(Bi3TiNbO9)x(SrBi2Nb2O9)1−x aurivillius type structure piezoelectric ceramics obtained from mechanochemically activated oxides

Pardo, L.; Castro, A.; Millán, P.; Alemany, C.; Jiménez, Ricardo; Jiménez, B.

doi:10.1016/s1359-6454(99)00459-0

Cited by 104 publications

(53 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…En esta misma línea, en el grupo de trabajo del autor se ha comenzado a aplicar esta nueva técnica para la preparación de cerámicas ferro-piezoeléctricas con estructura tipo perovsquita en capas, consiguiéndose simplificar las condiciones de síntesis, con fuertes reducciones de tiempos y temperaturas de tratamientos (41,42) y ostensible mejoría de sus propiedades eléctricas (43,44). Para ello se han empleado dos sistemas de activación diferentes, un molino vibratorio y uno planetario, utilizando en ambos casos morteros y bolas de distintos materiales, fundamentalmente acero, ágata y circón, obteniéndose resultados muy similares independientemente del material del que esté constituido el sistema de activación.…”

Section: Importancia De Los Metodos De Síntesis Utilizadosunclassified

“…Así, partiendo de la mezcla estequiométrica de Bi 2 O 3 , Nb 2 O 5 , TiO 2 y SrCO 3 , y sometiéndola a un tratamiento mecánico, se obtiene un precursor amorfo (41), a partir del cual se han preparado cerámicas mediante un único y sencillo tratamiento de sín-tesis y sinterización natural al aire, con unas características mesoestructurales y de respuestas eléctricas muy mejoradas (43,44,49,50).…”

Section: Fases Con N=2 [Bi 2 O 2 ][Ab 2 O 7 ]unclassified

See 1 more Smart Citation

Óxidos con estructura tipo perovsquita laminar: síntesis, características estructurales y propiedades eléctricas

Castro¹

2002

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

Los óxidos tipo Aurivillius presentan una estructura perovsquita laminar, constituida por el apilamiento de capas tipo perovsquita [A n-1 B n O 3n+1 ] y capas [Bi 2 O 2 ]. Se estudia la estabilidad estructural de estos óxidos en función de los radios iónicos de los cationes que participan en ellos y de la influencia de pares electrónicos libres (ns 2 ) asociados a los cationes que constituyen la capa de bismuto. Se han puesto a punto métodos alternativos que permiten optimizar las condiciones de síntesis y abaratar los sistemas de producción, como el de activación mecanoquímica. Se muestran ejemplos de fases de Aurivillius, en los que se pone de manifiesto las propiedades ferro-piezoeléctricas y de conductividad iónica de estos materiales. La mesoestructura y propiedades ferro-piezoeléctricas se ven netamente mejoradas gracias a la utilización del método mecanoquímico. Se demuestra que la T c es fuertemente dependiente de la estructura cristalina, la cual depende del tamaño y naturaleza de los cationes que constituyen cada fase. La conductividad iónica en estos materiales se produce por salto de iones oxígeno entre posiciones ocupadas y vacantes en la capa perovsquita, mientras que es insensible a la presencia de vacantes aniónicas en la capa de bismuto. Tratamientos mecánicos permiten el reciclado de ciertos materiales deteriorados en ciclos térmicos. Palabras clave: Perovsquitas laminares; pares electrónicos no enlazados; activación mecanoquímica; ferro-piezoelectricidad; conductividad iónica. Layered Perovskite Oxides: Synthesis, Structural Characteristics and Electrical PropertiesThe Aurivillius type oxides show a layered perovskite structure, built up by the interleaved of perovskite [A n-1 B n O 3n+1 ] and [Bi 2 O 2 ] sheets. The structural stability of these oxides is presented as a function of the ionic radii and lone pair of electrons (ns 2 ) of cations. New mechanochemical activation synthesis methods have been used in order to facilitate the preparation of Aurivillius phases and to cheapen their production systems. Some Aurivillius ferro-piezoelectric and ionic conductors examples are shown. The mesostructure and ferro-piezoelectric properties are improved by processing materials from mechanochemically activated amorphous powdered precursors. Change in unit-cell volume of these materials, by means of cationic substitutions, are responsible for the changes of their T c . Ionic conductivity in Aurivillius oxides occurs by hopping between neighboring oxygen positions within perovskite layer while ion migration within bismuth layer would have a negligible contribution. Mechanical processes can recycle some of these materials, damaged by consecutive thermal treatments. INTRODUCCIÓNLos óxidos pertenecientes al tipo estructural de las perovsquitas son conocidos por el gran número de propiedades físi-cas de interés que pueden presentar, las cuales pueden controlarse atendiendo a tres aspectos: la composición química, puesto que es posible realizar dopados y sustituciones catió-nicas en ellos; la estructura c...

