Relaxor behavior and dielectric properties of (La, Ta)-modified (K0.5Na0.5)NbO3 lead-free ceramics

Room-temperature ferromagnetism and ferroelectricity of nanocrystalline La2Ti2O7

“…6) at the third and fourth quadrants. Similar P-E loops were also observed by other groups [9,28,[40][41][42]. The shapes of P-E loops for our La 2 Ti 2 O 7 nanocrystalline pellet are very similar to those of P-E loops for multiferroics Bi 1−x Ba x FeO 3 (x = 0.15) [9].…”

Effect of synthesis method on the long-range order of the space charge type in 0.75PFW–0.25PT ceramics

“…The empirical laws were individually proposed by Martirena [45,46]. To date, several studies have adopted these empirical laws to successfully discuss the DPT phenomenon of relaxors [10,[16][17][18][19][20][21][22][23]40,[45][46][47][48][49]. Recently, another study has shown that the fitting curves are the same among them [17].…”

“…value which denotes the diffusive parameter is in the range between 1 and 2. It shows the normal ferroelectric characteristic as the value nears 1 and shows the total DPT relaxor characteristic as the value nears 2. represents that the diffusive extension and the diffused phase characteristic is more obvious when the value is larger [10,[16][17][18][19][20][21][22][23]40,[45][46][47][48][49].…”

Lead-Free Ferroelectric Ceramics with Perovskite Structure

“…The method is simple and economic comparing with HP or SPS which will be described in the next sections. Most studies about KNN and related compositions use conventional sintering (Chang et al, 2007;Egerton & Dillon, 1959;Hao et al, 2009;Park et al, 2007;Saito & Takao, 2006;Y. Wang et al, 2007;Zuo et al, 2007), and just some papers report lead-free piezoceramics sintered by HP or SPS.…”

“…The grain size also influences the dielectric response (Fang et al, 1993;Hoshina et al, 2008), but there are the intrinsic effects due to the introduction of cations in the A and B sites of the ABO 3 structure. More precisely, when donor-type doping of KNN with La +3 and Ta +5 is performed (Hao et al, 2009) and in BaTiO 3 (Morrison et al, 1999), the dielectric constant at the T C decreases and the transition became broad, this behavior it is not well understood but it is suggested that the many different transitions collapse at once resulting in the broad pick at T C . In the KNLNT it seems that the Ta +5 doping induces that the ε r was lower at the transition compared with pure KNN, the contribution of grain size was discarded.…”