Sr and Ba substitution in charge ordered Pr0.5Ca0.5MnO3: Sharp steps in the magnetic and transport properties for a narrow composition range

2006 ◽  
Vol 100 (2-3) ◽  
pp. 472-476
Author(s):  
Deliang Zhu ◽  
Peijiang Cao ◽  
Wenjun Liu ◽  
Xiaocui Ma ◽  
Xiaojun Bai ◽  
...  
Keyword(s):  
Transport Properties ◽  
Composition Range ◽  
Narrow Composition Range ◽  
Ba Substitution

scholarly journals Протонпроводящие композиционные материалы на основе соединения Cs-=SUB=-6-=/SUB=-H(HSO-=SUB=-4-=/SUB=-)-=SUB=-3-=/SUB=-(H-=SUB=-2-=/SUB=-PO-=SUB=-4-=/SUB=-)-=SUB=-4-=/SUB=-

2019 ◽  
Vol 61 (12) ◽  
pp. 2375
Author(s):  
В.А. Коморников ◽  
В.В. Гребенев ◽  
И.С. Тимаков ◽  
О.Б. Зайнуллин
Keyword(s):  
Impedance Spectroscopy ◽  
Transport Properties ◽  
Phase Analysis ◽  
Composition Range ◽  
Scanning Microscopy ◽  
Proton Conducting ◽  
X Ray ◽  
Conducting Materials ◽  
Electron Scanning Microscopy

Composite proton-conducting materials xCs6H (HSO4) 3 (H2PO4) 4+ (1 - x) AlPO4 were obtained in the composition range (x = 0.9–0.7). The methods of x-ray phase analysis, impedance spectroscopy, electron scanning microscopy studied their physicochemical and transport properties.

Magnetic and magneto-transport properties of NdBaCuO single crystals with varying Nd/Ba substitution and oxygen content

2001 ◽  
Vol 364-365 ◽  
pp. 320-325 ◽  
Author(s):  
N Koshizuka ◽  
A.K Pradhan ◽  
S Shibata ◽  
Y Feng ◽  
T Machi ◽  
...  
Keyword(s):  
Transport Properties ◽  
Single Crystals ◽  
Oxygen Content ◽  
Ba Substitution

scholarly journals Transport properties and intermolecular interactions in binary mixtures based on the protic ionic liquid ethylimidazolium triflate and ethylene glycol

2018 ◽  
Vol 20 (35) ◽  
pp. 22980-22986 ◽  
Author(s):  
Negin Yaghini ◽  
Iqbaal Abdurrokhman ◽  
Mohammad Hasani ◽  
Anna Martinelli
Keyword(s):  
Ionic Liquid ◽  
Binary Mixture ◽  
Ethylene Glycol ◽  
Transport Properties ◽  
Binary Mixtures ◽  
Intermolecular Interactions ◽  
Composition Range ◽  
Protic Ionic Liquid

The binary mixture based on the protic ionic liquid (PIL) ethylimidazolium triflate (C2HImTfO) and the diol compound ethylene glycol (EG) has been investigated in the whole composition range from pure PIL to pure EG.

Thermoelasticity and Stress Induced Crystallization of EPDM Elastomers

1971 ◽  
Vol 44 (4) ◽  
pp. 1093-1108 ◽  
Author(s):  
U. Flisi ◽  
A. Valvassori ◽  
G. Novajra
Keyword(s):  
Thermodynamic Properties ◽  
Composition Range ◽  
Amorphous Polymers ◽  
Microstructural Parameter ◽  
Sequence Distribution ◽  
Monomer Sequence ◽  
Stretching Ratio ◽  
Narrow Composition Range ◽  
Stress Induced Crystallization ◽  
Induced Crystallization

Abstract The thermoelastic behavior of various EPDM rubbers has been investigated by performing stress-temperature measurements at different stretching ratios in order to determine their thermodynamic properties and the occurrence of stress induced crystallization. A broad range of terpolymer compositions was investigated and the regularity of monomer sequence distribution was also taken into account. It has been found that statistical terpolymers, like the commercial ones, are generally amorphous and hardly crystallize under stretching for propylene contents higher than 40% by weight. Below this level it is possible to obtain, in a narrow composition range, amorphous polymers that can crystallize under stretching, provided that their monomer sequence distribution is regular enough. The influence of this microstructural parameter has been studied by testing a 3/1 ethylene/propylene model copolymer, obtained by hydrogenation of a sample of poly-3-methyloctenamer. Studying the influence of stretching ratio on crystallization temperature of standard EPDM rubbers, it has been noticed that crystallization occurs at low elongation, which might be related to the presence of “nuclei” in the undeformed state.

