A5044575278- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Electronic and Structural Properties of Oxides
- Dielectric materials and actuators
- Multiferroics and related materials
- Advanced ceramic materials synthesis
- Advanced Sensor and Energy Harvesting Materials
- Dielectric properties of ceramics
- Semiconductor materials and devices
- Photorefractive and Nonlinear Optics
- Boron and Carbon Nanomaterials Research
- High-pressure geophysics and materials
- Ultrasonics and Acoustic Wave Propagation
- Advancements in Solid Oxide Fuel Cells
- Advanced MEMS and NEMS Technologies
- Nuclear materials and radiation effects
- Additive Manufacturing and 3D Printing Technologies
- Glass properties and applications
- Advanced materials and composites
- Microstructure and mechanical properties
- Photopolymerization techniques and applications
- Metal and Thin Film Mechanics
- Ultrasound Imaging and Elastography
- X-ray Diffraction in Crystallography
Rutgers, The State University of New Jersey
2014-2025
Abstract 3D printing (3DP) technologies have transformed the processing of advanced ceramics for small‐scale and custom designs during past three decades. Simple complex parts are designed manufactured using 3DP structural, piezoelectric, biomedical applications. Manufacturing simple or geometries one‐of‐a‐kind components without part‐specific tooling saves significant time creates new applications ceramic materials. Although development innovations in far behind compared with metals...
In the last 25 years, piezoelectric ceramic-polymer composites have been conceptualized, prototyped, fabricated, and implemented in an array of applications encompassing medical imaging military missions, among others. A detailed snapshot materials used, a account major innovative methods developed making various are presented. The salient aspects processing such summarized, structure-processing-property relations described using connectivity as unifying central concept. Computer-aided...
We study the temperature dependence of dielectric constant (K) and spontaneous polarization (Ps) in range −95–200°C. Cubic (C)-tetragonal (T) T-orthorhombic (O) transitions are observed at 264 25°C, respectively. The Curie–Weiss C-T transition is 249°C, indicating it first order. X-ray data indicate T-O phase coexistence 25°C. A singularity Ps 25°C a spanning 25–31°C was observed, wherein increases from 17×10−2C∕m2 31°Cto23×10−2C∕m2 appears diffusionless polymorphic with martensite start...
Electromechanical properties of a number ferroelectric films including PbZrxTi1−xO3(PZT), 0.9PbMg1/3Nb2/3O3–0.1PbTiO3(PMN-PT), and SrBi2Ta2O9(SBT) are investigated using laser interferometry combined with conventional dielectric measurements. Effective electrostriction coefficients the films, Qeff, determined linearized equation that couples longitudinal piezoelectric coefficient, d33, polarization constant. It is shown that, in PZT slightly increase applied electric field, reflecting weak...
Abstract The kinetics of polymers pyrolysis, particularly those containing ethoxylated trimethylolpropane triacrylate ((EtO) 3 ‐TMTPA), is utmost importance in optimizing the binder removal process that associated with ceramic vat photopolymerization (CerVPP). Here, we focus on decomposition a simplified resin, which photopolymer system formulated from (EtO) ‐TMTPA and photoinitiator (diphenyl(2,4,6‐trimethylbenzoyl) phosphine oxide). thermal behavior resin was critically assessed use...
The spontaneous polarization (Ps) and strains (xi) in mechanically unclamped surface charge compensated PbTiO3 nanocrystals were determined as a function of particle size the range <150nm by differential scanning calorimetry x-ray powder diffraction, respectively. Significant deviations from bulk order parameters (P,xi) have been observed decreased below ∼100nm. critical (rc) which ferroelectric tetragonal phase transforms to paraelectric cubic was ∼15nm. depression transition...
Single phase, epitaxial, ⟨001⟩ oriented, undoped and 1mol% Mn-doped (K0.44,Na0.52,Li0.04)(Nb0.84,Ta0.10,Sb0.06)O3 thin films of 400nm thickness were synthesized on SrRuO3 coated SrTiO3. Such exhibit well saturated hysteresis loops have a spontaneous polarization (Ps) 10μC∕cm2, which is 150% higher over the Ps composition. The coercive field Mn doped 13kV∕cm. Mn-doping results in three orders magnitude decrease leakage current above 50kV∕cm electric field, we attribute to suppression...
Piezoelectric ceramic-polymer composites have been conceptualized, prototyped, fabricated by rapid prototyping in order to surpass those with traditional processing methods novelty as well performance. Rapid offers unmatched design and fabrication flexibility achieving structural complexity hierarchy developing piezoelectric composites. A detailed account of all salient aspects Fused Deposition Ceramics (FDC) Multi-Materials (FDMM), two major technologies pioneered at Rutgers University, are...
