Photoacoustic phase transition of the ceramic BaTiO3

Castañeda-Guzmán, R.; Villagrán-Munı́z, M.; Saniger-Blesa, José Manuel; Pérez-Martı́nez, O.

doi:10.1063/1.121876

Cited by 22 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The photoacoustic experiments were carried out with a setup consisting of a pulsed Nd:YAG laser (10 Hz, 5 ns pulse width); a beam splitter and a pyroelectric detector; a commercial electric tubular furnace connected to a PID temperature control; and a piezoelectric ceramic coupled to the sample through a quartz bar, and the averaged signals (200 scans) were monitored with a digital oscilloscope. 27 The outcoming acoustic signal detected by a piezoelectric transducer was generated in a BCTZ bulk sample without silver paste and thus nonpoled. These experiments were carried out at a heating rate so slow as to consider them temperature constant events.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba_0.85Ca_0.15Ti_0.90Zr_0.10O₃: Understanding Structural and Microstructural Response to the Electric Field

Reyes-Montero

Rubio-Marcos

Fuentes-Cobas

et al. 2021

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

The synergetic role of the phase transitions taking place between long-range, polar ordered, ferroelectric phases in lead-free ceramics with Ba 0.85 Ca 0.15 Ti 0.90 Zr 0.10 O 3 composition on their electromechanical behavior has been analyzed. Synchrotron X-ray diffraction (XRD) and Rietveld analysis revealed a room temperature coexistence of rhombohedral (R), tetragonal (T), and orthorhombic (O) phases. The proportions of these phases in the investigated samples vary from the order of 42R-45T-13O in the nonpolarized condition to an estimated 65R-26T-9O in the polarized, significantly textured sample. These characteristics are related to the complex ferroelectric domain distribution that electron scanning microscopy exposes, which favors domain wall mobility and provides a large extrinsic contribution to the electromechanical response of the material. A confocal Raman spectroscopy and imaging study was carried out on both unpoled and poled samples and reveals that, under the action of the electric field, the E(LO 3 ) + A 1 (LO 2 ) + E(TO 4 ) mode of the Raman spectra shifts from 517.8 to 516.4 cm −1 , indicating the lengthening of the distance between B 5+ type ions and their coordinated oxygens for the poled samples. Besides, the mentioned spatially resolved model of the Raman spectra shows a narrower distribution in the poled sample, compatible with the strong texture revealed by XRD. Photoacoustic signal evolution with the temperature, in agreement with the dielectric permittivity curve, reveals the diffusive character of the phase transition taking place at 40 °C between the long-range polar ordered phase at low temperature and the high temperature one, which influences the phase coexistence at room temperature. Moreover, an evaluation of the resultant complex piezoelectric, dielectric, and elastic coefficients at resonance, including all losses, is presented. The obtained results indicate the remarkable electromechanical activity, its anisotropy, and the soft character of this ferro-piezo-electric type ceramic.

show abstract

Section: ■ Materials and Methodsmentioning

confidence: 99%

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba_0.85Ca_0.15Ti_0.90Zr_0.10O₃: Understanding Structural and Microstructural Response to the Electric Field

Reyes-Montero

Rubio-Marcos

Fuentes-Cobas

et al. 2021

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

show abstract

“…Recientemente hemos presentado la tŽcnica fotoacoestica como un mŽtodo promisorio para el an ‡lisis de transiciones de fase, demostrando su alta sensibilidad en la determinaci-n de la temperatura de Curie en cer ‡mica de BaTiO 3 (7). En este trabajo presentamos la evaluaci-n de las transiciones de fase estructurales en cer ‡micas ferroelectricas basadas en PbTiO 3 , variando la temperatura.…”

