase transition in K3H(SeO4)2

Hernández-Daguer

Correa

Vargas

2015

Ionics

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The phase behaviour of K 3 H(SeO 4 ) 2 (TKHSe) above room temperature has been studied by differential scanning calorimetric (DSC), thermogravimetric analysis (TGA), simultaneous thermogravimetric and mass spectroscopy analysis (TG-MS), impedance spectroscopy (IS) and X-ray powder diffraction (XRD). Our results show that the previously claimed superionic phase transition in TKHSe at around 388 K (114.85°C) is also the onset temperature of a slow thermal dehydration that occurs at reaction sites distributed over the surface of the crystal. That is, we propose that the TKHSe undergoes simultaneously a superionic phase transition and a decomposition process with a very slow reaction rate that is evident when the sample is pulverized to fine powder, both starting at the same temperature. As a matter of fact, we observe a decrease of the magnitude of the dcconductivity on successive thermal runs in powdered sample attributed to sample decomposition that starts at the surface of the TKHSe grains, but the jump in conductivity is only a consequence of the order-disorder transition in the TKHSe phase that remains inside the grains.

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Section: Resultsmentioning

confidence: 99%

Phase behaviour and superionic phase transition in K3H(SeO4)2

Hernández-Daguer

Correa

Vargas

2015

Ionics

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“…etc., possess high proton conductivity and have been broadly reported to have a superionic phase transition above 112 • C [42][43][44][45][46], encouraging the design of fuel cells that operate at temperatures above the normal boiling point of water. However, some inconsistencies have been found in the thermal and electrical behavior of members of the M 3 X(AO 4 ) 2 family [44,[47][48][49][50] and other families mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…However, some inconsistencies have been found in the thermal and electrical behavior of members of the M 3 X(AO 4 ) 2 family [44,[47][48][49][50] and other families mentioned above. Due to these inconsistencies, different physical and chemical points of view have attempted to explain the process that produces the fast ion conduction in M 3 X(AO 4 ) 2 acid salts [42,43,46,49,[51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70], as is the case of K 3 H(SeO 4 ) 2 (abbreviated as TKHSe). The superionic phase transition in TKHSe has been observed around T p (114 • C) by performing thermal and electrical studies under different experimental tests and conditions.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure Elucidation of the Novel Molecular-Inorganic Polymer $\mathrm{K_{2}SeO_{4}\cdot H_{2}SeO_{3}}$

Hernández-Daguer,

Barnes,

Hernández-Rivera

et al. 2019

Preprint

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The orthorhombic crystal structure of the novel molecular-inorganic polymer K 2 SeO 4 • H 2 SeO 3 was elucidated using single-crystal X-ray diffraction with MoKα radiation (λ= 0.71073 Å), performed at 100 and 298.15 K. The reported data is at 100 K since there were no structural differences as compared to the room temperature. The technique revealed K 2 SeO 4 •H 2 SeO 3 crystals to have space group P bcm with unit cell dimensions a = 8.8672(17) Å, b = 7.3355(14) Å, c = 11.999(2) Å and Z = 4. The unit cell volume obtained was V = 780.5(3) Å 3 with a calculated density D c = 2.980M g/m 3 . In K 2 SeO 4 • H 2 SeO 3 , the selenate anions and selenous acid molecules form an infinite polymeric chain along the c axis, through strong hydrogen bonds. That

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“…Conversely, Brillouin scattering spectroscopy is able to take the sound velocity measurement with no specimen contact and in a non-destructive manner [7][8][9][10][11][12][13][14][15][16]. Brillouin spectroscopy is almost the only method able to effectively measure the sound velocity in the specimen at high temperature [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Rotational relaxation in diatomic gas at high temperature observed with Brillouin scattering spectroscopy

Minami¹,

Yogi²,

Sakai³

2011

J. Opt.

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It has recently become possible to observe Brillouin scattering spectra of gases at high temperatures as well as their rotational–translational (R–T) relaxation at room temperatures with optical beating Brillouin scattering spectroscopy. In this study, the sound velocity in nitrogen gas was measured at high temperature and a R–T relaxation in the frequency region of 100 MHz was observed. The obtained relaxation frequency value was found to be experimentally reasonable when compared to theoretical values. To our knowledge, optical beating Brillouin spectroscopy is the only method used to observe the total change in sound velocity in R–T relaxation at high temperature. Employing the spectroscopy allowed for a discussion of the temperature and frequency dependence on mechanical properties such as the specific ratio; that is, the internal energy degrees of freedom of the molecules.

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Acoustic phonons and a central mode in the protonic conductorK3H(SeO4)2

Cited by 5 publications

References 21 publications

Phase behaviour and superionic phase transition in K3H(SeO4)2

Phase behaviour and superionic phase transition in K3H(SeO4)2

Crystal Structure Elucidation of the Novel Molecular-Inorganic Polymer $\mathrm{K_{2}SeO_{4}\cdot H_{2}SeO_{3}}$

Rotational relaxation in diatomic gas at high temperature observed with Brillouin scattering spectroscopy

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