show abstract

Section: Importancia De Los Metodos De Síntesis Utilizadosunclassified

Section: Fases Con N=2 [Bi 2 O 2 ][Ab 2 O 7 ]unclassified

Óxidos con estructura tipo perovsquita laminar: síntesis, características estructurales y propiedades eléctricas

Castro¹

2002

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

show abstract

“…15 ͑Bi 3 TiNbO 9 ͒ x ͑SrBi 2 Nb 2 O 9 ͒ 1−x solid solution ceramics with x = 0.6 present a higher piezoelectric coefficient ͑d 33 =11 pC/ N͒ and lower coercive field ͑E c =67 kV/ cm͒ than those of Bi 3 TiNbO 9 ͑d 33 =1-4 pC/ N, E c Ͼ 75 kV/ cm͒. 16 In ͑Bi 3 TiNbO 9 ͒ 1−x ͑BaBi 2 Nb 2 O 9 ͒ x , much larger P r value ͑6-7 C / cm 2 ͒ was observed for x = 0.1-0.3 compared with P r ͑1 C / cm 2 ͒ of Bi 3 TiNbO 9 . The resistivity for x = 0.2 was one order larger than that of Bi 3 TiNbO 9 .…”

Section: Introductionmentioning

confidence: 97%

Microstructure and electrical properties of Aurivillius phase (CaBi2Nb2O9)1−x(BaBi2Nb2O9)x solid solution

Zhang

Yan

Reece

2010

Journal of Applied Physics

View full text Add to dashboard Cite

Articles you may be interested inThe microstructures and electrical properties of Aurivillius phase ferroelectric solid solutions of ͑CaBi 2 Nb 2 O 9 ͒ 1−x ͑BaBi 2 Nb 2 O 9 ͒ x ͑0 Յ x Յ 1͒ have been studied. X-ray diffraction analyses revealed a bismuth layered structure for all compositions. Scanning electron microscope images showed randomly oriented and platelike grain morphology. The Curie point T c or the maximum permittivity temperature T m decreased with increasing x. The ͑CaBi 2 Nb 2 O 9 ͒ 1−x ͑BaBi 2 Nb 2 O 9 ͒ x ceramics exhibited a ferroelectric-paraelectric phase transition at small x values ͑x Յ 0.5͒, whereas a relaxor behavior was observed at high x values ͑x Ն 0.8͒. The d 33 value of CaBi 2 Nb 2 O 9 ceramics was enhanced by Ba 2+ doping on the A-sites ͑x Յ 0.3͒. A combination of high d 33 values and high T c points ͑Ͼ700°C͒ suggests that compositions with x Յ 0.3 could be good candidates for high-temperature piezoelectric applications. The composition with x = 0.8 is a relaxor ferroelectric with T m around 320°C at 1 MHz.

show abstract

“…The main characteristic for this process is the high heating rate and short times that inhibit grain growth. The synthesis of BiGdWO 6 , BiYWO 6 or Bi 4 Ti 3 O 12 in only 10 min has been reported [35,36]. Temperatures of 900-1100 • C have been measured in those articles.…”

