Dependence of the lattice parameter of { $$\gamma '$$ } iron nitride, Fe4N1−x , on nitrogen content; Accuracy of the nitrogen absorption datairon nitride, Fe4N1−x , on nitrogen content; Accuracy of the nitrogen absorption data

1989 ◽  
Vol 20 (8) ◽  
pp. 1533-1539 ◽  
Author(s):  
M. A. J. Somers ◽  
N. M. Pers ◽  
D. Schalkoord ◽  
E. J. Mittemeijer
Keyword(s):  
Nitrogen Content ◽  
Lattice Parameter ◽  
Iron Nitride ◽  
Nitrogen Absorption ◽  
Absorption Data ◽  
Gamma Iron

NITRIFICATION UNDER AND AFTER ALFALFA, BROME, TIMOTHY, AND WESTERN RYE GRASS: III. COMPOSITION OF HAY CROP RESIDUES

1940 ◽  
Vol 18c (4) ◽  
pp. 136-141 ◽  
Author(s):  
R. Newton ◽  
R. S. Young
Keyword(s):  
Nitrogen Content ◽  
Crop Residues ◽  
C:N Ratio ◽  
Nitrogen Absorption ◽  
Crude Fibre ◽  
Residual Nitrogen ◽  
Nitrogen Free Extract ◽  
Sequence Effects ◽  
Dominant Influence ◽  
Proximate Analyses

Proximate analyses of roots (to plow depth) and stubble in one-, three-, and five-year-old sods, considered in relation to sequence effects as judged by the nitrogen absorption of the first two wheat crops after each age of sod, indicated the nitrogen content of the hay crop residues to be the dominant influence. Alfalfa was much superior to the grasses, a result apparently of the higher quantity of nitrogen returned to the soil and of the narrower C:N ratio in its residues. Timothy led the grasses, contributing the highest quantity of nitrogen in residues with the lowest percentage of crude fibre and the narrowest ratio of crude fibre to nitrogen-free extract. Brome contributed more residual nitrogen than western rye, but was slightly inferior in sequence effects.

Effect of Heat Treatment on TiNx Film Structure

2005 ◽  
Vol 480-481 ◽  
pp. 187-192
Author(s):  
S. Zerkout ◽  
M. Benkahoul ◽  
H. Sahraoui ◽  
S. Achour ◽  
A. Mosser
Keyword(s):  
Heat Treatment ◽  
Nitrogen Content ◽  
Thermal Instability ◽  
Lattice Parameter ◽  
Film Structure ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Tin Films ◽  
Film Instability ◽  
Nitrogen Contents

TiN films with different nitrogen contents were deposited on glass and Si (100) substrates by d. c. magnetron reactive sputtering. The structure of the films was determined by Xray diffraction. It was found that heat treatment at 773 decreased the lattice parameter. A considerable thermal instability of over-stoichiometric films was observed after annealing films in air. This instability enhanced with increasing nitrogen content and is characterized by an abundant appearance of clear and dark disks in Scanning Electron Microscopy (SEM). Also, it was shown that the film instability does not come from an interfacial reaction but was observed when the TiNx layers present a (200) preferred orientation together with high nitrogen content.

A Study of Austempered Ductile Cast Iron

1984 ◽  
Vol 34 ◽  
Author(s):  
J. D. Verhoeven ◽  
A. El Nagar ◽  
B. El Sarnagawa ◽  
D. P. Cornwell ◽  
F. Laabs
Keyword(s):  
Cast Iron ◽  
Retained Austenite ◽  
Lattice Parameter ◽  
Ductile Cast Iron ◽  
Austenitizing Temperature ◽  
Iron Matrix ◽  
Gamma Iron ◽  
Step Process ◽  
Austempered Ductile Cast Iron

ABSTRACTExperiments were carried out on unalloyed ductile cast iron to evaluate the % retained austenite (%RY) and its lattice parameter as a function of austenitizing time and temperature for austempering temperatures ranging from 270 to 420°C. Results are related to expected carbon levels in the gamma iron matrix at the austenitizing temperature. It is shown that the rate of austenitization can be described as a two step process and experiments demonstrate that 900°C austenitizatlon is complete after 8m. An 1100°C homogenizatdon has been shown to have a small effect upon %RY and rate of austenitization.

