Influence of AC fields and electrical conduction mechanisms on the flash-onset temperature: Electronic (BiFeO3) vs. ionic conductors (8YSZ)
Sandra Molina-Molina a, Antonio Perej´on a,b,**, Luis A. P´erez-Maqueda a,***, Pedro E. S´anchez-Jim´enez a,b,*
- a
- Instituto
de Ciencia de Materiales de Sevilla, Consejo Superior de
Investigaciones Científicas-Universidad de Sevilla, Calle Américo
Vespucio 49, Sevilla, 41092, Spain
- b
- Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Sevilla, 41012, Spain
Received
27 February 2022, Revised 21 June 2022, Accepted 22 June 2022,
Available online 1 July 2022, Version of Record 22 March 2023.
Abstract
This
work aims to clarify the influence of AC (up to 50 kHz) vs DC fields on
the flash-onset temperature, emphasizing the role of the electrical
conduction mechanism. BiFeO
3 (BFO) is used as an example of electronic conductor while 8-mol % Yttria-stabilized zirconia (8YSZ) is used as an example of ionic conductor.
For 8YSZ, a frequency dependence of the flash-onset temperature and
flash-induced heating is observed. This is consistent with the different
contributions found in the total electrical response of 8YSZ as
characterized by impedance spectroscopy measurements. Estimations based on the blackbody radiation
model suggest that 8YSZ samples attain higher temperatures under AC
fields due to a more efficient heating. Moreover, a noticeable decrease
in the activation energy
for the electrical conduction after the flash is triggered is
attributed to electronic conduction. Meanwhile, the lack of frequency
response and insensitiveness to the type of electrical field found in
the case of BFO can be attributed to its mainly electronic bulk
conduction.
Комментариев нет:
Отправить комментарий