Phases, phase transitions and excitons of the superionic conductor Cu<sub>2</sub>HgI<sub>4</sub>, from 4.2 K to 373 K, as revealed by the Kubelka-Munk spectral function

Paić, M.; Paić, Valerija

doi:10.1080/01411599608207835

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2000

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“…Details of both devices can be found elsewhere [26]. However, the structural behaviour of both compounds below ∼250 K is reported to be extremely complex, with reports of numerous phase transitions [27,28] and data were not collected below this temperature. A PC controlled Solartron S1260 Frequency Response Analyser determined the conventional Z-Z impedance plot over the frequency range from 0.1 Hz to 10 MHz.…”

Section: Methodsmentioning

confidence: 99%

Structural characterization of thebetatoalphasuperionic transition in Ag₂HgI₄and Cu₂HgI₄

Hull¹,

Keen²

2000

J. Phys.: Condens. Matter

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The nature of the superionic transition in Ag2 HgI4 and Cu2 HgI4 has been investigated using temper dependent powder neutron diffraction and impedance spectroscopy techniques. In the case of Ag2 HgI4 , the superionic transition occurs at Tc = 326(2) K and is accompanied by a 50-fold increase in the ionic conductivity. In the Cu+ analogue, which has a lower conductivity for a given temperature, the corresponding values are Tc = 338(4) K and / ~ 6. The ambient temperature crystal structures of the two compounds are different (space group I for -Ag2 HgI4 and I 2m for -Cu2 HgI4 ) but, in contrast to the most recent study, the high temperature polymorphs are found to be isostructural (space group F 3m ). Possible explanations for the different behaviour of the ionic conductivity of the two compounds are given.

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Section: Methodsmentioning

confidence: 99%

Structural characterization of thebetatoalphasuperionic transition in Ag₂HgI₄and Cu₂HgI₄

Hull¹,

Keen²

2000

J. Phys.: Condens. Matter

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Phases, phase transitions and excitons of the superionic conductor Cu₂HgI₄, from 4.2 K to 373 K, as revealed by the Kubelka-Munk spectral function

Cited by 1 publication

References 23 publications

Structural characterization of thebetatoalphasuperionic transition in Ag₂HgI₄and Cu₂HgI₄

Structural characterization of thebetatoalphasuperionic transition in Ag₂HgI₄and Cu₂HgI₄

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Phases, phase transitions and excitons of the superionic conductor Cu2HgI4, from 4.2 K to 373 K, as revealed by the Kubelka-Munk spectral function

Cited by 1 publication

References 23 publications

Structural characterization of thebetatoalphasuperionic transition in Ag2HgI4and Cu2HgI4

Structural characterization of thebetatoalphasuperionic transition in Ag2HgI4and Cu2HgI4

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Phases, phase transitions and excitons of the superionic conductor Cu₂HgI₄, from 4.2 K to 373 K, as revealed by the Kubelka-Munk spectral function

Structural characterization of thebetatoalphasuperionic transition in Ag₂HgI₄and Cu₂HgI₄

Structural characterization of thebetatoalphasuperionic transition in Ag₂HgI₄and Cu₂HgI₄