Carlos Suchicital

Virginia Tech

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Electric field‐induced piezoelectricity in polymer film

Journal of Applied Polymer Science (1975)

R.L. Zimmerman Carlos Suchicital E. Fukada

Abstract An apparatus is devised for measuring the real and imaginary components of the piezoelectric strain constant d = d ′ − id ″ for polymer films with a d.c. bias field. Electric fieldinduced piezoelectricity is observed for films of several types of polymer. The ratio of the piezoelectric constant to the d.c. bias field gives (ϵ + κ)/ G where ϵ is the dielectric constant, κ is the electrostriction constant, and G is the elastic constant. The temperature dependence of the field‐induced piezoelectricity gives, therefore, combined information of dielectric and elastic properties of polymers. After heating to about 95°C followed by cooling to room temperature, maintaining a constant d.c. basis on a poly(vinyl chloride) film, piezoelectricity is observed at null d.c. field, which suggests the introduction of a residual polarization in the films.

Electrostriction

10.1002/app.1975.070190517

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Citations (24)

Chemical and Structural Evolution of Sol‐Gel‐Derived Hydroxyapatite Thin Films under Rapid Thermal Processing

Journal of the American Ceramic Society (1996)

Stephen W. Russell Karen A. Luptak Carlos Suchicital T. L. Alford Vincent Pizziconi

Chemical and structural evolution of hydroxyapatite thin films produced by sol‐gel synthesis is characterized by ion beam analysis, X‐ray diffraction, and Fourier transform infrared spectroscopy. Formation of the hydroxyapatite structure began at 500°C; no other phases were observed at higher temperatures. Elimination of residual organics was observed in the form of the disappearance of excess oxygen, hydrogen and carbon. Crystal size increases with increasing anneal temperature; spectroscopy indicates the formation of highly crystalline films. The analytical methods chosen provide insight into subtle chemical and structural changes which occur in films produced by this synthetic route.

Carbon fibers

10.1111/j.1151-2916.1996.tb08514.x

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Citations (86)

Thermal management of high-power electronics modules packaged with interconnected parallel plates

S. Haque Kexin Xing Carlos Suchicital D.J. Nelson Gao Qing Lu

The Virginia Power Electronics Center at Virginia Tech has developed a low cost approach for packaging of power electronics building blocks (PEBB) consisting of power semiconductor devices, drivers, controls, sensors and protection circuits for a wide range of power electronics applications, such as inverters for motor drives and converters for power processing equipment. The new concept of PEBB packaging, termed metal posts interconnected parallel plate structure (MPIPPS), is based on direct bonding of copper posts to interconnect power devices, thus eliminating wire-bonding with aluminum wires. The interior space between the parallel plates and copper posts can be used as a flow channel for heat dissipation by a dielectric fluid, or filled with a solid or liquid for additional heat spreading. This approach requires less expensive processing equipment and has the potential to produce cost-effective high power modules that have superior electrical, thermal, and mechanical performance. This paper presents the materials selection and fabrication techniques developed in the course of the research and initial electrical and thermal characterization of the MPIPPS structure.

Power Electronics

Power module

Electronic Packaging

10.1109/stherm.1998.660395

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Citations (13)

Crystal Growth, Phase Transformation Studies, and Micro-Cracking in Single Crystal Lead Titanate

Carlos Suchicital David A. Payne Alain Grandin de L'éprevier

Crystal (programming language)

Lead titanate

Lead (geology)

10.1109/isaf.1986.201182

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Citations (2)

Multiferroic epitaxial Pb(Fe1∕2Nb1∕2)O3 thin films: A relaxor ferroelectric/weak ferromagnet with a variable structure

Applied Physics Letters (2006)

Liqin Yan Jiefang Li Carlos Suchicital D. Viehland

The authors report the structural, ferroelectric, and ferromagnetic properties of Pb(Fe1∕2Nb1∕2)O3 epitaxial thin layers grown on (001), (110), and (111) SrTiO3 substrates by pulsed-laser deposition; films were of sufficient resistivity to enable high-field P-E measurements. Findings are as follows: epitaxial strain results in (i) a dramatic increase in the spontaneous polarization Ps; (ii) a lattice structure that is dependent on substrate orientation; (iii) a slim-loop P-E response and relaxor ferroelectric characteristics in the dielectric constant, both of which are nearly independent of crystallographic orientation; and (iv) a weak ferromagnetic moment, which is dependent on epitaxial mismatch.

Pulsed Laser Deposition

Lattice constant

10.1063/1.2357926

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Citations (23)

Variable Frequency Microwave (VFM) Processing: A New Tool to Crystallize Lithium Disilicate Glass

Ceramic engineering and science proceedings (2008)

Morsi Mahmoud D. C. Folz Carlos Suchicital David E. Clark Z. Fathi

The goal of this work is to use variable frequency microwave processing to crystallize lithium disilicate glass (Li2Si2O5) into a glass-ceramic material. Variable frequency microwave (VFM) processing significantly reduces the time required for crystallizing lithium disilicate glass into a glass-ceramic in comparison to conventional processing. Moreover, VFM permits more uniform heating and precise control of microwave energy over fixed frequency techniques. The Li2Si2O5 glass system provides the basis for a large number of commercially successful glass-ceramic products, such as cookware, radomes, ceramic composites. stovetops and dental crowns. A new generation of dental crowns based on this composition provides a driving force for developing more efficient processing methods.

Lithium disilicate

Glass-ceramic

10.1002/9780470291351.ch14

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Citations (6)

Microstructural evolution in silica aerogel

Journal of Non-Crystalline Solids (2007)

Carlos Eduardo Folgar D. C. Folz Carlos Suchicital David E. Clark

Gas pycnometer

Liquid nitrogen

10.1016/j.jnoncrysol.2007.02.047

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Citations (51)

Molecular engineering of phase transition temperatures in dodecasil-3C clathrasils

Hee K. Chae W. G. Klemperer David A. Payne Carlos Suchicital

Single crystals of the dodecasil-3C clathrasils 17SiO/sub 2/-M (M=cyclohexane, cyclopentane, piperidine, pyrrolidine, cyclopentylamine, and cyclobutylamine) were grown using hydrothermal techniques. The influence that the organic guest molecule in a given silica host framework has on the bulk properties of the clathrasil was demonstrated. Each material displayed two phase transitions, one between 59 and 180 degrees C and the other between -110 and -1 degrees C. These phase transition temperatures could be systematically varied by varying the size of the guest molecule.< >

Cyclopentanes

Piperidine

Pyrrolidine

Morpholine

10.1109/isaf.1990.200297

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Citations (0)

Temperature and stoichiometry effect on microstructural and ferroelectric properties of Pb(Zr1-xTix)O3 thin films prepared by chemical soulution deposition

Ceramic transactions /Ceramic transactions (2004)

C.R. Foschini J. F. Li Carlos Suchicital D. Viehland B.D. Stojanović

Stoichiometry

Deposition