TY - JOUR

T1 - Electrophysical Properties of BeO + 30 wt.% TiO2 Ceramics Sintered at Elevated Temperatures

AU - Drokin, N. A.

AU - Kiiko, V. S.

AU - Malkin, A. I.

AU - Pavlov, A. V.

PY - 2022/9/1

Y1 - 2022/9/1

N2 - The electrophysical properties of BeO-based ceramics with introduced micro- and nanoparticles of TiO2 were investigated by impedance spectroscopy in the frequency range of 100 Hz – 100 MHz. In order to increase the density and conductivity, the initial ceramic components were sintered at the highest possible temperatures up to 1660°C, followed by annealing in hydrogen at 800°C. In this case, TiO2 was strongly reduced with the formation of lower titanium oxides (Ti3O5) along with metallic titanium. When interacting with hydrogen, TiH2 is formed. For the first time, impurity phases were found in (BeO + TiO2) ceramics, which can significantly alter its bulk and surface properties. The resulting ceramics has a high reach-through conductivity, which increases significantly after an additional thermal annealing in hydrogen. It was established that the activation energy of conductivity does not depend much on the concentration of TiO2 nanoparticles and decreases significantly in the low-temperature region. The method of constructing equivalent electrical circuits was used to simulate the passage of the active and reactive components of the current through the complex internal structure of the ceramics.

AB - The electrophysical properties of BeO-based ceramics with introduced micro- and nanoparticles of TiO2 were investigated by impedance spectroscopy in the frequency range of 100 Hz – 100 MHz. In order to increase the density and conductivity, the initial ceramic components were sintered at the highest possible temperatures up to 1660°C, followed by annealing in hydrogen at 800°C. In this case, TiO2 was strongly reduced with the formation of lower titanium oxides (Ti3O5) along with metallic titanium. When interacting with hydrogen, TiH2 is formed. For the first time, impurity phases were found in (BeO + TiO2) ceramics, which can significantly alter its bulk and surface properties. The resulting ceramics has a high reach-through conductivity, which increases significantly after an additional thermal annealing in hydrogen. It was established that the activation energy of conductivity does not depend much on the concentration of TiO2 nanoparticles and decreases significantly in the low-temperature region. The method of constructing equivalent electrical circuits was used to simulate the passage of the active and reactive components of the current through the complex internal structure of the ceramics.

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85144595232

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000903405300001

UR - https://elibrary.ru/item.asp?id=53726770

U2 - 10.1007/s11148-022-00728-3

DO - 10.1007/s11148-022-00728-3

M3 - Article

VL - 63

SP - 315

EP - 320

JO - Refractories and Industrial Ceramics

JF - Refractories and Industrial Ceramics

SN - 1083-4877

IS - 3

ER -