scholarly journals The structure of alloys of boron-rich corner of Fe–В–C phase diagram

2020 ◽  
Vol 28 (1) ◽  
pp. 39-42
Author(s):  
O. V. Sukhova
Keyword(s):  
Phase Diagram ◽  
Solid Solutions ◽  
Phase Decomposition ◽  
High Concentration ◽  
X Ray ◽  
Low Concentration ◽  
Eutectic Transformation

The structure and microdurometric characteristics of the Fe–В–С alloys in the range of high concentration of boron (>16.0 wt. % B) and low concentration of carbon (≥ 0.1 wt. % С) were investigated in this work. The methods of quantitative metallographic, X-ray, differential thermal, fluorescent spectral and microdurometric analyses were applied. Carbon was established to dissolve completely in phase constituents of the investigated alloys, forming solid solutions based on iron borides FeB, FeB2, FeB~4 or FeB~19. It was suggested the existence of one eutectic transformation between borides FeB2 and FeB~4 as well as two peritectic transformations between borides FeB and FeB2 or FeB~4 and FeB~19 correspondingly in the studied concentration range. The formation of boride FeB~4 was explained by its stabilization in the presence of carbon in the alloys. After annealing in vacuum at 900 °C for 10 hours with following quenching, the structure became  coarser, but no traces of phase decomposition were revealed in the most alloys. Microhardness of the phases observed in the structure of the investigated alloys increased in the following sequence: FeB→FeB2→FeB~4→FeB~19.

Phase diagram of the Nd2Fe14B–Sm2Fe14B pseudo-binary system

2016 ◽  
Vol 49 (1) ◽  
pp. 64-68 ◽  
Author(s):  
Ch. F. Xu ◽  
K. H. Chen ◽  
Z. F. Gu ◽  
L. Y. Cheng ◽  
D. D. Ma ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Diagram ◽  
Binary System ◽  
Solid Solutions ◽  
Structure Parameters ◽  
Rietveld Refinements ◽  
X Ray ◽  
Full Profile ◽  
Cell Volumes ◽  
Scanning Electron

The phase relations in the (1−x)Nd2Fe14B–xSm2Fe14B system over the whole concentration range have been studied by means of X-ray powder diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscopy with energy-dispersive X-ray spectroscopy. Crystal structure parameters for all studied compositions of (Nd1−xSmx)2Fe14B have been determined by full-profile Rietveld refinements. These results revealed that all intermediate alloys of (Nd1−xSmx)2Fe14B are similar to the end member of the investigated system, Nd2Fe14B, with a tetragonal structure (space groupP42/mnm). The formation of continuous solid solutions has been found in this system. The normalized lattice parameters and unit-cell volumes of (Nd1−xSmx)2Fe14B solid solutions decrease linearly with increasing Sm content. The DTA measurements show that the melting temperature of (Nd1−xSmx)2Fe14B increases linearly with increasing Sm content and no metastable phases were detected. Based on the DTA data and XRD results, a tentative phase diagram for the pseudo-binary system Nd2Fe14B–Sm2Fe14B has been constructed.

scholarly journals PHASE DIAGRAM OF THE TlTe–Tl9TmTe6 SYSTEM

2021 ◽  
pp. 18-22
Author(s):  
I.F. Mehdiyeva ◽  
Keyword(s):  
Phase Diagram ◽  
Phase Equilibria ◽  
Solid Solutions ◽  
X Ray Diffraction ◽  
X Ray

Phase equilibria in the TlTe–Tl9TmTe6 system were experimentally studied by methods of differential thermal and powder X-ray diffraction analyses. The system was found to be non-quasibinary due to the incongruent nature of both initial components melting, but it is stable below solidus and is characterized by formation limited solid solutions (2 mol%) based on Tl9TmTe6 are revealed in the system

scholarly journals Effects of toner-handling work on respiratory function, chest X-ray findings, and biomarkers of inflammation, allergy, and oxidative stress: a 10-year prospective Japanese cohort study

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Niina Terunuma ◽  
Kazunori Ikegami ◽  
Hiroko Kitamura ◽  
Hajime Ando ◽  
Shizuka Kurosaki ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Cohort Study ◽  
Adverse Effects ◽  
Respiratory Function ◽  
Exposure Group ◽  
High Concentration ◽  
X Ray ◽  
Low Concentration ◽  
Chest X Ray ◽  
And Oxidative Stress

