Materials Literature
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Submicron particles of potassium niobate KNbO 3 were prepared by a colloid chemistry method. A rock-salt-type KF block in a layered perovskite, K 2 NbO 3 F, with a K 2 NiF 4 type structure was selectively dissolved in water to produce perovskite nanosheets at room temperature. The self-assembly between perovskite nano…
Ferroelectric Pb(Zr,Ti)O 3 (PZT) thin films with various Zr/Ti ratios were fabricated by ink-jet printing (IJP). Two kinds of precursor solutions for PbTiO 3 (PT) and PbZrO 3 (PZ) were prepared from Pb(OCOCH 3 ) 2 ·3H 2 O, Ti[OCH(CH 3 ) 2 ] 4 and Zr(OC 4 H 9 ) 4 . Seven 1 ×1 cm 2 square patterns with mixing ratios PT:…
We discuss electrode-dielectric interfaces in ferroelectric thin films and thin films that have high dielectric constants. We consider the charge on the electrodes in several cases, and focus on the effects that arise from this charge being distributed over a finite length (i.e. the Thomas-Fermi screening length). The…
Pristine, W and Mn 1% doped Ba 0.6 Sr 0.4 TiO 3 epitaxial thin films grown on the LaAlO 3 substrate were deposited by pulsed laser deposition (PLD). Dielectric and ferroelectric properties were determined by the capacitance measurements and X-ray diffraction was used to determine both residual elastic strains and defe…
An atomic force microscope (AFM) probing system was connected with a ferroelectric test system to measure the polarization hysteresis ( P – E ) curve and longitudinal displacement properties simultaneously with a large AC drive signal at 5 Hz, since this measurement system has the advantages of enabling dynamic evalua…
The two-layered SrBi 2 Nb 2 O 9 (SBN) ceramic resonator that generates second harmonics of the thickness extensional vibration is a strong candidate for fine-tolerance-resonator applications, because of its small electromechanical coupling coefficient and high temperature stability. The Nd substitution of Sr in SBN is…
Dispersing fine particles into a sol-gel matrix is a promising process to get a thick 0–3 composite coating layer. In this paper, we have further improved this modified sol-gel process by nanocrystalline composite technique to realize the low temperature annealing. Dense Pb(Zr, Ti)O 3 (PZT) thick films of 10 to 50 µm…
Lanthanoid (M 3+ =La 3+ , Pr 3+ , Nd 3+ and Sm 3+ )-substituted and lanthanoid/vanadium (V 5+ )-cosubstituted bismuth titanate thin films were fabricated on (111)Pt/Ti/SiO 2 /(100)Si substrates by a chemical solution deposition (CSD) technique. All the films consisted of a polycrystalline structure with random crystal…
Titanium-containing alkoxide (Ti[i-OCH(CH 3 ) 2 ] 4 ) dissolved in 2-methoxyethanol was directly deposited onto silicon by the metalorganic decomposition (MOD) technique. Titanium oxide (TiO 2 ) thin films are formed uniformly on Si after high-temperature annealing. Raman and X-ray diffraction measurements indicate th…
Temperature dependent polarized transmission intensity studies in strongly converging and parallel light beams had been accomplished for off-zone-center incommensurate semiconductors-ferroelectrics TlInS 2 , TlGaSe 2 and TlGaS 2 having a layered structure and reportedly a C 2 h 6 space group of symmetry at room temper…
A single crystal about 15 mm in diameter and 10 mm in length of the lead indium niobate-lead titanate, (1- x )Pb(In 1/2 Nb 1/2 )O 3 – x PbTiO 3 [PIN–PT(1- x / x )] solid solution system near a morphotropic phase boundary was obtained by the solution Bridgman method using PbO–B 2 O 3 flux. X-ray diffraction study revea…
Sol-gel derived Pb(Mg 1/3 Nb 2/3 ) 0.7 Ti 0.3 O 3 (PMNT) thin films were prepared by sping coating using a PbO cover coat technique, and investigated by X-ray diffraction (XRD), auger electron spectroscopy (AES), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The phase development of t…
The tetragonal tungsten bronze type of Sr x Ba 1- x Nb 2 O 6 (SBN, 0.3≤ x ≤0.7) ceramics was synthesized using the solid state reaction method and the dielectric properties of SBN ceramics as a function of the Sr/Ba ratio were examined. With an increasing Sr/Ba ratio in SBN ceramics, the Curie temperature decreases wh…
Dense lead zirconate titanate (PZT) films in the thickness range of 2–100 µm were fabricated by the aerosol deposition method (ADM) to study the thickness dependence of the ferroelectric characteristics. The recovery of ferroelectricity by annealing is uniform inside a thick PZT film. Breakdown electrical field increa…
Ceramics were prepared from hydrothermally-synthesized BaTiO 3 (100 mol%), BaSiO 3 (1.5 mol%), MnO (0.1 mol%) with Ho 2 O 3 (0.5 mol%) and MgO (0.25–1 mol%). The compositions with Ho/Mg molar ratios of 4:4, 4:2, 4:1 were selected for examination. The ceramic samples were sintered at 1340°C ( P O2 <10 -9 Pa) and, then,…
Ceramics of the series (1- x )Bi 4 Ti 3 O 12 - x (Na 1/2 Bi 1/2 )TiO 3 (BTO-NBT) were made using a conventional mixed oxide and carbonate process. The structural properties revealed that the system passes through the formation of Aurivillius compounds with increasing number of perovskite blocks for an increasing amoun…
Domain-wall structures in the vicinity of the morphotropic phase boundary (MPB) in (1- x )Pb(Zn 1/3 Nb 2/3 )O 3 – x PbTiO 3 (PZN– x PT) mixed crystals ( x =5% and 8%) were investigated by means of a polarizing microscope. It was found that the apparent jump of the indicatrix rotation as a function of temperature appea…
High quality (K 0.5 Bi 0.5 )TiO 3 (KBT) powder has been successfully prepared by a polymerized complex method. The polymerized complex method is a simple process used to produce KBT powder with good compositional homogeneity and sinterability. KBT ceramics with a relative density of more than 90% can be successfully f…
The effect of Mn addition on the microstructure and electrical properties, especially on the dc-electrical degradation, of the X7R-type multilayer ceramic capacitor with Ni internal electrode (Ni-MLCC) with thin active layers was investigated. As the amount of Mn increased, grain growth was suppressed, and the tempera…
The dielectric properties under a high electric field ( ac -field) of BaTiO 3 -based ceramics with core grains, shell grains and core-shell grains were compared with those of multilayer ceramic capacitors (MLCCs) with these three kinds of grains. The MLCCs with the X7R specification had a core-shell structure, and the…