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

Abstract

Articles you may be interested inElectric-field-temperature phase diagram of the ferroelectric relaxor system (1−x)Bi1/2Na1/2TiO3−xBaTiO3 doped with manganese J. Appl. Phys. 115, 194104 (2014) . Temperature-dependent permittivity e 0 (T) and thermally stimulated depolarization currents (TSDC) of poled samples were measured under identical heating conditions to clarify the depolarization mechanism. In both methods, the influence of electric bias fields on the transition temperature was investigated. Fields applied in the poling direction shift the transition to higher temperatures, with corresponding results in e 0 (T) and TSDC measurements. While the response of transition temperature to external fields displays a similar trend in all investigated compositions, the shape of TSDC is clearly connected with the composition and, hence, the crystal symmetry of the sample. Furthermore, the comparison of e 0 (T) and TSDC data reveals a systematic shift between transition temperatures obtained with the two different methods.;

The effects of Ba2+ content on depolarization temperature and pyroelectric properties of lead-free 0.94Na0.5Bi0.5TiO3–0.06Ba1+xTiO3 ceramics

“…However, there are other definitions of T d such as the steep reduction of remnant polarization [7], or the phase transition temperature from ferroelectric (FE) to anti-ferroelectric (AFE) or to relaxor anti-ferroelectric or to relaxor [8,[22][23][24][25]. In this study, T d was identified from the measurement of the dielectric loss (tand) versus temperature.…”

Frequency-dependence of large-signal properties in lead-free piezoceramics

“…47 This was ascertained using further field dependence together with temperature dependence of permittivity and depolarization current. 48 Here, we are fundamentally interested in ferroelectric-relaxor transitions and determine the peak in tand in order to quantify the ferroelectric-relaxor transition (T F-R ). 31,48 This temperature decreases with increasing Zn 2þ -content from 55 C in 2BZT to 45 C in 3BZT.…”

“…48 Here, we are fundamentally interested in ferroelectric-relaxor transitions and determine the peak in tand in order to quantify the ferroelectric-relaxor transition (T F-R ). 31,48 This temperature decreases with increasing Zn 2þ -content from 55 C in 2BZT to 45 C in 3BZT. Eventually, no transition is observed for 4BZT above 25 C. The general trend suggests that the ferroelectric-relaxor transition lies below room temperature.…”

The influence of Mn substitution on the local structure of Na0.5Bi0.5TiO3 crystals: Increased ferroelectric ordering and coexisting octahedral tilts

“…2 Furthermore, recent investigations of Na 1/2 Bi 1/2 TiO 3 -xat.%BaTiO 3 (NBT-x%BT) have revealed giant strain and longitudinal piezoelectric constants as high as d 33 ¼ 500 pC/N for compositions near a morphotropic phase boundary (MPB) around x ¼ 5.5-6.5. [3][4][5][6][7][8][9][10][11][12][13] In spite of a non-rhombohedral average structure model for NBT at room temperature was supported by highresolution single-crystal x ray diffraction, 14 it is still widely accepted that NBT undergoes a phase transformational sequence of paraelectric cubic (C) ! paraelectric tetragonal (T) !…”