Piezoelectric and ferroelectric properties of (Bi1−xNa0.8K0.2Lax)0.5TiO3 lead-free ceramics

Wang, Baoyin; Luo, Laihui; Ni, Feng; Du, Peng; Li, Weiping; Chen, Hongbing

doi:10.1016/j.jallcom.2012.02.114

Cited by 51 publications

(25 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…42,44,45 47 Nevertheless, the macroscopic properties of BNT-BKT system with La 3þ entering into Bi-sites differ considerably from the materials presented here. 15 Therefore, we presume that La 3þ entered into the lattice in the chosen deficient sites of Na þ and K þ for the BN0.39KLT and BNK0.09LT, respectively. The most feasible charge compensation is thus by the creation of K þ and Na þ cation vacancies, 18,42 as given in the below equation…”

Section: A Effect Of Chemical Substitution On Microstructurementioning

confidence: 98%

“…[8][9][10][11][12] Other studies focused on either A-and/or B-site doping to improve small and large signal electromechanical properties. [13][14][15][16] It was proved that either replacing Bi on the A-site 16 or all A-site cations are effective approaches. 13 Compositional modifications with iso-and aliovalent dopants are technologically relevant because small doping amounts can modify considerably electrical properties due to cation vacancy formation and chemical pressure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

Acosta

Liu

Deluca

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

Articles you may be interested inSolid-state conversion of (Na1/2Bi1/2)TiO3-BaTiO3-(K1/2Na1/2)NbO3 single crystals and their piezoelectric properties Appl. Phys. Lett. 104, 222910 (2014) The morphotropic phase boundary composition Bi 1/2 Na 1/2 TiO 3 -20 mol. % Bi 1/2 K 1/2 TiO 3 was chosen as initial material to do selective A-site aliovalent doping replacing Na and K by 1 at. % La, respectively. The materials were studied macroscopically by measuring dielectric and electromechanical properties. The Na-replaced material has a lower freezing temperature T fr , lower remanent polarization and remanent strain, and thus a higher degree of ergodicity than the K-replaced material. These results are contrasted with local poling experiments and hysteresis loops obtained from piezoresponse force microscopy. The faster relaxation of the tip-induced local polarization and the lower remanent state in bias-on and -off loops confirm the higher degree of ergodicity of the Na-replaced material. The difference in functional properties is attributed to small variations in chemical pressure achieved through selective doping. Raman results support this working hypothesis. V C 2015 AIP Publishing LLC.[http://dx

show abstract

Section: A Effect Of Chemical Substitution On Microstructurementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

Acosta

Liu

Deluca

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…When the BZT content further increased to 0.12 mol fraction, T p value increased while the decreasing tendency of T m did not change. The decrease in T p and T m for the samples with B0.09BZT could be mainly caused by the ion substitutions which had an effect on the increase in the degree of cation disorder and the dynamic of PNRs, resulting in the lower degree of interaction strength between PNRs [17,23,28,43,44]. Such effect was consistent with the previous work that the corresponded temperatures of Bi 1/2 (Na 0.82 K 0.18 ) 1/2 TiO 3 ceramic decreased due to the increase in degree of cation disorder resulted from BaZrO 3 substitution [45].…”

Section: Resultsmentioning

confidence: 99%

“…The observation of such anomalies was proposed to be caused by the thermal evolutions of polarnano regions (PNRs) [21,22]. With a transmission electron microscopy (TEM) technique, it was found the coexistence of the polar domains with the space groups of P4 mm and P4bm, and the size in the range of 5-10 nm at the temperature below T p [17][18][19]23]. Moreover, Shi et al observed the coexistence of tetragonal and rhombohedral nanodomains in (Bi 0.5 Na 0.5 ) 0.945 Ba 0.055 TiO 3 -based ceramics [24].…”

Section: Introductionmentioning

confidence: 99%

The effect of BZT doping on phase formation, dielectric and ferroelectric properties of BNLT ceramics

Kantha

Pisitpipathsin

Promsawat

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

In this work, the effect of BaZr 0.05 Ti 0.95 O 3 (BZT) doping on phase, dielectric and ferroelectric properties of a lead-free piezoelectric ceramic system of Bi 0.4871 Na 0.4871 La 0.0172 TiO 3 (BNLT) was studied. The different amounts of BZT were incorporated into BNLT to form (1-x)BNLT-xBZT ceramics (when x = 0, 0.06, 0.09 and 0.12 mol fraction). The rhombohedral phase was presented in the pure BNLT ceramic, which changed into the tetragonal phase with BZT incorporation. The lattice parameters and unit cell volume increased with increasing BZT content. Grain sizes tended to decrease with increasing BZT content. The dielectric constant of the BNLT ceramic was enhanced by BZT incorporation. The dielectric constant was maximized with the 0.09BZT incorporation. The temperature of the dielectric peak of BNLT ceramic decreased while the degree of diffuse phase transition increased with BZT substitution. The polarization-electric field (P-E) curve measured at temperature above 30°C was found to be slimmer with increasing BZT content. The remnant polarization of the BZT-incorporated ceramics decreased with increasing temperature. The observed results were believed to be caused by the lattice distortion and the enhanced cation disorders in A and B-site lattices due to the incorporation of Ba 2? and Zr 4? ions into A and B-site lattices, respectively, of BNLT perovskite structure.

