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Search Publications by: Virgil Provenzano (Assoc)

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Displaying 1 - 24 of 24

Self-Assembled Multiferroic Nanostructures in CoFe 2 O 4- PbTiO 3 System

October 12, 2021
Author(s)
Jiying Li, Igor Levin, Julia Slutsker, Virgil Provenzano, Peter K. Schenck, J.H. Yang, Alexander L. Roytburd
The effect of substrate orientation of the morphologies of epitaxial self-assembled nanostructures was demonstrated using newly synthesized multiferroic 0.67PbTiO3-0.33CoFe2O4 nanocomposite thin films. The two-phase nanostructures were grown on single

Using Terahertz Waves to Identify the Presence of Goethite via Antiferromagnetic Resonance

April 24, 2017
Author(s)
Edward J. Garboczi, David F. Plusquellic, Robert D. McMichael, Virgil Provenzano, Paul E. Stutzman, Jack T. Surek, Shin G. Chou, Shuangzhen Wang
Virtually every corrosion detection method reports only the presence of a material phase denoting probable corrosion, not its spectral signature. A signature specific to the type of iron oxide corrosion would not only confirm the presence of corrosion but

Gd(sub 90)Co(sub 2.5)Fe(sub 7.5) Alloy Displaying Enhanced magnetocaloric Properties

July 3, 2015
Author(s)
Virgil Provenzano, Robert D. Shull, G Kletetschka, Paul E. Stutzman
Because of its attractive magnetocaloric properties, gadolinium (Gd) metal is currently the refrigerant of choice in the development of near-room temperature magnetic cooling prototypes (refrigerators, heat pumps, and air conditioners). The overwhelming

Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique

January 11, 2014
Author(s)
Edward J. Garboczi, Paul E. Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F. Plusquellic, Jack T. Surek, Sung Kim, Robert D. McMichael, Mark D. Stiles, Ahmed M. Hassan
Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectroscopic

Measurement and Simulation of Millimeter Wave Scattering Cross-sections from Steel-Reinforced Concrete

January 11, 2014
Author(s)
Ahmed M. Hassan, Edward Garboczi, Robert McMichael, Jack T. Surek, Mark D. Stiles, David F. Plusquellic, Virgil Provenzano, Paul E. Stutzman, Shuangzhen S. Wang, Sung Kim, Michael D. Janezic, Jason Coder, Nicos Martys, David R. Novotny
Some iron oxide corrosion products exhibit antiferromagnetic magnetic resonances (AFMR) at around 100 GHz at normal temperatures. AFMR can be detected in laboratory conditions, which serves as the basis for a new non-destructive spectroscopic method for

Ferri- to ferro-magnetic transition in the martensitic phase of a Heusler alloy

September 15, 2012
Author(s)
Robert D. Shull, Lawrence H. Bennett, Virgil Provenzano, Y. N. Jin, Igor Levin, E. Della Torre
During the past decade the magnetic properties of Heusler alloys have been extensively studied, motivated in part by the observation of large magnetocaloric effect (MCE) peaks displayed by these alloys near room temperature. We present new data and

Electromagnetic Properties of Iron Oxide Corrosion Product Powders at Radio Frequencies

July 1, 2012
Author(s)
Sung Kim, Jack T. Surek, James R. Baker-Jarvis, Virgil Provenzano
We calculated the refractive index from Sparameter data for corrosion samples tested in waveguide from 12.4 GHz to 110 GHz. This approach minimizes the modal noise often seen in derived permittivity and permeability for low-loss samples in this range. Also

Direct Measurement of the Magnetocaloric Effect in Gd_5}Si_2}Ge_1.9}Ga_0.1}

March 19, 2010
Author(s)
E. N. Palacios, G. F. Wang, R. Burriel, Virgil Provenzano, Robert D. Shull
Doping with some metals (Fe, Cu, Ga, Mn, Al) reduces or removes the strong thermal hysteresis in the giant magnetocaloric alloys Gd_5}Si_x}Ge_1-x}_4}. We present heat capacity and direct measurements of the isothermal entropy change, ¢ST , and adiabatic

