METHOD FOR STUDYING ELECTROLYTIC PROPERTIES OF MATERIALS WITH MIXED TYPE OF CONDUCTIVITY AT LOW TEMPERATURES AND UNIT FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC G01N27/417 G01R31/00 

FIELD: measurement equipment.

SUBSTANCE: sample under study is placed between the platinum grids-current collectors of the measuring cell used in electrochemical impedance spectroscopy, the alundum tube is heated to 550°C followed by cooling in 50°C steps to 400°C. Composition of the gas atmosphere inside the alundum tube is regulated by changing the atmosphere to dry or wet, impedance spectra are obtained at each temperature separately in dry or humid atmospheres, from the data obtained the total electrical conductivity is determined and then divided into components, differs in that the composition of the gas atmosphere inside the alundum tube is additionally regulated by changing the partial oxygen content in it from 10^–22 to 0.24 atm in increments of log pO₂ = 0.5 using an additional electrochemical cell connected to a microprocessor controller, equipped with an electrochemical oxygen pump and an oxygen partial pressure sensor, placed in an alundum tube located inside a high-temperature furnace, which is heated to 800°C, after which the sample is kept isothermally at each temperature and partial pressure of oxygen for 1 hour, impedance spectra are obtained at each temperature and log pO₂ value separately in dry or humid atmospheres, from the obtained data the volumetric and grain-boundary, as well as electronic, ionic and hole components of the total electrical conductivity.

EFFECT: providing the ability to study the electrolytic properties of materials with a mixed type of conductivity under operating conditions of electrochemical devices close to operational ones, including a wide range of oxygen partial pressure, temperatures below 600°C, dry or wet gas atmosphere.

2 cl, 6 dwg