TITLE

SrxBa1-xNb2O6-δ Ferroelectric-thermoelectrics: Crystal anisotropy, conduction mechanism, and power factor

AUTHOR(S)
Lee, Soonil; Wilke, Rudeger H. T.; Trolier-McKinstry, Susan; Shujun Zhang; Randall, Clive A.
PUB. DATE
January 2010
SOURCE
Applied Physics Letters;1/18/2010, Vol. 96 Issue 3, p031910
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Nonstoichiometric tungsten bronze-structured ferroelectric SrxBa1-xNb2O6-δ (SBN) single crystals were found to be a promising n-type thermoelectric oxide. Thermopower anomalies were observed at the phase transition temperatures, depending on the degree of reduction as well as crystal anisotropy. Above 500 K, heavily reduced SBN crystals show high thermoelectric power factors (∼20 μW/cm K2 at 516 K) with both thermopower and electrical conductivity higher parallel to the c-axis. It is noted that the power factor increases with temperature due to the semiconducting behavior with high carrier concentration. The carrier transport mechanism also varies with the degree of reduction and temperature.
ACCESSION #
47680090

 

Related Articles

  • Viscoelasticity of a protein monolayer from anisotropic surface pressure measurements. Cicuta, P.; Terentjev, E. M. // European Physical Journal E -- Soft Matter;Feb2005, Vol. 16 Issue 2, p147 

    We present a method to completely characterize the viscoelasticity of Langmuir monolayers. In contrast to existing techniques, both the compression and shear moduli are determined at the same time, in a single experiment and with a standard apparatus. This approach relies on the measurement of...

  • Magnetic Susceptibility of Quasi-One-Dimensional Ising Superantiferromagnets FeTAC and MCl2 · 2NC5H5 (M = Co, Fe): Approximation with L×∞ and L×L×∞ Chain Clusters. Yurishchev, M. A. // Journal of Experimental & Theoretical Physics;Dec2005, Vol. 101 Issue 6, p1077 

    The temperature dependence of the zero-field susceptibilities of 2D and 3D Ising lattices with anisotropic coupling is analyzed. Infinite 2D and 3D lattices are approximated, respectively, by ensembles of independent L×∞ and L×L×∞ chain clusters that are infinitely long in...

  • Viscoelastic Properties and Formation Simulation of Polyurethane-Polyacrylate Gradient Interpenetration Polymer Networks. Brovko, O. O.; Gorbach, L. A.; Sergeeva, L. M. // Polymer Journal (18181724);2009, Vol. 31 Issue 4, p299 

    Viscoelastic properties both traditional and gradient polyurethane-polyacrylate IPNs were studied. Both types of IPNs were shown to be two-phase systems inclusive considerable interphase area. It was found that GIPNs were characterized by anisotropy of viscoelastic properties specified by...

  • Crystalline and amorphous phases of a new drug. Bruni, G.; Milanese, C.; Berbenni, V.; Sartor, F.; Villa, M.; Marini, A. // Journal of Thermal Analysis & Calorimetry;Oct2010, Vol. 102 Issue 1, p297 

    The thermodynamic properties of a new antidepressant drug are studied from room temperature to 200 °C. In this range, the sample neither decompose, nor has a significant reactivity with water. When slowly heating a “fresh” sample, we may observe the following phenomena (in the...

  • Time and temperature dependence of surface relief grating formation in polymers containing azobenzene groups with different dipole moment. Veer, Padmanabh U.; Pietsch, Ullrich; Saphiannikova, Marina // Journal of Applied Physics;Jul2009, Vol. 106 Issue 1, p14909 

    We present the results of time and temperature dependent deformation of two azobenzene materials with different dipole moment during the process of surface relief grating formation. The effect of chromophore orientation on grating formation in these films was studied in situ using continuous and...

  • Entropy of glass transition and polymorphism. Bal�makov, M. D.; Blinov, L. N.; Pocheptsova, N. S. // Technical Physics Letters;Feb98, Vol. 24 Issue 2, p86 

    An analysis is made of the change in entropy in the glass transition process. It is shown that although the entropy of glass transition is less than that of melting, it is no more than two orders of magnitude smaller. The main results are obtained without using the conditions of local...

  • Reorientational dynamics of molecular liquids in confined geometries. Liu, Guoying; Li, Yu-Zhuo; Jonas, J. // Journal of Chemical Physics;5/15/1989, Vol. 90 Issue 10, p5881 

    Examines the effect of geometrical confinement on the glass transition of various molecular liquids and discusses the results obtained for reorientational dynamics of the molecular liquid of nitrobenzene-d[sub5] in a series of porous glasses. Approach used to analyze the experimental data;...

  • In situ ultrasonic measurement of photoresist glass transition temperature. Morton, Susan L.; Degertekin, F. Levent; Khuri-Yakub, B. T. // Applied Physics Letters;5/11/1998, Vol. 72 Issue 19 

    We have developed a method to measure the glass transition temperature of photoresist in situ. The purpose of photoresist prebake is to evaporate excess solvent from the photoresist and to allow the polymer chains to relax into an ordered matrix. The phase of a high frequency ultrasound signal...

  • Relation between stretched-exponential relaxation and Vogel–Fulcher behavior above the glass transition. Nagel, Sidney R.; Dixon, Paul K. // Journal of Chemical Physics;4/1/1989, Vol. 90 Issue 7, p3885 

    We point out a relationship between stretched-exponential relaxation, [lowercase_phi_synonym](t)=[lowercase_phi_synonym]0 exp[-(t/τ)β], and the Vogel–Fulcher temperature dependence, τ=τ0 exp[A/(T-T0)], seen in many glasses near the glass transition. Recent experiments have...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics