Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

Abstract

Quenching-induced circumvention of integrated aging effect of relaxor lead lanthanum zirconate titanate and (Bi1/2Na1/2)TiO3-BaTiO3 Appl. Phys. Lett. 102, 032901 (2013) (4BZT) is measured with the impulse excitation technique and contrasted with corresponding dielectric and structural data. While the dielectric properties suggest a phase transition, the high resolution XRD patterns remain virtually unchanged from room temperature up to high temperatures, confirming no change in their long-range order. In contrast, the elastic properties indicate a broad and diffuse ferroelastic transition denoted by a minimum in Y(T). By analogy to the elastic and dielectric data of PbZr x Ti 1Àx O 3 and PLZT, it is concluded that 20BKT and 4BZT are relaxors with polar nanoregions embedded in a metrically cubic matrix. Interestingly, no indication for the freezing temperature was reflected in any of the employed measurement techniques. From the saturation of Y(T), it is suggested that the Burns temperature may be approximated as 700 C. Moreover, it is found that the modification with the ternary end-member BiZn 1/2 Ti 1/2 O 3 results in an increase in Young's modulus. A comparison with the Bi 1/2 Na 1/2 TiO 3 -BaTiO 3 -K 0.5 Na 0.5 NbO 3 yields the same results. V C 2014 AIP Publishing LLC.

Temperature‐Dependent Deformation and Dislocation Density in SrTiO3 (001) Single Crystals

“…To independently measure the Young's modulus as a function of temperature, a nondestructive resonant frequency and damping amplifier technique (RFDA, HT1750, IMCE nv, Genk, Belgium) was used . This technique measures the flexural vibration frequency and calculates the Young's modulus using the mass and dimensions of the sample . For these measurements, longer rectangular bar single‐crystal specimens were utilized with dimensions 2 mm × 2 mm × 25 mm, but still with (100) equivalent faces and [001] growth direction, as before.…”

“…34 This technique measures the flexural vibration frequency and calculates the Young's modulus using the mass and dimensions of the sample. 35,36 For these measurements, longer rectangular bar single-crystal specimens were utilized with dimensions 2 mm 9 2 mm 9 25 mm, but still with (100) equivalent faces and [001] growth direction, as before.…”

Superior temperature‐stable dielectrics for MLCCs based on Bi0.5Na0.5TiO3‐NaNbO3 system modified by CaZrO3

“…This anomaly may be ascribed to the consequence of polar nanoregions (PNRs) thermal evolution . The permittivity response increases first after heating because the “active” fraction of PNRs, which can follow the external field, increases, and then decreases due to the reduction in the overall volume fraction of PNRs with higher temperature . With CaZrO 3 increasing, it was found that the overall permittivity was reduced and the anomaly was further deeply depressed, leading to flatter curves.…”

Elastic Properties and Enhanced Piezoelectric Response at Morphotropic Phase Boundaries

“…Recently, a study has been carried out of the Young’s modulus of some FE perovskites measured with the method of the impulse excitation [178]. The focus of the research is on the relaxor features of NBT-BT and NBT-KBT-BT.…”