P-T phase diagram of CsHSO4. Neutron scattering study of structure and dynamics

Belushkin, Α. V.; Adams, Mark A.; Hull, S.; Shuvalov, L. A.

doi:10.1016/0167-2738(94)00254-p

Cited by 38 publications

(34 citation statements)

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“…The indicated phase boundaries are more conforming to recent experimental results of [10,36,37] rather than to results of [4]. Phase IV is stable at 1.25 GPa and room temperature [36], phase II is stable in the range 0.75-1.1 GPa [37]. It should be noted here that in situ determinations of phases are highly needed for the interpretation of electrical conductivity measurements at high pressure..…”

Section: Discussionsupporting

confidence: 64%

“…The interpretations of kinks in slopes of ln(σxT) vs. 1/T were made on the basis of the previous experimental phase diagram [4]. The indicated phase boundaries are more conforming to recent experimental results of [10,36,37] rather than to results of [4]. Phase IV is stable at 1.25 GPa and room temperature [36], phase II is stable in the range 0.75-1.1 GPa [37].…”

Section: Discussionmentioning

confidence: 66%

“…In [23,35] the irreversible transformation of phase II into III (or IV) at 0.75-1.1 GPa has been explained due to the pressure stabilization effect of the phase II structure. At 1.25 GPa phase II transforms into phase IV [36]. Under cooling the domain size of phase II, which is transformed from phase I, is small, and this causes a kinetic delay of the phase II into low temperature phase.…”

Section: Discussionmentioning

confidence: 99%

“…Phase VI is the intermediate superprotonic phase with Pnma symmetry [36] has been observed in this study at P>1.5 GPa possessing the activation energy of electrical conductivity E σ ~1.4 eV ( Table 3) Table 3 Activation energies from IS measurements at P>1 GPa. At 2.5 GPa the phase which exists at room temperature is different from that at 2.0 GPa.…”

Section: Discussionmentioning

confidence: 99%

“…Phase V observed at room temperature at P>1.4 GPa is monoclinic P2 1 /m or P2 1 [36], and in the present experiments appeared at 1.5 GPa having the activation energy of electrical conductivity E σ ~0.63 eV. Phase VI is the intermediate superprotonic phase with Pnma symmetry [36] has been observed in this study at P>1.5 GPa possessing the activation energy of electrical conductivity E σ ~1.4 eV ( Table 3) Table 3 Activation energies from IS measurements at P>1 GPa.…”

Section: Discussionmentioning

confidence: 99%

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Phase transitions in CsHSO4 up to 2.5GPa: Impedance spectroscopy under pressure

Bagdassarov

2011

Journal of Physics and Chemistry of Solids

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Phase transitions in CsHSO 4 at pressures up to 2.5 GPa have been studied with the help of electrical impedance measurements. The phase boundaries have been identified with the help of calculated activation energies of electrical conductivity and dielectric relaxation time. The derived temperatures of phase transition from the low conductive phase II into super ionic phase I at pressure less than 1 GPa confirm the previous results of Ponyatovskiy et al. (1985) and . The phase diagram derived in this study for pressure larger than 1 GPa differs from the data of Ponyatovskiy et al. (1985). The phase transitions IV-VI and VI-I occur at higher temperatures having significantly larger Clapeyron slope. The phase VII was not identified from heating cycle and appears only under cooling between phase I and phase VI. The phase VIII was detected at 2.5 GPa at T< 350K and only during heating cycle.

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