Lanthanide series doping effects in lead zirconate titanate (PLnZT) thin films

Abstract

Lanthanide (Ln) doping of lead zirconate titanate (PLnZT 4/30/70) thin films was conducted to investigate effects on structural and electrical properties. Films were spin-coat deposited from precursor solutions made using a previously reported "basic route to PZT" chemistry. The remanent polarization (P r ), dielectric constant (⑀), dielectric loss (tan ␦), and lattice parameter values were obtained for each of the doped PLnZT films. Films doped with amphoteric cations (Tb, Dy, Y, and Ho) displayed high P r values, square hysteresis loops, and enhanced fatigue resistance. Smaller radius Ln-doped films display an increased tendency toward (100) orientation in otherwise (111)-oriented films.

Structurally Characterized Erbium Alkoxides for Use as an Amphoteric Dopant in PErZT Ceramic Thin Film and Nanoparticles

“…The ACE for PErZT thin films was probed using 11 as the dopant precursor due to the similarity with the Dy counterpart (Table 1). [7,8] Further, since new properties were expected on the nanoscale, attempts were made to generate Er 2 O 3 and PErZT nanoceramics. With this wide variety of structurally varied species, it was possible to further explore the "precursor structure argument" (PSA) [12][13][14][15][16] for nanoparticle morphology predictions.…”

“…[30][31][32] Increasing the steric bulk to the OtBu groups, led to crystallization of the trinuclear 4 which had additional HOtBu bound to it, as shown in Figure 2. Previously, we isolated a Ce/OtBu tetramer [30] that did not possess any Lewis basic solvents (i.e., thf, py, or HOtBu) however, the Er corollary could not be isolated without bound solvents as noted for the pyridine adduct, Er 3 (µ 3 -O)(µ-OtBu) 4 -(OtBu) 3 (py) 3 (7). Again, the py adduct appears to produce the oxo which argues for water present in the py; however, numerous structures using the same solvent did not yield the oxide, so the origin of the oxo is still unproven.…”

“…Unfortunately, the fatigue testing for the Er-doped films did not show the significant improvement noted for the Dy doping. [7,8] However, this sets a lower limit for the ACE phenomenon and the slightly larger Y and Ho cations are now under investigation.…”

“…Recently, we reported on the "aliovalent cation effect" (ACE) where the PZT thin films fatigue properties were improved through selective doping with lanthanide (Ln) cations that could occupy either the A or B site. [7,8] In particular, the Dy-doped PZT films (PDyZT) were found to possess high remanent polarization (P r ), high dielectric constant (εЈ), and reduced fatigue when cycled on Pt/Si wafers. [7,8] Due to the void of acceptable dysprosium alkoxide [Dy(OR) 3 ] precursors (see Table 1), it was necessary to synthesize and characterize a series of systematically varied Dy(OR) 3 …”

Enhanced Dielectric and Ferroelectric Properties of Donor (W6+, Eu3+) Substituted SBT Ferroelectric Ceramics

“…The maximum 2P r ~14 μC/cm 2 is observed in the sample with x = 0.20. A lot of studies on the influence of rare-earth ion substitution in simple perovskite ferroelectrics have shown improved ferroelectric properties [88,[112][113][114][115]. The substitution of smaller lanthanoid ions like Samarium (Sm 3+ ), Neodium (Nd 3+ ) and lanthanum (La 3+ ) etc.…”