Thermal diffusivity measurements of thin films with a pyroelectric calorimeter

Coufal, H.; Hefferle, P.

doi:10.1007/bf00616499

Cited by 53 publications

(12 citation statements)

References 22 publications

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“…In comparison with other photothermal techniques, PPE has proved to be more sensitive, rather simple to utilize and also able to show faster response time (ns range), thanks to the possibility to deposit the pyroelectric transducer in the form of a thin film, which makes it extremely useful for those applications relying on the use of light pulses for the sample heating. 51,52 …”

Section: A Background On Pyroelctric Detectionmentioning

confidence: 98%

Invited Review Article: Photopyroelectric calorimeter for the simultaneous thermal, optical, and structural characterization of samples over phase transitions

Zammit

Marinelli

Mercuri

et al. 2011

Review of Scientific Instruments

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The study of thermophysical properties is of great importance in several scientific fields. Among them, the heat capacity, for example, is related to the microscopic structure of condensed matter and plays an important role in monitoring the changes in the energy content of a system. Calorimetric techniques are thus of fundamental importance for characterizing physical systems, particularly in the vicinity of phase transitions where energy fluctuations can play an important role. In this work, the ability of the Photopyroelctric calorimetry to study the versus temperature behaviour of the specific heat and of the other thermal parameters in the vicinity of phase transitions is outlined. The working principle, the theoretical basis, the experimental configurations, and the advantages of this technique, with respect to the more conventional ones, have been described and discussed in detail. The integrations in the calorimetric setup giving the possibility to perform, simultaneously with the calorimetric studies, complementary kind of characterizations of optical, structural, and electrical properties are also described. A review of the results obtained with this technique, in all its possible configurations, for the high temperature resolution studies of the thermal parameters over several kinds of phase transitions occurring in different systems is presented and discussed.

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Section: A Background On Pyroelctric Detectionmentioning

confidence: 98%

Invited Review Article: Photopyroelectric calorimeter for the simultaneous thermal, optical, and structural characterization of samples over phase transitions

Zammit

Marinelli

Mercuri

et al. 2011

Review of Scientific Instruments

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“…In optimizing the material characteristics, the dielectric constant €', dielectric loss and pyroelectric coefficient must all be considered together. The materials figures of merit are (1) F1 = p1/Cs, for high current responsivity (2) F p/C €' for high voltage responsivity and (3) FD = p1/Ce (e' X tan )" for high detectivity. p1, F and FD for all the samples are plotted in figs.…”

Section: Resultsmentioning

confidence: 99%

<title>PZT ceramics modified by rare earths as suitable candidates for thermal IR sensors</title>

et al. 1998

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The paper reports the structural, dielectric and pyroelectric properties of PZT ceramics modified by 5 % rare earths i.e. Ce3, Nd3, Sm3+, Eu3 and Gd3. Out of these PLZT and PGZT were in tetragonal phase. The lattice volume decreases as rare earths ionic radii decreases except PEZT and PGZT. Dielectric constant is found to increase with temperature but decreases with frequencies. The value of tanô, however, decreases upto 80°C and then increases slightly. The pyrocurrents (p) as well as pyrocoefficients (j)increase with temperature upto 50°C and then remains constant upto 80°C. Above 80°C (p and p1) increase linearly with temperature. The pyro coefficient (p.) and figures of merit of these ceramics are comparable to other thermal JR sensor materials.The preparation of these ceramics is relatively simple, inexpensive and properties can be tailored according to the desirable characteristics of the sensors. The results of the studies have shown that these ceramics would be very useful for the development of thermal JR sensors.

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“…The photopyroelectric method ͑PPE͒ [35][36][37][38] is another example of a contact photothermal technique that has been widely used for the optical and thermal characterization of different materials. This technique consists essentially of using a pyroelectric sensor in close contact with the sample under investigation.…”

Section: Photopyroelectric "Ppe… Techniquementioning

confidence: 99%

Photothermal techniques applied to thermophysical properties measurements (plenary)

Vargas

Miranda

2003

Review of Scientific Instruments

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In this article, we present a bird’s eye view of applications of photothermal techniques for evaluation of the thermal properties of different materials. This is followed by the presentation of specific techniques for direct measurements of thermal diffusivity and thermal effusivity and indirect measurements of heat capacity. The presentation finishes by discussing the use of alternative photothermal techniques for the investigation of thermal and transport properties of gases and liquids.

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Thermal diffusivity measurements of thin films with a pyroelectric calorimeter

Cited by 53 publications

References 22 publications

Invited Review Article: Photopyroelectric calorimeter for the simultaneous thermal, optical, and structural characterization of samples over phase transitions

Invited Review Article: Photopyroelectric calorimeter for the simultaneous thermal, optical, and structural characterization of samples over phase transitions

<title>PZT ceramics modified by rare earths as suitable candidates for thermal IR sensors</title>

Photothermal techniques applied to thermophysical properties measurements (plenary)

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