We report the growth of single-phase (K0.44,Na0.52,Li0.04)(Nb0.84,Ta0.10,Sb0.06)O3 thin films on SrRuO3 coated ⟨001⟩ oriented SrTiO3 substrates by using pulsed laser deposition. Films grown at 600°C under low fluence exhibit a textured columnar grained nanostructure, which coalesce with increasing deposition temperature, leading to uniform fully epitaxial highly stoichiometric film 750°C. However, deposited lower temperatures compositional fluctuations as verified Rutherford backscattering...
Nonisothermal densification in 8% yttria doped zirconia (8YSZ) particulate matter of 250 nm median particle size was studied under 215 V/cm dc electric field and 9 °C/min heating rate, using time-resolved in-situ high temperature energy dispersive x-ray diffractometry with a polychromatic 200 keV synchrotron probe. Densification occurred the 876–905 °C range, which resulted 97% theoretical density. No local melting at particle-particle contacts observed scanning electron micrographs,...
We have studied the evolution of anisotropic epitaxial strains in ⟨110⟩-oriented (Ba0.60Sr0.40)TiO3 paraelectric (m3m) thin films grown on orthorhombic (mm2) ⟨100⟩-oriented NdGaO3 by high-resolution x-ray diffractometry. All six independent components three-dimensional strain tensor were measured with 25–1200-nm thickness, from which principal stresses and obtained. Pole figure analysis indicated that relations are [001]m3m‖[001]mm2 [1¯10]m3m‖[010]mm2 plane film, [110]m3m‖[100]mm2 along...
Abstract A concise overview of ferroelectric ceramics and composites, which constitute the backbone transducer applications such as actuators, sensors, energy harvesting, storage are provided. For piezoelectric composites based on ceramics, underlying principles developed using linear equations state for piezoelectricity concepts crystalline anisotropy, symmetry, composite connectivity, form factor engineering unifying themes. Emphasis is given to diphasic have revolutionized in fields sonar...
Abstract Stereolithography of ceramics remains one the most powerful additive manufacturing routes for creation intricate ceramic parts. Despite its utility as a forming tool, stereolithography requires challenging debinding stage due to requisite high polymeric loading. Earlier research has identified both resin composition and atmosphere be crucial factors in improving performance. Here, we use combination thermogravimetric analysis neutron imaging examine samples different compositions...
In-plane dielectric properties of ⟨110⟩ oriented epitaxial (Ba0.60Sr0.40)TiO3 thin films in the thickness range from 25–1200nm have been investigated under influence anisotropic strains ⟨100⟩ NdGaO3 substrates. The measured show strong residual strain and in-plane directional dependence. Below 150nm film thickness, there appears to be a phase transition due nature misfit relaxation. relative permittivity is found vary as much 500–150 along [11¯0] [001] respectively, 600nm thick films, 75 500...
Abstract K 0.5 Na NbO 3 (KNN) of 4‐μm average particle size was flash sintered in parallel plate capacitor configuration (PPCC) under 100 V/mm (0.8 mA/mm 2 cut‐off) with 10°C/min heating rate air. Precipitous densification occurred from T f = 662–670°C ( –furnace temperature) 60 s 55 mW/mm peak power absorption at 667°C, resulting 98% dense ceramic < 5‐μm grains size. No grain growth observed. A cubic morphology inherited the starting KNN powder. sign liquid phase formation on boundaries...
Strain relaxation in (Ba0.60Sr0.40)TiO3 (BST) thin films on ⟨110⟩ orthorhombic NdGaO3 substrates is investigated by x-ray diffractometry. Pole figure analysis indicates a [010]BST∥[1¯10]NGO and [001]BST∥[001]NGO in-plane [100]BST∥[100]NGO out-of-plane epitaxial relationship. The residual strains are relaxed at h∼200nm, for h&gt;600nm, essentially strain free. Two independent dislocations mechanisms operate to relieve the anisotropic misfit along principal directions. critical thickness...
We propose a phenomenological intrinsic finite-size effect model for single domain, mechanically free, and surface charge compensated PbTiO3 (PT) nanocrystals with no depolarization fields, undergoing first-order tetragonal→cubic ferrodistortive phase transition. then derive Landau-Devonshire type free-energy functional, which is commensurate the solution of equation polar point group 4mm, wherein nanoparticle size (ξ) variable. By using experimental particle size-dependent spontaneous...
Heteroepitaxial Ba 0.6 Sr 0.4 TiO 3 films were deposited on (100) LaAlO and MgO substrates via pulsed laser deposition. Film thickness varied from 22 nm to 1.15 w m. All examined with x-ray diffraction cross-section FESEM determine both epitaxy thickness, stoichiometry was confirmed RBS measurements. Microwave dielectric measurements carried out in the range of 1-20 GHz, using an interdigitated electrode array. The state strain as a function substrate type correlated observed capacitive...