tungsten bronzes
Octahedral tilting in the polar hexagonal tungsten bronzes RbNbW2O9 and KNbW2O9
... Manipulation of composition and the effect this has on both structural and electrical behaviour of solids is the foundation of solid-state and materials chemistry. Amongst structure types composed of corner-linked ...
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A site size effect in a family of unfilled ferroelectric tetragonal tungsten bronzes : Ba4R0 67Nb10O30 (R = La, Nd, Sm, Gd, Dy and Y)
... A relationship between the structural distortion, quantified by tetragonality c/a, originating from these substitutions and TC has been shown to reconcile these apparently conflicting tr[r] ...
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Manipulation of polar order in the “empty” tetragonal tungsten bronzes: Ba4 xSrxDy0 671 33Nb10O30, x = 0, 0 25, 0 5, 1, 2, 3
... Due to the rapid increase in coercive field with decreasing temperature we were unable to obtain saturated loops at much lower temperatures, unlike other “empty” TTBs such as Ba4La0.67!1[r] ...
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Relaxor to ferroelectric crossover and disruption of polar order in "empty" tetragonal tungsten bronzes
... with a frequency dependent relaxor-like peak around 473 K in undoped BNT and high temperature peak with little dispersion ≈ 593 K.77-79 BNT compounds have a complex sequence of phase tra[r] ...
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A crystal chemical framework for relaxor versus normal ferroelectric behavior in tetragonal tungsten bronzes
... Essentially however, for the purpose of this contribution, it is sufficient to note that SBN compositions exhibit incommensurate superstructure accompanied by normal ferroelectric behavi[r] ...
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Hollow Sodium Tungsten Bronze (Na0 15WO3) Nanospheres: Preparation, Characterization, and Their Adsorption Properties
... by adjusting the pH of the mixture down below 7 by adding acid, such as HCl. Thus, there were not too many hydrogen gas bubbles accumulated in the reaction system, the loss of the hydrogen gas could be suppressed, and ...
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Electron Impact Ionization Cross Sections of Tungsten Atoms and Tungsten Ions
... The tungsten (W) and tungsten based materials have been recommended as one of the materials to be used as plasma facing components for the International Thermonuclear Experimental Reactor (ITER) [1] and the ...
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Reliable Diameter Control of Carbon Nanotube Nanobundles Using Withdrawal Velocity
... biological sensing due to their superior geometric, elec- tronic, chemical, and mechanical properties [11–16]. Various methods have been developed to attach or dir- ectly grow CNTs on the apex of micro-tips, such as a ...
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Formation Condition of Fiberform Nanostructured Tungsten by Helium Plasma Exposure
... bulk tungsten, the grain size may affect the nanostructure ...of tungsten has been reported to be in the range of 1423-1973 K [18]; thus the recrystallization might take place during the ...
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Corinthian Metalworking: The Forum Area
... Is Examples of bronzes cast by the direct process are the Piraeus Kouros (Athens National Museum), the Metropolitan Horse (New York Metropolitan Museum of Art, acc..[r] ...
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CRYOGENIC TREATMENT IN ELECTRO- DISCHARGE MACHINING – A REVIEW
... They have studied the effect of copper tungsten and cryogenic copper tungsten electrode on material removal rate during electrical discharge machining of H11 tool steel a[r] ...
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The Tungsten Project : dielectronic recombination data for collisional-radiative modelling in ITER
... The Tungsten Project aims to calculate partial and total DR rate coe ffi cients for the isonuclear sequence of Tungsten.. The calculated data will be made available as and when they are [r] ...
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Synthesis of Ultra Fine Titanium Tungsten Carbide Powder from Titanium Dioxide and Ammonium Metatungstate
... an ultrasonic generator with a frequency of 20 kHz at about 358 K. The precursor powder obtained by the drying was decomposed at 1073 K for 7.2 ks in air to remove the salt components and form a ...
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Effect of tungsten on growth, biochemical constituents, molybdenum and tungsten contents in wheat
... Experimental set-up. The experiments were set up during the month of November. Three kg soil was filled in the pots of 30 cm height and 25 cm diameter. Five concentrations (3, 9, 27, 81, and 243 mg/kg) of tungsten ...
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Abrasive wear failure analysis of tungsten carbide hard facing on carbon steel blade
... Abstract. This study investigate the abrasive wear failure of tungsten carbide hardfacing on continuous digester (CD) blade (carbon steel) in an environment of sulphuric acid and ilmenite ore mixture. Comparison ...
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Particle Pinch Model of Passing/Trapped High-Z Impurity with Centrifugal Force Effect
... ZeR 0 B 0 . A new code has been developed for solving these equations. The orbit of tungsten ion is calculated with the 4th order Runge-Kutta method using eqs. (5) and (6) ne- glecting the variation of Z along the ...
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Balancing the trade : Roman cargo shipments to India
... 1991: Roman Trade: Recent Archaeological Discoveries in Western India. 1991: The Roman Bronzes from Kolhapur[r] ...
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Between Ritual and Elegance: The Perception of Chinese Ritual Bronzes in Korea
... ritual bronzes became collectibles in China at least since the Bronze Age and functioned as testimonies of understanding history from the Song dynasty onward, as well as contemporaneously made bronze vessels ...
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Perikles’ Portrait and the Riace Bronzes: New Evidence for “Schinocephaly”
... Conversely, another feature of bronze technology commonly reflected in Roman marble copies was either overlooked or misinterpreted in the past because it was not observed on extant Cla[r] ...
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Structure-property Interaction in Flux Assisted Tungsten Inert Gas Welding of Austenitic Stainless Steel
... Tungsten Inert Gas (TIG) Welding Process or Gas Tungsten arc welding (GTAW) process uses a non- consumable tungsten electrode to generate an electric arc for fusion of work-piece. The electrode is ...
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