SU1075138A1 - Solid electrolyte - Google Patents

Abstract

SOLID ELECTROLYTE containing alkaline earth metal sulfide and rare earth metal sulfide, characterized in that, in order to expand the operating temperature range, barium sulfide is used as the alkaline earth metal sulfide, and quantitative ratio, wt.%: BaS25-55 Else

Description

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The invention relates to electrochemical studies of semiconductor compounds and can be used to study crystalline and amorphous semiconductor sulfides using the EMF method, in gas analyzers for sulfur-containing gases, in current sources

Known solid electrolyte with the prevailing sulfidanionic conductivity p / j, containing barium sulfide and zirconium disulfide in the following amounts, mol. %:

30 70

BaS ZrSfi

The disadvantages of this solid electrolyte are low ion transfer numbers and a narrow range of operating temperatures.

The closest to the technical essence of the invention is a solid electrolyte containing an alkaline earth metal sulphide and earth metal sulphide 2j. ,

. A disadvantage of the known solid electrolyte is that it can be used in a narrow temperature range of the ZSG-380 s, which limits its use to study various sulphide materials.

The aim of the invention is to expand the operating temperature range.

The goal is achieved by the fact that in a solid electrolyte containing alkaline earth metal sulfide and rare earth metal sulfide, barium sulfide is used as alkaline earth metal sulfide, and barium sulfide is used as alkaline earth metal sulfide, as a rare earth metal sulfide, one-and-a-half thulium sulfide in the following quantitative ratios, mol "% S

25-55

BaS Else

The quantitative ratios of this solid electrolyte are due to the state diagram obtained on the basis of the data of three methods: electrical conductivity, X-ray diffraction analysis, homogenizing annealing. The dependences of the specific electrical conductivity, relative displacement (Bragg reflection angle, and relative linear shrinkage on the composition, mol.% Ba) were recorded.

The drawing shows a state diagram of a given solid electrolyte.

All three dependences have an identical character: the composition – property dependence is observed, which is characteristic for the formation of solid solutions. Beyond the limits of this area, all three properties are practically independent of the composition, which is inherent in two phase o6p.ci3uaM. The maximum values of Igjf, - and characterize disordering in the solid solutions given in the proposed diagram, p. the formation of sulfur ion vacancies, which are a source of sulfide ion conductivity. The minimum of properties corresponds to the BaTm2S4 compound, in which conductivity is possible due to disordering according to the following, type

X

& aTvn, 54: ±: ..

... 2e0 The use of a qualitatively new composition of BaS - in comparison with the known one extends the range of operating temperatures of the solid electrolyte.

5 In table. 1 shows the ion transfer numbers of the proposed electrolyte and known in the first operating temperature range. The proposed solid electrolyte, as well as known, contains sulfide. alkaline earth metal and rare earth sulphide, the introduction of TffljS / having a larger amount of free f-electrons as the second component increases the electrical conductivity of the samples, which is an important characteristic of solid electrolytes, since it reduces the resistance of electroplating cells in the following table. 2 shows the order of magnitude of the resistance of the proposed solid electrolyte and known. In tab. 3 compares temperature-: 15 Composition of electrolyte samples mol.% 40-57 BaS - 60-43 ZrSg 30-51 CaS - 70-49 25-55 BaS 75-45

The efficiency of use of the image can be determined by expanding the field of use by solid electrolytes with preferential sulfide ion conductivity for studying a wider range of

semiconductor sulfides using the EMF method, as well as the expansion of the use of solid electrolyte in gas analyzers to sulfur-containing gases to improve occupational health and safety. interval of possible use of solid electrolytes. Tables 2., - j System (and + E6) ohm cm VAZ - 10 - s CaS La, Si 10 - lo BaS - Tm Sa 1 (G - 10 ... T a-b of person 3, Temperature range of use, C 125-220 300-380 350-550

Claims (1)

SOLID ELECTROLYTE, containing alkaline earth metal sulfide and rare earth metal sulfide, characterized in that, in order to expand the operating temperature range, c. about the quality of alkaline earth metal sulfide use barium sulfide, and as a rare earth metal sulfide - one and a half sulphide of thulium in the following quantitative ratio, wt.%: BaS 25-55 Rest TT _g Sj (* * ·σ)