Electrical and thermal properties of Na₂SO₄ doped with NaVO₃, Ln₂(SO₄)₃ (Ln = Eu, Pr)

Abstract

In order to develop useful solid electrolytes for SO2 detectors, Na2SO4, Na2SO4–Eu2(SO4)3, Na2SO4–NaVO3, and Na2SO4–NaVO3–Ln2(SO4)3 (Ln = Eu, Pr) systems have been prepared, and their electrical and thermal properties have been measured. By doping Na2SO4 with Eu2(SO4)3, the electrical conductivity increases and the apparent activation energy of the Na2SO4–Eu2(SO4)3 system shows a value between those of Na2SO4-III and Na2SO4-I. Addition of NaVO3 and Ln2(SO4)3 (Ln = Eu, Pr) to Na2SO4 suppressed the phase transformation, by stabilizing the structure of the Na2SO4-I phase even at a relatively low temperature.

The Electrical and Thermal Properties of Sodium Sulfate Mixed with Lithium Sulfate, Yttrium Sulfate, and Silicon Dioxide

“…Electrical conductivities of alkali-metal sulfates are fairly low in comparison with other cationic conductors, such as fl-alumina (13), NASICON (14,15), and LISICON (16). Enhancement of the conductivity has been tried by doping the sulfates with mono-, di-, or trivalent cations (17)(18)(19)(20)(21)(22).…”