Magnetic Properties of Zr_(9)Ni_(11)Intermetallic Compound

February 7, 2010
Author(s)
Virgil Provenzano, Robert D. Shull, Richard M. Waterstrat, Lawrence H. Bennett, Edward Della Torre, H. Seyoum
We report on a very interesting magnetic behavior in the intermetallic compound Zr_(9)Ni_(11), namely, (i) spin-glass behavior and (ii) fluctuations in magnetization versus temperature curves. The magnetic properties are consistent with structural results

Subsolidus Phase Equilibria and Properties in the Magnetic Dielectric System Bi 2 O 3 :Mn 2 O 3+x :Nb 2 O 5

July 20, 2006
Author(s)
Terrell A. Vanderah, M W. Lufaso, A U. Adler, Igor Levin, Juan C. Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Subsolidus phase relations have been determined for the Bi-Mn-Nb-O system in air (750-900 C). Phases containing Mn2+, Mn3+, and Mn4+ were all observed. Ternary compound formation was limited to pyrochlore, which formed a substantial solid solution region

Phase Formation, Crystal Chemistry, and Properties in the Magnetic Dielectric System Bi 2 O 3- Fe 2 O 3- Nb 2 O 5

June 22, 2006
Author(s)
M W. Lufaso, Terrell A. Vanderah, I M. Pazos, Igor Levin, Juan C. Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Subsolidus phase relations have been determined for the Bi2O3-Fe2O3-Nb2O5 system in air (900-1075 C). Three new ternary phases were observed Bi3Fe0.5Nb1.5O9 with an Aurivillius-type structure, and two phases with approximate stoichiometries Bi17Fe2Nb31O106

The Effects of Small Metal Additions (Co, Cu, Ga, Mn, Al, Bi, Sn) on the Magnetocaloric Properties of the Gd 5 Ge 2 Si 2 Alloy

April 26, 2006
Author(s)
Robert D. Shull, Virgil Provenzano, Alexander J. Shapiro, A Fu, M W. Lufaso, E Karapetrova, G Kletetschka, V Mikula
It was shown that adding one atomic percent Fe to Gd5Ge2Si2 greatly reduced its large hysteresis losses, broadened the magnetic entropy change, ?Sm, versus temperature, T, peak, and shifted the ?Sm peak value from 275 K to 305 K[1]. The present paper

Structure and Magnetocaloric Properties of the Fe-Doped HoTiGe Alloy

April 20, 2006
Author(s)
Virgil Provenzano, B Baumgold, Robert D. Shull, Alexander J. Shapiro, Keiichi Koyama, Kazuo Watanabe, N K. Singh, K G. Suresh, A K. Nigam, S K. Malik
The structure and magnetocaloric properties of the Fe-doped HoTiGe compound were investigated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD), superconducting quantum interference device (SQUID)

High Field X-Ray Diffraction Studies on Gd 5 (Ge 2-x Fe x )Si 2 (x = 0.05 and 0.2)

September 15, 2005
Author(s)
Jim L. Her, Keiichi Koyama, Kazuo Watanabe, Virgil Provenzano, F Fu, Robert D. Shull
We performed the X-ray diffraction measurements in magnetic fields up to 5 T for Gd5(Ge1.95Fe0.05)Si2 and Gd5(Ge1.8Fe0.2)Si2 which are noted recently as related materials for magnetic refrigerants. With heating from 8 K, the matrix of Gd5(Ge1.95Fe0.05)Si2

Peak Magnetocaloric Effects in Al-Gd-Fe Alloys

June 1, 2004
Author(s)
Virgil Provenzano, Alexander J. Shapiro, T T. King, E R. Canavan, P Shirron, M J. DiPirro, Robert D. Shull
The magnetocaloric properties of several AlxGdyFez (with x+y+z=100) ternary alloys have been determined between 2-300 K. Three distinct peaks in the magnetic entropy change Sm vs T were found: a low temperature peak (near 10 K), an intermediate temperature
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