Nitrogen absorption phenomenon of GTA welding with nitrogen-mixed shielding gases: effect of plasma characteristics on nitrogen content in GTA welded metal

2014 ◽  
Vol 29 (4) ◽  
pp. 262-269 ◽  
Author(s):  
Shinji Kodama ◽  
Kazuki Sugiura ◽  
Shota Nakanishi ◽  
Yoshihiro Tsujimura ◽  
Manabu Tanaka ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Gta Welding ◽  
Shielding Gases ◽  
Nitrogen Absorption ◽  
Absorption Phenomenon ◽  
Plasma Characteristics

Diffraction line broadening due to lattice-parameter variations caused by a spatially varying scalar variable: its orientation dependence caused by locally varying nitrogen content in ∊-FeN0.433

2004 ◽  
Vol 37 (1) ◽  
pp. 123-135 ◽  
Author(s):  
Andreas Leineweber ◽  
Eric J. Mittemeijer
Keyword(s):  
Lattice Parameter ◽  
Orientation Dependence ◽  
Diffraction Line ◽  
Iron Nitride ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Parameter Variations ◽  
Scalar Variable ◽  
Spatially Varying ◽  
Special Case

The diffraction line broadening due to lattice-parameter variations caused by a position-dependent (spatial) scalar variable (e.g.the composition) was analysed theoretically. It was shown that the anisotropy of the resulting microstrain-like line broadening depends on the symmetry of the crystal system of the phase concerned. This model provides a physical basis for a special case of a previously reported phenomenological description of anisotropic microstrain broadening [Stephens (1999).J. Appl. Cryst.32, 281–289], which is widely used in Rietveld refinement. The model presented was used to analyse thehkldependence of the X-ray diffraction line broadening of a sample of hexagonal ∊-iron nitride, FeNy0with the average N contenty0= 0.433. The observed anisotropy of the line broadening was shown to be compatible with the known composition dependencies of the lattice parametersa(y) andc(y). From the extent of the line broadening, the standard deviation ofy0could be determined very well, as 0.008.

Mössbauer study of gamma‴-iron nitride film

ISIAME 2012 ◽  
2012 ◽  
pp. 331-335
Author(s):  
Yasuhiro Yamada ◽  
Ryo Usui ◽  
Yoshio Kobayashi
Keyword(s):  
Iron Nitride ◽  
Nitride Film ◽  
Mössbauer Study ◽  
Gamma Iron ◽  
Iron Nitride Film

Synthesis of Ultrafine Particles of Iron and Iron Nitride by Evaporation of Iron in Gas Mixtures of Argon and Ammonia or Argon and Nitrogen

2007 ◽  
Vol 561-565 ◽  
pp. 1047-1050
Author(s):  
Seiji Yokoyama ◽  
Katsuyoshi Saito
Keyword(s):  
Nitrogen Content ◽  
Magnetic Materials ◽  
Ultrafine Particles ◽  
Gas Mixtures ◽  
Iron Nitride ◽  
Gas Mixture ◽  
Mixed Gas ◽  
Fundamental Study ◽  
Mean Size ◽  
The Mean

As a series of fundamental study on the gas evaporation method, a levitation-melted iron was evaporated in the gas mixtures of argon + ammonia, argon + nitrogen to synthesize ultrafine particles of iron nitride that got attention as one of the magnetic materials. The particles that were obtained in the gas mixture of argon and nitrogen were α-Fe. But nitrogen was chemisorbed on the surface of the particle, because nitrogen content in the particles was larger than the solubility of nitrogen in iron. The particles that formed in the mixed gas of argon and ammonia were Fe4N. The mean size of the particles of iron nitride was approximately 60 nm. The formation ratio of iron nitride was about 86 %.

scholarly journals Study on greenhouse soil nitrogen absorption and soil layer transport of different summer catch crops with different planting density in North China

