Optical and electro-optical properties of (Pb,La)TiO3 transparent ceramics

Londoño, F. A.; Eiras, J. A.; Garcia, D.

doi:10.1016/j.optmat.2012.02.020

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…The very low transmittance of sample PLT23 may be explained by the segregation phases, since the ferroelectric character of this specimen is too low to attribute scattering to domains (23).…”

Section: Optical and Electro-optical Propertiesmentioning

confidence: 97%

Optical and electro-optical characteristics of hot-pressing (Pb1-xLax)TiO3 ferroelectric ceramics

Londoño¹,

Eiras²,

Garcia³

2012

Bol. Soc. Esp. Ceram. Vidr.

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La-modified PbTiO 3 -based ceramics (PLT) are the subject of many studies in term of piezoelectric and pyroelectric applications, but the processing of PLT to optimize their transparency and electro-optical properties has not been studied in detail. Ferroelectric (Pb 1-x La x )TiO 3 (PLT) ceramics, with 0.18 ≤ x ≤ 0.23, were produced by a solid state reaction and uniaxially hot pressing for 3h at a temperature of 1220 o C, and a pressure of ~6,0 MPa. High density, translucent reddish color and high dc conductivity were observed for all compositions. Nevertheless appropriate thermal treatments in an O 2 atmosphere, after hot pressing, led to ceramics with good properties for dielectric, optical and electro-optical studies. The heat-treated samples revealed a homogeneous microstructure, absence of second phases, increased of the transmittance in the visible and infrared range and reduced dc conductivity. These features allowed the electro-optical coefficient of the (Pb,La)TiO 3 system to be calculated. Keywords: Ferroelectric ceramics, electro-optics, hot-pressing, transparency. Características ópticas y electro ópticas de cerámicas ferroelétricas del sistema (Pb 1-x La x )TiO 3 obtenidas por prensado en calienteLas cerámicas basadas en PbTiO 3 con adición de La, (PLT) han sido ampliamente estudiadas debido a sus aplicaciones piro y piezoeléctricas. Por otra parte, el procesamiento de PLT para optimizar su transparencia y sus propiedades electro-ópticas no ha sido estudiado com el mismo detalle. En el presente trabajo, se han preparado cerámicas ferroeléctricas de (Pb1-xLax) TiO 3 (PLT) con 0.18 ≤ x ≤ 0.23, mediante síntesis en estado sólido y prensado uniaxial en caliente por 3 h a una temperatura de 1220 o C, y una presión de ~6,0 MPa. En todas lãs composiciones se han observado una alta densidad, baja transparencia y conducción eléctrica elevada. Mediante adecuados tratamientos posteriores en atmósfera de O 2 se há mejorado la calidad eléctrica y óptica de dichas cerámicas. La microestructura es homogénea, la transmitancia en las regiones visible e infrarroja crece y la conductividad DC disminuye. Estas características han permitido medir el coeficiente electro-óptico en muestras del sistema (Pb,La)TiO 3 .

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Section: Optical and Electro-optical Propertiesmentioning

confidence: 97%

Optical and electro-optical characteristics of hot-pressing (Pb1-xLax)TiO3 ferroelectric ceramics

Londoño¹,

Eiras²,

Garcia³

2012

Bol. Soc. Esp. Ceram. Vidr.

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“…In South America, advanced densification processes have been used since the 1990s with the work of García, Kiminami, Londoño and others [6], [8], [30], [31]. Currently, densification techniques such as pulsed plasma and microwave densification have contributed to improve and obtain properties in ceramics such as SBT type ceramics.…”

Section: Source: Ownmentioning

confidence: 99%

Review: Densification process of ceramic materials

2020

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Ceramics has played an important role in the technological and socio-economic development of humanity, so that they can be used to identify different historical periods of the humanity. Babylonians, Greek, Andalusian, among other cultures have used the ceramics and developed several methods to improve the products obtained by pottery. Generally, the ceramics can be divided into two big areas, traditional and structural ceramics. Ceramics manufactured with clay, Traditional Ceramics, currently they are being studied in the improvement of structural, abrasives, cement, refractory, among other materials. On the other hand, the ceramics developed as a result of new technologies and the exploitation of natural resources, Structural Ceramics, they are a great interest for the science of ceramic materials due to the development of ceramics with properties that incorporate attributes of various materials in only one material, in addition to the contributing to the phenomenological study at a scientific level. Advances in the processes of densification and doping of these materials have allowed to obtain ceramics with high mechanical resistance, high hardness, high resistance to attrition and corrosion, good chemical and thermal stability; features that have directly influenced the type of applications such as bulletproof vests, transparent shields, high temperature electrical insulators, superconducting devices, electronic materials among other applications

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