Section: Processing Of Ceramics With Aurivillius Type Structurementioning

confidence: 95%

“…A major drawback for this method is to have dense ceramics with adequate grain size. Its lamellar crystal growth makes the compaction of the precursor ceramic powder more difficult and the reduced mass transport during sintering leads to porous ceramics (higher than 10% of porosity) [6], which makes difficult their uses in piezoelectric applications.…”

Section: Processing Of Ceramics With Aurivillius Type Structurementioning

confidence: 99%

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Moure

2018

Applied Sciences

107

View full text Add to dashboard Cite

According to the EU-Directives 2002/95/EC, 2002/96/EC, lead-based piezoceramics must be substituted in the future with more environmentally friendly alternatives, only when a reliable alternative is found. This is why an increasing interest has grown in the research community to find lead free piezoelectric materials that fulfil the requirements for this substitution. Different families of compounds have been shown to be possible candidates for this use, such as bismuth and niobates based perovskites, pyrochlores, etc. However, a material with piezoelectric coefficients similar to those of PZT (lead zirconate titanate, Pb[Zr x Ti 1-x ]O 3 ) has not been yet found. Besides, each of these families has its specific characteristics in terms of remnant polarization, coercive field or application temperature. Thus, the choice of each material should be made according to the specific needs of the application. In this sense, Aurivillius-type structure materials (also known as Bismuth Layered Structure Ferroelectrics, BLSF) can take advantage of their specific properties for uses as Lead Free Piezoelectric systems. Some of them have a high Curie temperature, which make them good candidates to be used as high temperature piezoelectrics; high coercive fields, which facilitates their use as actuators; or a high switching fatigue resistance, which can be useful for future applications as Ferroelectric Random Access Memories (FERAM).Keywords: bismuth layered ferroelectric structures; aurivillius; piezoelectric; multiferroic OverviewMany of the peculiar characteristic properties of Aurivillius materials are determined by their crystalline structure. Figure 1 shows the prototype of the Aurivillius structure as a function of the number of pseudo-perovskite layers [2]. The "n" values can range from 1 to ∞. In this case (n = ∞), the repeated cell is the pure perovskite. The number of perovskites can be odd, even or a mixture. Examples of each case are Bi 2 WO 6 (n = 1) and Bi 4 Ti 3 O 12 (n = 3); Bi 3 TiNbO 9 , SrBi 2 Nb 2 O 9 (n = 2) and CaBi 4 Ti 4 O 12 (n = 4); an example for a mixture Aurivillius is Bi 7 Ti 4 NbO 21 . In this case, layers with 2 or 3 pseudo-perovskites are alternated with the [Bi 2 O 2 ] 2+ layers.At difference of the ferroelectrics with perovskite structure, the polarization is not produced by the displacement of the B cation within the oxygen octahedral but by relative shifts of the oxygen octahedral through the a-axis with respect to the [001] bismuth chain. They can be divided in 3 main movements, as illustrated in references [3-5]:Oxygen octahedral in the a-axis. -Relative displacements in the opposite direction to B cations of the perovskite with respect to the octahedral. -Displacement through the a-axis of the oxygen ions of the Bi-O layer.

show abstract

(Bi3TiNbO9)x(SrBi2Nb2O9)1−x aurivillius type structure piezoelectric ceramics obtained from mechanochemically activated oxides

Cited by 104 publications

References 12 publications

Óxidos con estructura tipo perovsquita laminar: síntesis, características estructurales y propiedades eléctricas

Óxidos con estructura tipo perovsquita laminar: síntesis, características estructurales y propiedades eléctricas

Microstructure and electrical properties of Aurivillius phase (CaBi2Nb2O9)1−x(BaBi2Nb2O9)x solid solution

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Contact Info

Product

Resources

About