Phase composition, thermal and transport properties of the system based on the mono- and dihydrogen phosphates of rubidium

Anna A. Gaydamaka; Valentina G. Ponomareva; Irina N. Bagryantseva

doi:10.1016/j.ssi.2018.12.005

Phase composition, thermal and transport properties of the system based on the mono- and dihydrogen phosphates of rubidium

Anna A. Gaydamaka, Valentina G. Ponomareva, Irina N. Bagryantseva

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Phase composition and phase transitions, spectral characteristics, thermal and transport properties of the (1-x)RbH₂PO₄ – xRb₂HPO₄ · yH₂O system at the wide range of х = 0–1 were investigated. No solid solutions were observed at the system. A monophasic region at х = 0.25 with the compound Rb₅H₇(PO₄)₄ was found. The thermodynamic and transport properties of Rb₅H₇(PO₄)₄ were studied in detail. The other compositions correspond to diphasic mixtures of two salts: RbH₂PO₄ and Rb₅H₇(PO₄)₄ (х = 0–0.2), or Rb₂HPO₄·yH₂O and Rb₅H₇(PO₄)₄ (at х higher 0.25). The sharp increase of proton conductivity up to 3·10⁻² S/cm under highly humidified conditions was found for х = 0.1–0.25 at temperatures >240 °С can be associated with the superionic phase transitions of RbH₂PO₄ and Rb₅H₇(PO₄)₄. A weak composite effect with a slight increase of conductivity (about one order of magnitude) at low temperatures compared to those for the pure salts RbH₂PO₄ and Rb₂HPO₄·2H₂O was shown for all samples.

Original language	English
Pages (from-to)	124-130
Number of pages	7
Journal	Solid State Ionics
Volume	329
DOIs	https://doi.org/10.1016/j.ssi.2018.12.005
Publication status	Published - 1 Jan 2019

Keywords

A60
ac-impedance spectroscopy
Dihydrophosphate of rubidium
Hydrophosphate of rubidium dihydrate
IR-spectroscopy
Proton conductivity
PROTON CONDUCTIVITY
HIGH-TEMPERATURE
CSH2PO4
SUPERPROTONIC CONDUCTIVITY
DEHYDRATION BEHAVIOR
RBH2PO4
BONDS
TRANSITIONS

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@article{f9c5e9e90ee14bbbaecba71a0e9b686a,

title = "Phase composition, thermal and transport properties of the system based on the mono- and dihydrogen phosphates of rubidium",

abstract = "Phase composition and phase transitions, spectral characteristics, thermal and transport properties of the (1-x)RbH2PO4 – xRb2HPO4 · yH2O system at the wide range of х = 0–1 were investigated. No solid solutions were observed at the system. A monophasic region at х = 0.25 with the compound Rb5H7(PO4)4 was found. The thermodynamic and transport properties of Rb5H7(PO4)4 were studied in detail. The other compositions correspond to diphasic mixtures of two salts: RbH2PO4 and Rb5H7(PO4)4 (х = 0–0.2), or Rb2HPO4·yH2O and Rb5H7(PO4)4 (at х higher 0.25). The sharp increase of proton conductivity up to 3·10−2 S/cm under highly humidified conditions was found for х = 0.1–0.25 at temperatures >240 °С can be associated with the superionic phase transitions of RbH2PO4 and Rb5H7(PO4)4. A weak composite effect with a slight increase of conductivity (about one order of magnitude) at low temperatures compared to those for the pure salts RbH2PO4 and Rb2HPO4·2H2O was shown for all samples.",

keywords = "A60, ac-impedance spectroscopy, Dihydrophosphate of rubidium, Hydrophosphate of rubidium dihydrate, IR-spectroscopy, Proton conductivity, PROTON CONDUCTIVITY, HIGH-TEMPERATURE, CSH2PO4, SUPERPROTONIC CONDUCTIVITY, DEHYDRATION BEHAVIOR, RBH2PO4, BONDS, TRANSITIONS",

author = "Gaydamaka, {Anna A.} and Ponomareva, {Valentina G.} and Bagryantseva, {Irina N.}",

year = "2019",

month = jan,

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doi = "10.1016/j.ssi.2018.12.005",

language = "English",

volume = "329",

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journal = "Solid State Ionics",

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TY - JOUR

T1 - Phase composition, thermal and transport properties of the system based on the mono- and dihydrogen phosphates of rubidium

AU - Gaydamaka, Anna A.

AU - Ponomareva, Valentina G.

AU - Bagryantseva, Irina N.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Phase composition and phase transitions, spectral characteristics, thermal and transport properties of the (1-x)RbH2PO4 – xRb2HPO4 · yH2O system at the wide range of х = 0–1 were investigated. No solid solutions were observed at the system. A monophasic region at х = 0.25 with the compound Rb5H7(PO4)4 was found. The thermodynamic and transport properties of Rb5H7(PO4)4 were studied in detail. The other compositions correspond to diphasic mixtures of two salts: RbH2PO4 and Rb5H7(PO4)4 (х = 0–0.2), or Rb2HPO4·yH2O and Rb5H7(PO4)4 (at х higher 0.25). The sharp increase of proton conductivity up to 3·10−2 S/cm under highly humidified conditions was found for х = 0.1–0.25 at temperatures >240 °С can be associated with the superionic phase transitions of RbH2PO4 and Rb5H7(PO4)4. A weak composite effect with a slight increase of conductivity (about one order of magnitude) at low temperatures compared to those for the pure salts RbH2PO4 and Rb2HPO4·2H2O was shown for all samples.

AB - Phase composition and phase transitions, spectral characteristics, thermal and transport properties of the (1-x)RbH2PO4 – xRb2HPO4 · yH2O system at the wide range of х = 0–1 were investigated. No solid solutions were observed at the system. A monophasic region at х = 0.25 with the compound Rb5H7(PO4)4 was found. The thermodynamic and transport properties of Rb5H7(PO4)4 were studied in detail. The other compositions correspond to diphasic mixtures of two salts: RbH2PO4 and Rb5H7(PO4)4 (х = 0–0.2), or Rb2HPO4·yH2O and Rb5H7(PO4)4 (at х higher 0.25). The sharp increase of proton conductivity up to 3·10−2 S/cm under highly humidified conditions was found for х = 0.1–0.25 at temperatures >240 °С can be associated with the superionic phase transitions of RbH2PO4 and Rb5H7(PO4)4. A weak composite effect with a slight increase of conductivity (about one order of magnitude) at low temperatures compared to those for the pure salts RbH2PO4 and Rb2HPO4·2H2O was shown for all samples.

KW - A60

KW - ac-impedance spectroscopy

KW - Dihydrophosphate of rubidium

KW - Hydrophosphate of rubidium dihydrate

KW - IR-spectroscopy

KW - Proton conductivity

KW - PROTON CONDUCTIVITY

KW - HIGH-TEMPERATURE

KW - CSH2PO4

KW - SUPERPROTONIC CONDUCTIVITY

KW - DEHYDRATION BEHAVIOR

KW - RBH2PO4

KW - BONDS

KW - TRANSITIONS

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U2 - 10.1016/j.ssi.2018.12.005

DO - 10.1016/j.ssi.2018.12.005

M3 - Article

AN - SCOPUS:85057726903

VL - 329

SP - 124

EP - 130

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -