Now showing items 274-293 of 362

    • Raman spectroscopic study of Na1/2Bi1/2TiO3-x%BaTiO3 single crystals as a function of temperature and composition 

      Luo, Liang; Ge, Wenwei; Li, Jiefang; Viehland, Dwight D.; Farley, Charles; Bodnar, Robert J.; Zhang, Qinhui; Luo, Haosu (American Institute of Physics, 2011-06-01)
      A Raman spectroscopic study of Na1/2Bi1/2TiO3-x%BaTiO3 (NBT-x%BT) single crystals with x=0 and 5.6 has been performed as a function of temperature from 25 to 600 degrees C. The general features of the Raman spectra for the ...
    • Reactive ion etching of ferroelectric SrBi2TaxNb2-xO9 thin films 

      Desu, Seshu B.; Pan, Wei (AIP Publishing, 1996-01-01)
      Ferroelectric SrBi2TaxNb2-xO9 thin films were patterned using reactive ion etching. Considering the environmental impact effect, CHCIFCF3, a special etching gas, known to be less environmentally hazardous compared to the ...
    • Reactive ion etching of lead zirconate titanate and ruthenium oxide thin films 

      Cedraeus Incorporated; Virginia Tech Intellectual Properties, Inc.; Sharp Kabushiki Kaisha; Desu, Seshu B.; Pan, Wei; Vijay, Dilip P. (United States Patent and Trademark Office, 1996-03-05)
      A method of reactive ion etching both a lead zirconate titanate ferroelectric dielectric and a RuO.sub.2 electrode, and a semiconductor device produced in accordance with such process. The dielectric and electrode are ...
    • Residual strain gradients in a fully stabilized zirconia sample 

      Hwang, Bing; Houska, Charles R.; Ice, Gene E.; Habenschuss, Anthony (American Institute of Physics, 1988-06-01)
      Polished and severely ground fully stabilized zirconia samples are examined using primarily x‐ray diffraction(XRD). The XRD (111) profile reflections from both samples were broadened asymmetrically compared to that of an ...
    • Resonance acoustic field position sensor 

      Dong, Shuxiang; Bai, Feiming; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2003-06-01)
      An acoustic position sensor, based on a piezoelectric-sound-resonance cavity (PSRC), is reported in which a resonance acoustic field is used as the sensing mechanism. It has been discovered that an inserted object or an ...
    • Resonant bending mode of Terfenol-D/steel/Pb(Zr,Ti)O-3 magnetoelectric laminate composites 

      Xing, Zengping; Dong, Shuxiang; Zhai, Junyi; Yan, Li; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2006-09-01)
      Resonant bending-mode Tb1-xDyxFe2-y/elastic-steel/Pb(Zr,Ti)O-3 magnetoelectric (ME) laminate composites have been investigated. An elastic-steel layer with a relatively high Q(m) significantly increases the resonant ...
    • Role of coexisting tetragonal regions in the rhombohedral phase of Na0.5Bi0.5TiO3-xat.%BaTiO3 crystals on enhanced piezoelectric properties on approaching the morphotropic phase boundary 

      Yao, Jianjun; Monsegue, Niven; Murayama, Mitsuhiro; Leng, W. N.; Reynolds, W. T.; Zhang, Qinhui; Luo, Haosu; Li, Jiefang; Ge, Wenwei; Viehland, Dwight D. (AIP Publishing, 2012-01-01)
      The ferroelectric domain and local structures of Na0.5Bi0.5TiO3-xat.%BaTiO3 (NBT-x%BT) crystals for x = 0, 4.5, and 5.5 have been investigated by transmission electron microscopy. The results show that the size of polar ...
    • The role of confinement on stress-driven grain boundary motion in nanocrystalline aluminum thin films 

      Gianola, Daniel S.; Farkas, Diana; Gamarra, Martin; He, Mo-rigen (American Institute of Physics, 2012-12-15)
      3D molecular dynamics simulations are performed to investigate the role of microstructural confinement on room temperature stress-driven grain boundary (GB) motion for a general population of GBs in nanocrystalline Al thin ...
    • Role of Nanoscale Precipitates on the Enhanced Magnetostriction of Heat-Treated Galfenol (Fe1-xGax) Alloys 

      Cao, Hu; Gehring, Peter M.; Devreugd, Christopher P.; Rodriguez-Rivera, J. A.; Li, J.; Viehland, Dwight D. (American Physical Society, 2009-03-27)
      We report neutron diffuse scattering measurements on highly magnetostrictive Fe1-xGax alloys (0.14 < x < 0.20) with different thermal treatments. This diffuse scattering scales with magnetostriction and exhibits asymmetric ...
    • Seasonal changes in morphology govern wettability of Katsura leaves 

