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Phonon scattering mechanisms dictating the thermal conductivity of lead zirconate titanate (PbZr1− x Ti x O3) thin films across the compositional phase diagram
Ist Teil von
Journal of applied physics, 2017-05, Vol.121 (20)
Ort / Verlag
United States: American Institute of Physics (AIP)
Erscheinungsjahr
2017
Link zum Volltext
Quelle
AIP Journals Complete
Beschreibungen/Notizen
This work represents a thorough investigation of the thermal conductivity
(κ) in both thin film and bulk
PbZr1–
x
Ti
x
O3
(PZT)
across the compositional phase diagram. Given the technological importance of
PZT as a
superb piezoelectric and ferroelectric material in devices and systems impacting a wide
array of industries, this research serves to fill the gap in knowledge regarding the
thermal properties. The thermal
conductivities of both thin film and bulk PZT are found to vary by
a considerable margin as a function of composition x. Additionally, we
observe a discontinuity in κ in the vicinity of the morphotropic phase
boundary (MPB, x = 0.48) where there is a 20%–25% decrease in
κ in our thin
film data, similar to that found in literature data for bulk
PZT. The
comparison between bulk and thin
film
materials
highlights the sensitivity of κ to size effects such as film thickness
and grain size even in disordered alloy/solid-solution materials. A
model
for the thermal
conductivity of PZT as a function of composition (
κ
(
x
)
) is
presented, which enables the application of the virtual crystal approximation for
alloy-type material systems with very different crystals structures, resulting in
differing temperature trends for κ. We show that in the case of
crystalline solid-solutions where the thermal conductivity of one of the parent materials exhibits
glass-like temperature trends the compositional dependence of thermal conductivity is
relatively constant for most values of x. This is in stark contrast with
the typical trends of thermal
conductivity with x in alloys, where the thermal conductivity increases
dramatically as the composition of the alloy or solid-solution approaches that of a pure
parent materials (i.e., as x = 0 or 1).