Li-Substitution Effect and Ferroelectric Properties in Piezoelectric Semiconductor ZnO

Ferroelectricity in Simple Binary Crystals

“…A dielectric anomaly in Zn1-xLixO (x = 0.09) was found at 470 K (Tc) (Figure 4), though pure ZnO shows no anomaly from 20 K to 700 K. The small dielectric anomaly (εmax = 21) is the same order with Cd1-xZnxTe (εmax = 50). The spontaneous polarization is 0.9 µC/cm 2 [30,31]. The phase diagram between Tc and x is shown in Figure 5, which reminds us of a phase diagram of quantum ferroelectrics such as KTa1-xNbxO3 and Sr1-xCaxTiO3.…”

Enhanced ferroelectric, dielectric and optical behavior in Li-doped ZnO nanorods

“…5a. At room temperature, the dielectric constant at lower frequency region at 1 kHz at RT is high (ε ∼ 19) for Li-doped ZnO nanorods as compared to bulk Li-doped ZnO (ε ∼ 9) [28]. The dielectric loss (tan ı) decreases with increase in frequency and dielectric loss of Li-doped ZnO nanorods is 0.03 at 2 MHz at RT (Fig.…”

PMN–PT Ceramics Prepared By Spark Plasma Sintering

“…The short sintering time for the SPS process could be advantageous in suppressing grain growth and lead loss typical of sintering lead‐containing perovskite FEs. Although SPS is commonly used to produce dense metal and engineering ceramics, attempts to prepare dielectric, FE, and piezoelectric ceramics with fine grain sizes by this technique have only been made in recent years 20–27 . The results show that the SPS samples exhibit enhanced permittivity, increased coercive field, and a diffuse PE/FE transition, in contrast to the CS ones.…”