Abstract Background Exposure to toner, a substance used in photocopiers and printers, has been associated with siderosilicosis and other adverse effects. However, these findings are limited, and there is insufficient evidence on the long-term effects of toner exposure. Using longitudinal analysis, this study aimed to examine the effects of work involving toner exposure on the respiratory system over time. Methods We conducted a prospective cohort study in a Japanese toner and copier manufacturing enterprise between 2003 and 2013. The cohort included a total of 1468 workers, which comprised 887 toner-handling workers and 581 non-toner-handling workers. We subdivided the toner-handling workers into two groups according to the toner exposure concentration, based on the baseline survey in 2003. We compared the chest X-ray results, respiratory function indicators, and serum and urinary biomarkers of inflammation, allergy, and oxidative stress among the three groups: high-concentration toner exposure group, low-concentration toner exposure group, and non-toner-handling group. To consider the effects of individual differences on the longitudinal data, we used a linear mixed model. Results Similar chest X-ray results, the biomarkers, and most of the respiratory function indicators were found in the non-toner-handling and toner-handling groups. There were no significant yearly changes in the percentage of vital capacity (%VC) in the high-concentration toner exposure group, while there was a significant yearly increase in %VC in the low-concentration toner exposure group and non-toner-handling group. The yearly change in each group was as follows: high-concentration toner exposure group, − 0.11% (95% confidence interval [CI], − 0.29 to 0.08; P = 0.250); low-concentration toner exposure group, 0.13% (95% CI, 0.09–0.17; P < 0.001); and non-toner-handling group, 0.15% (95% CI, 0.01–0.20; P < 0.001). Conclusions In our 10-year prospective study, toner-handling work was not associated with the deterioration of respiratory function and an increase in biomarker values for inflammation, allergy, and oxidative stress. This finding suggests that toner-handling work is irrelevant to the onset of respiratory disease and has minimal adverse effects on the respiratory system under a well-managed work environment.

The PZT system (PbTixZr1−xO3, 0≤x≤1.0): High temperature X-ray diffraction studies. Complete x-T phase diagram of real solid solutions (Part 3)

2013 ◽  
Vol 39 (3) ◽  
pp. 2889-2901 ◽  
Author(s):  
I.N. Andryushina ◽  
L.A. Reznichenko ◽  
L.A. Shilkina ◽  
K.P. Andryushin ◽  
S.I. Dudkina
Keyword(s):  
Phase Diagram ◽  
High Temperature ◽  
Solid Solutions ◽  
X Ray Diffraction ◽  
X Ray ◽  
T Phase ◽  
Real Solid

Supersaturation Behavior of Al Solid Solutions and its Effect on Tensile Property in Al-7Si-xMg Alloys during Solution Heat Treatment (x: 0.4 and 0.8 Mass%)

2016 ◽  
Vol 877 ◽  
pp. 73-77
Author(s):  
Seong Ho Ha ◽  
Su Yeon Lee ◽  
Young Ok Yoon ◽  
Shae K. Kim
Keyword(s):  
Heat Treatment ◽  
Phase Diagram ◽  
Tensile Property ◽  
Solid Solutions ◽  
Electron Probe ◽  
Solution Heat Treatment ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
X Ray ◽  
Electron Probe Micro Analyzer

Supersaturation behavior of Al solid solutions and its effect on tensile property in Al-7Si-0.4Mg and Al-7Si-0.8Mg alloys during solution heat treatment were investigated in this study. As a result of Mg solubility measurement for Al solid solitions after solution heat treatment for 6 hrs by electron probe micro analyzer (EPMA)-wavelength-dispersive X-ray spectroscopy (WDS), Al-7Si-0.8Mg alloy had the higher Mg solubility, about 0.55 mass%, corresponding to that of Al-Si-Mg ternary phase diagram. From the tensile test, Al-7Si-0.8Mg alloy showed the improved strength and similar elongation to that of Al-7Si-0.4Mg alloy.

U(As1−xSex)solid solutions. I. Resonant x-ray and neutron scattering study of the magnetic phase diagram

2001 ◽  
Vol 63 (13) ◽  
Author(s):  
M. J. Longfield ◽  
W. G. Stirling ◽  
E. Lidström ◽  
D. Mannix ◽  
G. H. Lander ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Neutron Scattering ◽  
Solid Solutions ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
X Ray ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals RESEARCH CHEMICAL INTERACTIONS IN THE CuTe–As2Te3 SYSTEM

2021 ◽  
pp. 67-71
Author(s):  
I.I. Aliev ◽  
◽  
S.Sh. Ismailova ◽  
M.H. Shakhbazov ◽  
◽  
...  
Keyword(s):  
Phase Diagram ◽  
Phase Analysis ◽  
Solid Solutions ◽  
Chemical Compound ◽  
Eutectic Composition ◽  
State Diagram ◽  
Eutectic Type ◽  
System State ◽  
Chemical Interactions ◽  
X Ray

By the methods of DTA, XRD, MSA, as well as by measuring the microhardness and determining the density of the alloys, the CuTe–As2Te3 system was studied and a phase diagram was constructed. The system state diagram is of the eutectic type and it is characterized by one chemical compound of Cu3As4Te9 composition. Compounds Cu3As4Te9 melts incongruently at 3200C. Solid solutions based on As2Te3 reaches 8 mol %, and based on CuTe solid solutions are practically not installed. Cu3As4Te9 and As2Te3 form an eutectic composition of 45 mol % As2Te3 and temperature 2650C. The results of X-ray phase analysis have shown that the Сu3As4Te9 compounds is crystallized in the tetragonal syngony with lattice parameters: a = 13.86, c = 18.05 Å, Z = 9, ρpyk. = 6.96 g/cm3, ρrent. = 7.06 g/cm3

Phytochemical Screening and Elemental Analysis of Aqueous and Methanolic Extracts of Datura innoxia Seeds and Leaves