2020 ◽  
Vol 143 ◽  
pp. 02023
Author(s):  
Pei Zhiqiang ◽  
Lu Shuchang ◽  
Wang Xi ◽  
Hou Kun ◽  
Ya Zongjie ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Soil Nitrogen ◽  
Sweet Sorghum ◽  
Nitrate Nitrogen ◽  
Soil Layer ◽  
Reduction Rate ◽  
Planting Density ◽  
Nitrogen Absorption ◽  
Catch Crops ◽  
Waxy Corn

In order to improve the utilization rate of nitrogen fertilizer and reduce the environmental pollution risk of the nitrogen accumulation in the vegetable field, this study was carried out in the summer leisure period of the greenhouse vegetable production. This experiment designed different planting density treatments in 2017 and 2018, i.e. for catch waxy corn, 3300 plants/667m2 (WCD1), 5000 plants/667m2 (WCD2), 6600 plants/667m2 (WCD3), for forage sweet sorghum, 4500 plants /667m2 (FSS4), 7000 plants/667m2 (FSS5), 9000 plants/667m2 (FSS6) in 2017; and for catch waxy corn, 4500 plants/667m2 (WCDI), 7000 plants/667m2 (WCDII), 9000 plants/667m2(WCDIII), for forage sweet sorghum, 7000 plants/667m2 (FSSIV), 10000 plants/667m2 (FSSV), 14000 plants/667m2 (FSSVI) in 2018. The results showed that the biomass and nitrogen absorption of the two catch crops began to improve and then decreased with the increase of planting density. The nitrogen absorption amount of the catch waxy corn and forage sweet sorghum was 22.36~28.68 kg/667m2,21.67~24.39 kg/667m2, respectively. Different planting density of catch waxy corn and forage sweet sorghum could significantly reduce the total nitrogen content of 0~30cm soil layer and the nitrate nitrogen content of 0~90cm soil layer, for catch waxy corn and forage sweet sorghum, the reduction rate of total nitrogen content in 0~30cm soil layer was 9.6%~27.0%, 5.7%~23.5%, the reduction rate of nitrate nitrogen content reached 50.0%~90.8%, 80.1%~96.4%, respectively, which effectively controlled the nitrate nitrogen leaching to soil deep layer. Planting catch crops could increase soil urease activity, regulate soil nitrogen transformation. Compared with other treatments, WCDII and FSSV treatment can reduce the initial urease activity and soil nitrate nitrogen content of next crops, which is consistent with the nutrient requirements of broccoli in the early stage of growth. These catch crops planting could reduce the nitrogen environmental risk in the greenhouse soil. Finally, the study proposed that the suitable planting density of catch waxy corn and forage sweet sorghum planted was 6600~7000 plants/667m2, and 9000~10000 plants/667m2, respectively, in the greenhouse summer leisure period. It is more advantageous to improve soil nitrogen absorption and reduce soil nitrogen environmental risks for catch waxy corn.

Research on Nitrogen Control Technology of High-Pressure Bottle Steel

2014 ◽  
Vol 988 ◽  
pp. 177-182
Author(s):  
Chen Jun
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Control Measures ◽  
Nitrogen Control ◽  
Nitrogen Absorption ◽  
High Nitrogen ◽  
Finished Steel ◽  
Casting Technology ◽  
Nitrogen Steel ◽  
Low Nitrogen

Nitrogen content of the high-pressure bottle steel was high and with big fluctuation, it is difficult to control. SO, investigation on nitrogen content of the all steelmaking process is carried out. Results of the investigation indicated that nitrogen content of the aimed steel was high, nitrogen absorption was mainly happened during tapping and in the course of after refining to before casting。And then nitrogen control measures such as low-nitrogen steel melting technology, optimization of deoxidization, protective casting technology is raised. After that nitrogen content of the aimed steel was reduced and nitrogen absorption during tapping and in the course of after refining to before casting was effectively controlled, nitrogen content of the finished steel was stably controlled in 50×10-6, the effect of nitrogen on property of steel is reduced.

Sign in / Sign up

Export Citation Format

Share Document