Piezoelectric and Ferroelectric Properties of Bismuth Tungstate Ceramics Fabricated by Spark Plasma Sintering

Abstract

Single‐phase bismuth tungstate (Bi2WO6) ceramics with high relative density (>99%) were fabricated by spark plasma sintering. Ferroelectric, dielectric, and piezoelectric properties of Bi2WO6 ceramics were investigated. Almost saturated polarization–electric field (P–E) hysteresis loops with a remanent polarization (Pr) of ∼16.1 μC/cm2 and a coercive field (Ec) of ∼3.7 kV/mm were obtained. Curie point and second phase transition temperatures were observed at 937°±5° and 665°±5°C, respectively. The average piezoelectric constant (d33) of this high Curie point ceramic is 15±0.2 pCN−1.

The Application of Bismuth‐Based Oxides in Organic‐Inorganic Hybrid Photovoltaic Devices

“…have drawn much attention recently due to their interesting physical properties and technological applications. BiFeO 3 and Bi 2 WO 6 are the bismuth-layered ferroelectrics with simple structures. They have high curie temperatures (above 830°C) and large spontaneous polarization, 1,2 and are thus potential candidates for hightemperature piezoelectric and ferroelectric applications.…”

“…Moreover, they have attracted much interest for applications in ferroelectric random access memories because of the fatigue-free properties. [3][4][5][6] BiVO 4 exhibits some unique properties, such as ferroelasticity, 7 acousto-optical behavior, 8 and ionic conductivity, 9 etc. It has been widely used as gas sensors, 10 solid-state electrolytes, 11 and nontoxic yellow pigment for high-performance lead-free paints.…”

“…They have high curie temperatures (above 830°C) and large spontaneous polarization, and are thus potential candidates for high‐temperature piezoelectric and ferroelectric applications. Moreover, they have attracted much interest for applications in ferroelectric random access memories because of the fatigue‐free properties . BiVO 4 exhibits some unique properties, such as ferroelasticity, acousto‐optical behavior, and ionic conductivity, etc.…”

Deviations from Vegard's Law and Intense Raman Scattering in Low‐Doped Bi2Mo1−xWxO6 (x = 0–10%) Ceramics

“…All grains have edge‐to‐edge dimensions of 1.8 μm, which is very well below the known standard range (2–10 μm) of grain size in bismuth layer materials. Such a well‐connected grain pattern is due to microwave sintering identical to other special methods such as spark plasma sintering responsible for controlled bismuth oxide loss from grain‐connecting surfaces to coalesce grains via pore‐free boundaries . Average grain size is 3 μm using ImageJ software that presumably incorporates width of darker void boundaries into estimation.…”

Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent

“…However, interesting physical and chemical properties of the less stable structures may arise, since these exhibit unique properties that are distinct from those of the thermodynamically stable phase [8][9][10] . In this regard, in recent years, several researchers have reported many interesting potential applications of transition-metal tungstates, because they exhibit a special symmetry property caused by spontaneous polarization, which in turn implies ferroelectric behavior, ionic conductivity and photoluminescence [11][12][13][14] .…”