Effects of Mn-doping on TSDC and degradation of BaTiO3

Abstract

The effects of Mn-doping on TSDC (Thermally Stimulated Depolarization Current) and electrical degradation of BaTiO 3 have been investigated. TSDCs of undoped BaTiO 3 and Ba(Ti 1−x Mn x )O 3−δ exhibited the three sharp TSDC peaks around phase transition temperatures. TSDC of Ba(Ti 0.995 Mg 0.005 )O 2.995 increased gradually from 50 • C and this anomalous depolarization current kept going up well above the Curie temperature (∼130 • C). TSDCs of un-doped BaTiO 3 and Ba(Ti 0.995 Mn 0.005 )O 3−δ decreased in the temperature range above the Curie point, whereas a slight increase in TSDC was confirmed at the specimen of Ba(Ti 0.99 Mn 0.01 )O 3−δ . TSDCs of Ba(Ti 0.995−y Mg 0.005 Mn y )O 3−δ (y = 0.005, 0.01) were lower than that of Ba(Ti 0.995 Mg 0.005 )O 2.995 .

Influence of electric fields on the depolarization temperature of Mn-doped (1-x)Bi1/2Na1/2TiO3-xBaTiO3

“…33 In contrast to permittivity measurements, the TSDC method 31,32,[34][35][36] is able to detect depolarization directly by measuring resulting currents.…”

Dielectric response and thermally stimulated depolarization current analysis of BaNd1.76Bi0.24Ti5O14 high-temperature microwave capacitors

“…Meanwhile, the activation energy values of peak B are in the range of 0.64-0.76 eV and the average value is 0.71 eV. According to the movement of relaxation peaks and the activation energy value, it can be concluded that the relaxation peak B should be generated by oxygen vacancies (V O ) [16][17][18][19][20][21][22]. By comparing the activation energies of peak A and peak B, it can be concluded that peak A shows the higher value than peak B.…”

“…10b that the V O relaxation shows a long relaxation time in the range of 160-930 ls and an increase tendency with TSDC peak density, which is correlated with the migration of the polarized oxygen vacancies in dielectrics. The oxygen vacancies are depleted in the anodic region and piled-up in the cathodic region after polarization [16][17][18][19][20][21][22]. Under the suitable polarization conditions, some oxygen vacancies can migrate across the grain boundaries into adjacent grains.…”

“…[16][17][18][19][20][21][22][23][24]. TSDC may also be used to evaluate the activation energy of relaxation, relaxation time and the defect concentration, which enables a better understanding of the physical phenomena related to such defects [10,11,[15][16][17][18].…”

“…TSDC may also be used to evaluate the activation energy of relaxation, relaxation time and the defect concentration, which enables a better understanding of the physical phenomena related to such defects [10,11,[15][16][17][18]. TSDC is frequently used to analyze polymer materials; however, TSDC is yet to be extensively employed on microwave dielectrics [16][17][18][19][20][21][22][23][24]. The measurement of TSDC spectra is briefly described as follows [17][18][19][20].…”