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The existence of depolarization fields in thin ferroelectric films is experimentally demonstrated by investigating an unconventional electrode-ferroelectric configuration consisting of a triglycine sulphate (TGS) film sandwiched between a gold and a doped-silicon electrode. Due to nonidentical electrodes, the compensa…
The phonon dispersion relations of ZrC, NbC, HfC, TaC, and UC are investigated using a phenomenological-model theory. For the transition-metal carbides, a shell model with a free-electron screening is used to describe the over-all shape of the phonon curves. The results strongly support the "covalent model," where the…
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Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation E. A. Nesbitt, J. H. Wernick, T. R. McGuire; Rare Earth Permanent Magnets. Physics Today 1 December 1973; 26 (12): 59–60. https://doi.org/10.1063/1.3128366 Download citation file: Ris (Zotero) Reference Manag…
Electrical conduction in polymers under a relatively low applied electric field is considered to be ionic and is affected strongly by the structural factors of the polymers. The following equation for the electrical conductivity σ was derived in which free volume Vf, jump energy Ej, and ionic dissociation energy W wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of nickel compoundsJ. Matienzo, Lo I. Yin, Samue O. Grim, and William E. Swartz Jr.Cite this: Inorg. Chem. 1973, 12, 12, 2762–2769Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published inissue 1 Decem…
Intense broadband emission in the visible is observed from crystals of Bi4Ge3O12 under optical and x-ray excitation. From measurements of absorption, reflection, fluorescence, and excitation spectra, the emission is assigned to 3P1 → 1S0 transitions of Bi3+. The Stokes shift is large, [inverted lazy s]14 000 cm−1. The…
Summary Three groups of minerals are discussed, which are typified by pyroaurite and sjögrenitc, hydrocalumite, and ettringite. All show interesting structural features. In the pyroaurite-sjögrenite group, brucite-likc layers carrying a net positive charge alternate with layers in which the oxygen atoms of carbonate g…
Abstract Edwards’s equilibrium theory of rubber elasticity is used to study the effect on the network elasticity of the consecutive addition and removal of cross-links under different strains. The treatment is compared with those of Flory, Scanlan and others based on classical rubber elasticity theory. For a composite…
Abstract : The physical-chemical thermal and optical properties of Bi2Te3 and solid solutions based on it are reviewed, as are the influences of defects and impurities. The technology of these materials is surveyed. The mobility and scattering mechanism of the charge carriers and the band structure are discussed. Ther…
The concepts involved in Frank's [1] formula and the treatment of surface dislocations by Bilby et al. [4] are combined to develop a vector equation for the closure failure associated with a boundary between crystals with different lattice parameters. The relation between the extended Frank's formula and Bollmann's wo…
The dispersion of the dielectric constant of triglycine sulphate (TGS) is investigated in detail by measurements up to 10 GHz. The dispersion can be well described by a Debye equation. The characteristic relaxation frequency f̃o=fσ (σs-σ∞) shows only in the ferroelectric region an evident temperature dependence. The e…
The conductivity of pure and doped (Mo, Ti) V2O5 single crystals is measured along the three crystallographic directions in the temperature range 90 to 350° K. For T < 140° K, it is shown that conduction can be considered as a variable range hopping between defect levels, situated in the neighbourhood of the Fermi-lev…