Section: Introducciînunclassified

Detención fotoacústica de transiciones de fase en cerámicas ferroeléctricas

Guzmán¹,

Muniz²,

Blesa³

1999

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

Se presenta una tŽcnica fotoacoestica de l ‡ser pulsado para detectar las transiciones de fase en cer ‡micas ferroelŽctricas, determinando la temperatura de Curie y el cambio de estructura ferro-paraelŽctrico. Se muestran los cambios producidos en las se-ales fotoacoesticas generadas por l ‡ser pulsado de baja energ'a (< 200 µJ), utilizando para la detecci-n un sensor piezoelŽc-trico pegado a la muestra por medio de una varilla de vidrio o cuarzo. La tŽcnica desarrollada no requiere amplificaci-n de la se-al, ni preparaci-n especial de la muestra y presenta una relaci-n se-al a ruido excelente. Para demostrar la validez de la tŽcnica se aplic-al estudio de la determinaci-n de la temperatura de Curie de las cer ‡micas: PbSmTiO 3 y Pb(MgNb)TiO 3 . Los resultados se comparan con los obtenidos por otras tŽcnicas como son DTA, DMA y permitividad dielŽctrica. Phase transition on ferroelectric ceramics by photoacoustic detectionPhase transition on ferroelectric ceramics were detected by photoacoustic laser technique which allows the measurement of the Curie temperature and ferro-paraelectric transitions. The photoacoustic signal produced by low energy laser pulses using a piezoelectric transducer attached to the sample by a glass or quartz rod is shown. The developed technique requires nor signal amplification neither special preparation of the sample and have an excellent signal to noise ratio. In order to validate this technique it was applied to the measurement of Curie temperature of the PbSmTiO 3 and Pb(MgNb)TiO 3 ceramics. These results were compared with those obtained by DTA, DMA and dielectric permittivity.Key words: Photoacoustic, phase transition, ferroelectric ceramics, Curie temperature. I. INTRODUCCIîN.Desde 1963 White (1), sugiri-la posibilidad de generar ondas el ‡sticas en s-lidos por irradiaci-n con pulsos l ‡ser. El advenimiento de los l ‡seres pulsados ha permitido instrumentar f ‡cilmente la obtenci-n de se-ales acoesticas y se han desarrollado modelos te-ricos de los mecanismos de esta generaci-n (2-4). Esta tŽcnica presenta la ventaja de ser no destructiva, permite controlar la posici-n y la forma de la fuente de luz y las ondas el ‡sticas pueden generarse en s-lidos a altas temperaturas. Otro avance importante se logr-cuando se utiliz-la detecci-n piezoelŽctrica, en donde el transductor puede usarse en una amplia variedad de condiciones experimentales. La configuraci-n del arreglo puede ser muy compacta permitiendo construir dispositivos simples y sobre todo, los transductores piezoelŽctricos presentan buen acoplamiento acoestico cuando se encuentran en contacto directo con el material de prueba, de manera que las se-ales fotoacoesticas obtenidas as', no requieren amplificaci-n.De acuerdo a la densidad de potencia -ptica aplicada sobre una superficie libre, pueden ocurrir mecanismos de generaci-n de ondas el ‡sticas de dos tipos. Los que involucran una modificaci-n de la superficie irradiada (rŽgimen de ablaci-n) y las que no lo hacen (rŽgimen termoel ‡stico o expansi-n termoel ‡stica). En este...

show abstract

“…SPIE Vol. 4588 587 The photoacoustic technique using pulsed lasers has become a new experimental tool for material characterization 3 . This technique uses a mechanical wave generated on the surface of the material that travels at the speed of sound and is detected by using a piezoelectric transducer.…”

Section: Nitrogen Lasermentioning

confidence: 99%

“…In our research laboratory, we have used this technique to characterize properties of diverse materials [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic effect applied to sound speed measurement

2002

View full text Add to dashboard Cite

Keywords: Photoacoustic effect, homemade laser, speed of sound. ABSTRACT.We present a simple experiment to show the photoacoustic effect, a well established but not widely known effect which has many applications. The photoacoustic effect consists of the generation of acoustic waves by pulsed radiation incident on a sample. In our case, we used a homemade Nitrogen laser as a source of pulsed light for many samples in order to measure the speed of sound. The Nitrogen laser is easy to build by undergraduate students, it is a transversal discharge laser at atmospheric pressure (TEA), excited by a Blumlein circuit, emitting nanosecond pulses in the ultraviolet region of the spectrum (λ = 337.1 nm) and has been previously reported. The acoustic waves generated on the surface of the samples travel through the material and are detected with a piezoelectric sensor. The transducer is also easy to build using the piezoelectric of cigar lighters. The electric signals are registered by a 100 Mhz oscilloscope triggered by the light produced at the laser discharge. Knowing the thickness of the sample and the arrival time of the acoustic wave we can precisely measure the speed of sound. INTRODUCTION.

show abstract

Photoacoustic phase transition of the ceramic BaTiO3

Cited by 22 publications

References 14 publications

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba_0.85Ca_0.15Ti_0.90Zr_0.10O₃: Understanding Structural and Microstructural Response to the Electric Field

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba_0.85Ca_0.15Ti_0.90Zr_0.10O₃: Understanding Structural and Microstructural Response to the Electric Field

Detención fotoacústica de transiciones de fase en cerámicas ferroeléctricas

Photoacoustic effect applied to sound speed measurement

Contact Info

Product

Resources

About

Photoacoustic phase transition of the ceramic BaTiO3

Cited by 22 publications

References 14 publications

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba0.85Ca0.15Ti0.90Zr0.10O3: Understanding Structural and Microstructural Response to the Electric Field

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba0.85Ca0.15Ti0.90Zr0.10O3: Understanding Structural and Microstructural Response to the Electric Field

Detención fotoacústica de transiciones de fase en cerámicas ferroeléctricas

Photoacoustic effect applied to sound speed measurement

Contact Info

Product

Resources

About

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba_0.85Ca_0.15Ti_0.90Zr_0.10O₃: Understanding Structural and Microstructural Response to the Electric Field

Confocal Raman Microscopy, Synchrotron X-ray Diffraction, and Photoacoustic Study of Ba_0.85Ca_0.15Ti_0.90Zr_0.10O₃: Understanding Structural and Microstructural Response to the Electric Field