TY - JOUR

T1 - Proton conductivity of borate glass of the Me2O-B 2O3 (Me = Na, Ag, Tl) system

AU - Sokolov, I. A.

AU - Murin, I. V.

AU - Startsev, Yu K.

AU - Pronkin, A. A.

PY - 2011/5

Y1 - 2011/5

N2 - The temperature-concentration dependences of glass conductivity in the Na2O-B2O3, Ag2O-B2O 3, and Tl2O-B2O3 systems are studied. The nature of charge carriers in glass of these systems is revealed experimentally and their dependence on the concentration is studied. Based on the methods of Hittorf, Tubandt, Hebb-Liang-Wagner, and also on the fulfillment of Faraday's Laws, it is shown that in glass of the Na2O-B 2O3 system with [Na2O] < 15 mol %, the protons take part in the transport of charge in addition to sodium ions. The unipolar sodium conduction is attained at [Na2O] > 17 mol %. In glass of the Ag2O-B2O3 system, the conduction is associated with the migration of both silver ions and protons. For Ag 2O concentrations from 15 to 22.5 mol %, the transport numbers of silver ions vary in a range from 0.45 to 0.53 and are virtually independent of the Ag2O content. In glass of the Tl2O-B2O 3 system, the charge transfer is performed exclusively by protons. The contribution of the electronic component into the conductivity of glass in the systems studied does not exceed 0.01%. An interpretation of the temperature-concentration dependences of conductivity is put forward.

AB - The temperature-concentration dependences of glass conductivity in the Na2O-B2O3, Ag2O-B2O 3, and Tl2O-B2O3 systems are studied. The nature of charge carriers in glass of these systems is revealed experimentally and their dependence on the concentration is studied. Based on the methods of Hittorf, Tubandt, Hebb-Liang-Wagner, and also on the fulfillment of Faraday's Laws, it is shown that in glass of the Na2O-B 2O3 system with [Na2O] < 15 mol %, the protons take part in the transport of charge in addition to sodium ions. The unipolar sodium conduction is attained at [Na2O] > 17 mol %. In glass of the Ag2O-B2O3 system, the conduction is associated with the migration of both silver ions and protons. For Ag 2O concentrations from 15 to 22.5 mol %, the transport numbers of silver ions vary in a range from 0.45 to 0.53 and are virtually independent of the Ag2O content. In glass of the Tl2O-B2O 3 system, the charge transfer is performed exclusively by protons. The contribution of the electronic component into the conductivity of glass in the systems studied does not exceed 0.01%. An interpretation of the temperature-concentration dependences of conductivity is put forward.

KW - electric conductivity

KW - electrolysis

KW - solid state ionics

KW - the nature of charge carriers

KW - transport numbers

KW - vitreous solid electrolytes

UR - http://www.scopus.com/inward/record.url?scp=79958141621&partnerID=8YFLogxK

U2 - 10.1134/S1023193511040161

DO - 10.1134/S1023193511040161

M3 - Article

VL - 47

SP - 537

EP - 546

JO - Russian Journal of Electrochemistry

JF - Russian Journal of Electrochemistry

SN - 1023-1935

IS - 5

ER -