TY - JOUR

T1 - Optical and electrical properties of a new complex oxide Pb1 / 3Na1 / 3K1 / 3Ta2 / 3Fe1 / 3O3-δ with perovskite structure

AU - Zhuk, Nadezhda

AU - Popov, Alexey

AU - Korolev, Roman

AU - Moroz, Viktor

AU - Selyutin, Artem

AU - Koroleva, Alexandra

AU - Sekushin, Nikolay

AU - Makeev, Boris

PY - 2022/12/1

Y1 - 2022/12/1

N2 - A cubic perovskite of complex composition Pb 1 / 3 Na 1 / 3 K 1 / 3 Ta 2 / 3 Fe 1 / 3 O 3−δ (sp. gr. Pm-3m, a = 3.9767(3) Å) was synthesized for the first time by the solid-phase reaction method. The samples are characterized by an almost pore-free microstructure formed by slightly melted randomly oriented cubic crystallites. The band gap (≈2.05 eV) of a complex perovskite for a direct allowed electronic transition was calculated from the data of the diffuse reflection spectrum. According to impedance spectroscopy data, three polarization processes are observed in the sample at room temperature: low-frequency (at a frequency less than 300 Hz), medium-frequency (from 300 Hz to 10 kHz), and high-frequency (from 100 kHz to 10 MHz) ones. The permittivity of the sample at room temperature and a frequency of 10 7 Hz reaches high values of about 147, and the dielectric loss tangent does not exceed 0.12.

AB - A cubic perovskite of complex composition Pb 1 / 3 Na 1 / 3 K 1 / 3 Ta 2 / 3 Fe 1 / 3 O 3−δ (sp. gr. Pm-3m, a = 3.9767(3) Å) was synthesized for the first time by the solid-phase reaction method. The samples are characterized by an almost pore-free microstructure formed by slightly melted randomly oriented cubic crystallites. The band gap (≈2.05 eV) of a complex perovskite for a direct allowed electronic transition was calculated from the data of the diffuse reflection spectrum. According to impedance spectroscopy data, three polarization processes are observed in the sample at room temperature: low-frequency (at a frequency less than 300 Hz), medium-frequency (from 300 Hz to 10 kHz), and high-frequency (from 100 kHz to 10 MHz) ones. The permittivity of the sample at room temperature and a frequency of 10 7 Hz reaches high values of about 147, and the dielectric loss tangent does not exceed 0.12.

KW - dielectric properties

KW - diffuse reflection spectru

KW - iron

KW - lead

KW - optical properties

KW - perovskite

UR - http://www.scopus.com/inward/record.url?scp=85143829386&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/fa40fa79-656b-3e25-bf71-c5e2f45867b6/

U2 - 10.22226/2410-3535-2022-4-367-372

DO - 10.22226/2410-3535-2022-4-367-372

M3 - Article

VL - 12

SP - 367

EP - 372

JO - Letters on Materials

JF - Letters on Materials

SN - 2218-5046

IS - 4

ER -