show abstract

“…Al respecto, el sistema binario BNT-BKT, en estado tetragonal, presenta propiedades piezoeléctricas similares a las de los compuestos ricos en plomo y, por lo tanto, pueden ser considerados como posibles sustitutos (12). Recientemente se ha reportado el uso de aditivos que permitan reducir las temperaturas de sinterizado o potenciar los efectos piezoeléctricos del material (13)(14)(15).…”

Section: Resultados Y Discusionesunclassified

Estudio de las condiciones de procesamiento de Bi0.5(Na0.8K0.2)0.5TiO3

Camargo¹,

Ramajo²,

Rubio-Marcos³

et al. 2014

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

INTRODUCCIÓNLos cerámicos basados en el sistema circonato-titanato de plomo (Pb(Zr,Ti)O 3 -PZT) son los materiales más utilizados para aplicaciones tales como actuadores, sensores, transductores o vibradores (1-3). En general, se caracterizan por tener alta sensibilidad, confiabilidad y la capacidad de operar en un amplio intervalo de temperaturas. Si bien, estos materiales se fabrican generalmente a partir de la técnica de mezcla de óxidos, que es relativamente simple y económica, emplean un alto contenido de óxido de plomo (aprox. 70 %) (4). En la actualidad existe la necesidad de buscar materiales alternativos a los tradicionales PZT, debido a la volatilización del óxido de plomo durante el proceso de sinterización, a la extensa permanencia del plomo en el medio ambiente y a la acumulación de este elemento en los organismos que provoca daños en el sistema neurológico. Por este motivo, el plomo está siendo retirado de los procesos industriales según una normativa publicada por la Unión Europea (5). Sin embargo, los sistemas piezoeléctricos están fuera de esta normativa debido a la falta de una alternativa real al PZT. En base a estas premisas, en los últimos años la búsqueda de una alternativa real al PZT se ha focalizado entre otros en sistemas basados en niobatos alcalinos. En este sentido, los cerámicos basados en el sistema (K 0,5 Na 0,5 )NbO 3 (KNN) son considerados como posible reemplazo de los PZT, dado que presentan una transición de fase morfológica que incrementa las propiedades dieléctricas. Sin embargo, las principales desventajas del sistema (K 0,5 Na 0,5 )NbO 3 son la sensibilidad de sus propiedades con la composición y el complejo proceso de densificación (6-8). El uso de diversos aditivos, tales como LiSbO 3 (LS), LiTaO 3 (LT), o SrTiO 3 (9-11), constituye una vía alternativa para incrementar la densificación y sus propiedades piezoeléctricas con métodos tradicionales de sinterizado.Otras composiciones con comportamiento piezoeléctrico, tales como Bi 0.5 Na 0.5 TiO 3 (BNT) y Bi 0.5 K 0.5 TiO 3 (BKT), han recibido gran atención debido a sus excelentes propiedades piezoeléctricas y ferroeléctricas en el borde de su fase En este trabajo se estudian las condiciones de procesamiento de sistemas Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 (BNKT) que permitan obtener materiales cerámicos con buenas propiedades ferroeléctricas. Los reactivos de partida fueron activados mecanoquímicamente y mediante análisis térmico diferencial y termogravimetría (ATD-ATG) se determinaron las temperaturas de descomposición, mientras que por difracción de Rayos X (DRX) se identificaron las diferentes fases cristalinas. El efecto de la temperatura de sinterización en el sistema BNKT fue caracterizado mediante microespectroscopía Raman y espectroscopía de impedancia. Se determinó que las muestras sinterizadas a 1100 ºC no presentan fases secundarias, y proporcionan los mayores valores de densidad, y las menores pérdidas dieléctricas. En estas muestras mediante DRX no se registró la presencia de fases secundarias. Palabras clave: Piez...

show abstract

Piezoelectric and ferroelectric properties of (Bi1−xNa0.8K0.2Lax)0.5TiO3 lead-free ceramics

Cited by 51 publications

References 43 publications

Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

Tailoring ergodicity through selective A-site doping in the Bi1/2Na1/2TiO3–Bi1/2K1/2TiO3 system

The effect of BZT doping on phase formation, dielectric and ferroelectric properties of BNLT ceramics

Estudio de las condiciones de procesamiento de Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub>

Contact Info

Product

Resources

About