Giant power output in lead-free ferroelectrics by shock-induced phase transition

Shock‐driven depolarization behaviors and electrical output in BiAlO3‐doped Bi0.5Na0.5TiO3 ferroelectric ceramics

“…When the applied stress/strain is sufficiently high for the re-orientation/disappearance of the polarization, the depolarization of the poled ferroelectrics occurs, and the release of the bound charge can generate an electrical current. [3][4][5][6] This process results in a loss of P r and a decrease/elimination of the piezoelectric effect. A sudden release of this charge by rapid depolarization through compression (high strain rate loading) has been proposed as a source of rapid energy conversion.…”

Multilayer PZT 95/5 Antiferroelectric Film Energy Storage Devices with Giant Power Density

“…FEGs explore the unique ability of bulk ferroelectric materials to generate high voltage and high power under mechanical stress. [6][7][8][9][10][11][12]28] The FEG power density is comparable to that for multilayer ferroelectric film energy storage devices. FEGs are capable of producing high voltage with amplitude exceeding hundreds of kilovolts, not achievable for multilayer ferroelectric film structures.…”

“…[3][4][5] High strainrate adiabatic compression is one of the possible ways to deliver electric charge and energy stored in ferroelectrics to the load through pressure induced phase transition from ferroelectric (FE) to antiferroelectric (AFE) phase resulting in a complete depolarization of ferroelectric materials and release of the surface screening charge balancing the polarization. [6][7][8][9][10] One of the problems associated with adiabatically compressed bulk ferroelectric ceramics and single crystals is their inability to produce large amount of electric charge due to the limited electrode area and, correspondingly, limited amount of surface screening charge released in the course of stress-induced depolarization. [6][7][8][9][10][11][12] Modern technologies make it possible to fabricate high quality ferroelectric films with precise control of their composition and ferroelectric properties.…”

“…[6][7][8][9][10] One of the problems associated with adiabatically compressed bulk ferroelectric ceramics and single crystals is their inability to produce large amount of electric charge due to the limited electrode area and, correspondingly, limited amount of surface screening charge released in the course of stress-induced depolarization. [6][7][8][9][10][11][12] Modern technologies make it possible to fabricate high quality ferroelectric films with precise control of their composition and ferroelectric properties. [13][14][15][16] Multilayer ferroelectric films could provide large electrode area and significant amount of surface screening charge that are a few orders of magnitude higher than those for bulk ferroelectrics having the same volume.…”

“…FEGs can utilize a wide range of bulk ferroelectric materials (PZT ferroelectric ceramics, [6][7][8]28] 0.99[0.98(Bi 0.5 Na 0.5 )(Ti 0.995 Mn 0.005 )O 3 -0.02BiAlO 3 ]-0.01NaNbO 3 ferroelectric ceramics, [9] Na 0.5 Bi 0.5 TiO 3 ferroelectric ceramics, [10] (1-y-x)Pb(In 1/2 Nb 1/2 )O 3 -(y)Pb(Mg 1/3 Nb 2/3 )O 3 -(x)PbTiO 3 relaxor ferroelectric single crystals [11,12] ) having different mechanisms of stress-induced depolarization including FE-to-AFE phase transformations, domain reorientation, and depolarization due to the phase transformations without transition through a non-polar phase. The FEG ability to use different ferroelectric materials helps it to fit different applications.…”