Phase transition of potassium sulfate, K2SO4 (II); dielectric constant and electrical conductivity

Michihiro Miyake, Mutsumi Matsuo, Mayumi Hata, Shin ichi Iwai

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The phase transition of K2SO4 has been investigated by measurements of the dielectric constant and electrical conductivity, correlated with the structural point of view. Using single crystals, the temperature dependences of the dielectric constants and electrical conductivities were measured at frequencies of 0.3, 1, 3, and 5 MHz in the temperature range from 20° to 640 °C. Within this range, the dielectric constant does not reach a maximum, but near the phase-transition temperature at 587° C, the dielectric constant along the c axis shows a larger discontinuity than those along the a and b axes. The temperature dependence of the dielectric constant is consistent with the disordered structure of the high temperature form. Based on the parabolic increase of the dielectric constant in the temperature range from 582° to 587° C, it is likely that the phase transition propagates through an intermediate state. The electrical conductivity coefficients of K2SO4 increase with increasing temperature, exhibiting semiconducting character above the phase-transition temperature. In the high-temperature form, the electrical conductivity along the a axis exceeds that along the c axis. Since the electrical conductivity of K2SO4 is mainly ionic in character, the migration of K+ ions makes a major contribution to the conduction process.

Original languageEnglish
Pages (from-to)88-90
Number of pages3
JournalPhysics and Chemistry of Minerals
Volume7
Issue number2
DOIs
Publication statusPublished - 1981
Externally publishedYes

Fingerprint

phase transition
electrical conductivity
Potassium
Permittivity
potassium
Phase transitions
sulfate
temperature
Temperature
Superconducting transition temperature
Electric Conductivity
Sulfates
potassium sulfate
discontinuity
Single crystals
Ions
crystal
ion

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

Cite this

Phase transition of potassium sulfate, K2SO4 (II); dielectric constant and electrical conductivity. / Miyake, Michihiro; Matsuo, Mutsumi; Hata, Mayumi; Iwai, Shin ichi.

In: Physics and Chemistry of Minerals, Vol. 7, No. 2, 1981, p. 88-90.

Research output: Contribution to journalArticle

Miyake, Michihiro ; Matsuo, Mutsumi ; Hata, Mayumi ; Iwai, Shin ichi. / Phase transition of potassium sulfate, K2SO4 (II); dielectric constant and electrical conductivity. In: Physics and Chemistry of Minerals. 1981 ; Vol. 7, No. 2. pp. 88-90.
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