      Kang, Hosung; Graybill, Philip M.; Fleetwood, Sara; Boreyko, Jonathan B.; Jung, Sunghwan (PLOS, 2018-09-27)
      Deciduous broad-leaf trees survive and prepare for winter by shedding their leaves in fall. During the fall season, a change in a leaf's wettability and its impact on the leaf-fall are not well understood. In this study, ...
    • Self-assembled NaNbO3-Nb2O5 (ferroelectric-semiconductor) heterostructures grown on LaAlO3 substrates 

      Wang, Zhiguang; Li, Yanxi; Chen, Bo; Viswan, Ravindranath; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2012-09-01)
      We deposited NaNbO3 (NNO)-Nb2O5 (NO) self-assembled heterostructures on LaAlO3 (LAO) to form ferroelectric-semiconductor vertically integrated nanostructures. The NNO component formed as nanorods embedded in a NO matrix. ...
    • Self-biased magnetoelectric response in three-phase laminates 

      Yang, Su-Chul; Park, Chee-Sung; Cho, Kyung-Hoon; Priya, Shashank (American Institute of Physics, 2010-11-01)
      This study reports the experimental observation and analysis of self-biased magnetoelectric (ME) effect in three-phase laminates. The 2-2 L-T mode laminates were fabricated by attaching nickel (Ni) plates and ME particulate ...
    • Sensitivity Enhancement in Magnetic Sensors Based on Ferroelectric-Bimorphs and Multiferroic Composites 

      Sreenivasulu, Gollapudi; Qu, Peng; Petrov, Vladimir; Qu, Hongwei; Srinivasan, Gopalan (MDPI, 2016-02-20)
      Multiferroic composites with ferromagnetic and ferroelectric phases have been studied in recent years for use as sensors of AC and DC magnetic fields. Their operation is based on magneto-electric (ME) coupling between the ...
    • Shear-mode magnetostrictive/piezoelectric composite with an enhanced magnetoelectric coefficient 

      Wang, Yaojin; Hasanyan, Davresh J.; Li, Jiefang; Viehland, Dwight D.; Luo, Haosu (AIP Publishing, 2012-05-01)
      A magnetoelectric (ME) laminate heterostructure consisting of two shear-mode piezoelectric Pb(Mg1/3Nb2/3)O-3-30PbTiO(3) (PMN-PT) single crystal layers, a longitudinally magnetized magnetostrictive Tb0.3Dy0.7Fe1.92 alloy ...
    • Shifting the operating frequency of magnetoelectric sensors 

      Petrie, Jonathan; Gray, David; Viehland, Dwight D.; Sreenivasulu, Gollapudi; Srinivasan, Gopalan; Mandal, Sanjay; Edelstein, Alan S. (American Institute of Physics, 2012-04-01)
      A method is presented for increasing the operating frequency of symmetric and asymmetric magnetoelectric (ME) sensors so that the operating frequency can be equal to the mechanical resonance frequency of the sensor. This ...
    • Simplifications in the x‐ray line‐shape analysis 

      Adler, Thomas; Houska, Charles R. (American Institute of Physics, 1979)
      It is shown that a Fourier series associated with the Warren‐Averbach line‐shape analysis can be fitted with only five parameters to a pair of peaks. These interrelate the Fourier coefficients and thereby provide a simplified ...
    • A simplified procedure for obtaining relative x‐ray intensities when a texture and atomic displacements are present 

      He, Baoping; Rao, Satish I.; Houska, Charles R. (American Institute of Physics, 1994-05-01)
      The orientation problem in polycrystalline cubic materials has been simplified, using fundamental relationships, so that the determination of a quantitative interrelationship between the various Bragg peak intensities is ...
    • Single Mode Air-Clad Single Crystal Sapphire Optical Fiber 

      Hill, Cary; Homa, Dan; Yu, Zhihao; Cheng, Yujie; Liu, Bo; Wang, Anbo; Pickrell, Gary (MDPI; MDPI, 2017-05-03)
      The observation of single mode propagation in an air-clad single crystal sapphire optical fiber at wavelengths at and above 783 nm is presented for the first time. A high-temperature wet acid etching method was used to ...
    • Size effects of 0.8SrBi(2)Ta(2)O(9)-0.2Bi(3)TiNbO(9) thin films 

      Zhu, Jinsong; Zhang, Xubai; Zhu, Yongfei; Desu, Seshu B. (American Institute of Physics, 1998-02-01)
      The size effects of 0.8SrBi(2)Ta(2)O(9)-0.2Bi(3)TiNbO(9) thin films, prepared by metalorganic deposition technique, were studied by determining how the ferroelectric properties vary with film thickness and grain size. It ...
    • Small dc magnetic field response of magnetoelectric laminate composites 

      Dong, Shuxiang; Zhai, Junyi; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2006-02-01)
      We have found that small long-type magnetoelectric (ME) laminate composites of magnetostrictive Tb1-xDyxFe2-y and piezoelectric Pb(Zr,Ti)O-3 are quite sensitive to small dc magnetic field (H-dc) variations, when driven by ...