Thermal wave study of piezoelectric coefficient distribution in PMN-PT single crystals

Abstract

For Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) single crystals, the measured pyroelectric coefficient (at constant stress) is determined by the piezoelectric effect due to thermal strain (secondary pyroelectric effect). This provides new capabilities to characterise the PMN-PT crystal poling procedure using the thermal square wave method at constant frequency. In this work, the authors demonstrate for the first time the determination of the depth profile of the piezoelectric response of PMN-PT single crystals with a composition near the morphotropic phase boundary by means of thermal waves. A commercial PMNT-28 sample, poled along [001] direction, electroded with NiCr/Au and covered additionally with a black absorption layer was investigated.

Nondestructive evaluation of homogeneity of Mn-doped 0.23Pb(In1/2Nb1/2)O3–0.48Pb(Mg1/3Nb2/3)O3–0.29PbTiO3 single crystals via resonant ultrasound spectroscopy

“…This technique can be used to evaluate the composition and property variation from wafer to wafer. Movchikova et al [29] determined the depth profile of the piezoelectric response of PMN-PT single crystals by using thermal waves. It is necessary to develop a low-cost and high-efficiency NDE technique for evaluating the compositional homogeneity and property variation within a relaxor-based single-crystal sample.…”

Electrocaloric properties of 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3ceramics with different grain sizes

“…Only two publications exist on this topic: in the first one, the Pb 0.99 Nb 0.02 (Zr 0.75 Sn 0.20-Ti 0.05 ) 0.98 O 3 ceramic with finer grains (2.3 μm) exhibits half the EC temperature change (ΔT EC ) of the ceramic with coarser grains (7.6 μm), i.e., 1.3 K vs. 2.6 K at 30 kV cm −1 and 433 K 5 ; in the second study, both the chemical composition and the grain size of Ba 1-x Sr x TiO 3 ceramics were changed simultaneously and, therefore, no conclusions could be reached about the influence of the microstructure on the EC effect. 6 The relaxor-ferroelectric ceramics (1-x)Pb(Mg 1/3 Nb 2/3 ) O 3 -xPbTiO 3 (PMN-100xPT) exhibit a high dielectric permittivity, polarisation, piezoelectricity and the EC effect 1,2,[7][8][9] and can be used for different applications, such as piezoelectric transducers 10,11 or cooling devices of a new generation. 12 In our previous work, 13 we prepared PMN-30PT ceramics that withstand high electric field amplitudes up to 90 kV cm −1 and hence possess a high ΔT EC of 2.7 K. This ΔT EC value is one of the highest reported for the PMN-PT solid solution.…”

“…The relaxor-ferroelectric ceramics (1– x )Pb(Mg 1/3 Nb 2/3 )O 3 – x PbTiO 3 (PMN–100 x PT) exhibit a high dielectric permittivity, polarisation, piezoelectricity and the EC effect 1,2 ,7-9 and can be used for different applications, such as piezoelectric transducers 10,11 or cooling devices of a new generation. 12 In our previous work, 13 we prepared PMN–30PT ceramics that withstand high electric field amplitudes up to 90 kV cm −1 and hence possess a high Δ T EC of 2.7 K. This Δ T EC value is one of the highest reported for the PMN–PT solid solution.…”

Evaluation of polarization of embedded piezoelectrics by the thermal wave method

“…The primary effect of PZT is opposite in sign to the much smaIIer secondary one [13]. In relaxor ferroelectric piezocrystals like PMN-PT, the piezoelectric effect due to thermal strain provides a significant contribution to pyroelectric response [14]. This provides the capability of poling procedure control by means of thermal wave methods.…”