High-Ti magnetite in some fine-grained carbonatites and the magmatic implications

2002 ◽  
Vol 66 (3) ◽  
pp. 379-384 ◽  
Author(s):  
D. K. Bailey ◽  
S. Kearns
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Composition Range ◽  
Volcanic Rocks ◽  
Coarse Grained ◽  
Slow Cooling ◽  
Fine Grained ◽  
Narrow Composition Range ◽  
Fast Quenching ◽  
Temperature Crystallization

AbstractMagnetite is present in most carbonatites, and in the most abundant and best-known form of carbonatite, coarse-grained intrusions, it typically falls in a narrow composition range close to Fe3O4. A fine-grained carbonatite from Zambia contains magnetites with an extraordinary array of compositions (from 18–1% TiO2, 10–2% Al2O3, and 16–4% MgO) outranging previously-reported examples. Zoning trends are from high TiO2 to high Al2O3 and MgO. No signs of exsolution are seen. Checks on similar rocks from Germany, Uganda and Tanzania reveal magnetites with comparable compositions, ranges, and zoning. Magnetites from alkaline and alkaline ultramafic silicate volcanic rocks cover only parts of this array. Magnetite analyses from some other fine-grained carbonatites, reported in the literature, fall in the same composition field, suggesting that this form of carbonatite may be distinctive. The chemistry and zoning would be consonant with rapid high-temperature crystallization in the carbonatite melts, with the lack of exsolution pointing to fast quenching: this contrasts with coarse-grained intrusive carbonatites, in which the magnetite compositions are attributed to slow cooling, with final equilibration at low temperature. In some complexes, both forms of carbonatite, with their different magnetite compositions, are represented.

Composition Range of Morphotropic Phase Boundary and Electrical Properties of NBT-BT System

2007 ◽  
Vol 336-338 ◽  
pp. 206-209 ◽  
Author(s):  
Ye Jing Dai ◽  
Jin Song Pan ◽  
Xiao Wen Zhang
Keyword(s):  
Dielectric Properties ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Composition Range ◽  
Rhombohedral Phase ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Air Atmosphere ◽  
Unique Composition ◽  
Narrow Composition Range

(Na0.5Bi0.5)TiO3 (BNT) system ceramics are considered to be an excellent candidate for leadfree piezoelectric ceramics. In this paper, (1–x)Na0.5Bi0.5TiO3-xBaTiO3 (x = 0.03 ~ 0.10) was synthesized by conventional mixed-oxide technique. The powders were calcined at 950oC for 2 h and the pressed disks were sintered at 1145oC for 2 h in air atmosphere. The phase structure was investigated by X-ray diffraction technique (XRD). It is revealed that the morphotropic phase boundary (MPB) lies in a narrow composition range of x=0.05–0.08 but not a unique composition (x = 0.055 or 0.06) as shown before [1-4]. The microstructures of the ceramics were investigated by scanning electron microscopic. In addition, the piezoelectric and dielectric properties of this system were also investigated. It was indicated that both the piezoelectric and dielectric properties are better with the compositions lie near the tetragonal phase within the MPB than that whose compositions lie near the rhombohedral phase.

scholarly journals Binary and ternary interstitial alloys - II. The iron-carbon-nitrogen system

1948 ◽  
Vol 195 (1040) ◽  
pp. 41-55 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Composition Range ◽  
Ternary Diagram ◽  
Iron Nitrides ◽  
Concentration Limit ◽  
Iron Carbides ◽  
X Ray ◽  
Carbon And Nitrogen ◽  
Phase Fields ◽  
Narrow Composition Range

Chemical and X-ray investigation of the reaction of carbon monoxide with iron nitrides and of the reaction of ammonia with iron carbides discloses the existence of iron carbonitrides— a series of new ternary interstitial alloys containing iron, carbon and nitrogen. ζ-phase carbonitrides, with structures similar to those of ζ-iron nitrides, have a range of homogeneity extending approximately from Fe 8 N 4 to Fe 8 C 3 N. The latter is isomorphous with Fe 2 N. Є-phase carbonitrides, which are isomorphous with Є-iron nitrides, have a composition range of approximately 25 to 33 atomic % nitrogen plus carbon, i.e. from Fe 3 X to Fe 2 X , in which the higher carbon concentration limit is not less than 16 atomic %. Probable phase fields for part of the iron-carbon-nitrogen system are given on a ternary diagram. Prolonged reaction of carbon monoxide with iron nitrides results in complete elimination of nitrogen. Below 500° C the product is a carbide of iron, now called iron percarbide, the narrow composition range of which includes Fe 20 C 9 . Above 500° C the product of the same reaction is cementite.

Sign in / Sign up

Export Citation Format

Share Document