2020 ◽  
Vol 1 (2) ◽  
pp. 1-11
Author(s):  
Adam Farah ◽  
Siddig A. N. Tota
Keyword(s):  
Elemental Analysis ◽  
Energy Dispersive ◽  
Datura Innoxia ◽  
Phytochemical Screening ◽  
High Concentration ◽  
X Ray ◽  
Low Concentration ◽  
Methanolic Extracts ◽  
Zn Concentration ◽  
Soxhlet Apparatus

The present study is aimed to screen the phytochemicals analysis and elements content of Datura innoxia seeds and leaves. The aqueous and methanol extracts were carried out by using the maceration method and soxhlet apparatus, respectively. Results of the study of Phytochemical screening revealed the presence of a high concentration of alkaloids, flavonoids, tannins, steroids and triterpines, and low concentration of saponin and coummarins. The elements in the leaves and seeds (K, Ca, S, Si, Cl, Fe, Al, P, Mg, Ti, Mn, Zn, Sr, Cu, V, Br, and Zr) were determined by energy-dispersive X-ray fluorescence (EDXRF) spectroscopy. K content was the highest in seeds (5.469 ± 0.021%), Ca and S the highest in leaves (2.461 ± 0.019 %, 1.254 ± 0.022 %, respectively). The elements Ti, Mn, Sr, V, Br, and Zr were detected in the leaves with range concentration 0.062-0.002 %. The elements Si, Cl, Fe, Al, P, Mg, and Zn concentration in seeds varied from 0.002 to 0.942% and in leaves varied from 0.014 to 0.346%. The concentration of these elements did not exceed the standard of dangerous toxic levels.

scholarly journals Investigation of Bi2O3-rich part of Bi2O3-PbO phase diagram

2017 ◽  
Vol 82 (12) ◽  
pp. 1433-1444
Author(s):  
Aleksandra Dapcevic ◽  
Dejan Poleti ◽  
Ljiljana Karanovic ◽  
Jelena Miladinovic
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
High Temperature ◽  
Phase Diagrams ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Large Field ◽  
X Ray ◽  
Crucial Difference

A new Bi-rich part of Bi2O3?PbO phase diagram was determined using differential thermal analysis and X-ray powder diffraction techniques. Four solid solutions, ?-Bi2O3, ?-Bi2O3, ?-Bi2O3 and ?ss-Bi8Pb5O17, can be distinguished below 37.5 mol % of PbO and one compound, ?2-Bi8Pb5O17. Two of them, ?-Bi2O3 and ?ss-Bi8Pb5O17 are high-temperature phases. The large field of ?-Bi2O3 stability was implemented making the crucial difference comparing to phase diagrams from the Bi2O3?PbO system published so far.

scholarly journals Effects of toner-handling work on respiratory function, chest X-ray findings, and biomarkers of inflammation, allergy, and oxidative stress: A ten-year prospective Japanese cohort study

2020 ◽  
Author(s):  
Niina Terunuma ◽  
Kazunori Ikegami ◽  
Hiroko Kitamura ◽  
Hajime Ando ◽  
Shizuka Kurosaki ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Cohort Study ◽  
Adverse Effects ◽  
Respiratory Function ◽  
Exposure Group ◽  
High Concentration ◽  
X Ray ◽  
Low Concentration ◽  
Chest X Ray ◽  
And Oxidative Stress

Abstract Background: Exposure to toner, a substance used in photocopiers and printers, has been associated with siderosilicosis and other adverse effects. However, these findings are limited, and there is insufficient evidence on the long-term effects of toner exposure. Using longitudinal analysis, this study aimed to examine the effects of work involving toner exposure on the respiratory system over time.Methods: We conducted a prospective cohort study in a Japanese toner and copier manufacturing enterprise between 2003 and 2013. The cohort included a total of 1468 workers, which comprised 887 toner-handling workers and 581 non-toner-handling workers. We subdivided the toner-handling workers into two groups according to the toner exposure concentration, based on the baseline survey in 2003. We compared the chest X-ray results, respiratory function indicators, and serum and urinary biomarkers of inflammation, allergy, and oxidative stress among the three groups: high-concentration toner exposure group, low-concentration toner exposure group, and non-toner-handling group. To consider the effects of individual differences on the longitudinal data, we used a linear mixed model.Results: Similar chest X-ray results, the biomarkers, and most of the respiratory function indicators were found in the non-toner-handling and toner-handling groups. There were no significant yearly changes in the percentage of vital capacity (%VC) in the high-concentration toner exposure group, while there was a significant yearly increase in %VC in the low-concentration toner exposure group and non-toner-handling group. The yearly change in each group was as follows: high-concentration toner exposure group, -0.11% (95% confidence interval [CI], -0.29 to 0.08; P=0.250); low-concentration toner exposure group, 0.13% (95% CI, 0.09-0.17; P<0.001); and non-toner-handling group, 0.15% (95% CI, 0.01-0.20; P<0.001).Conclusions: In our 10-year prospective study, toner-handling work was not associated with the deterioration of respiratory function and an increase in biomarker values for inflammation, allergy, and oxidative stress. This finding suggests that toner-handling work is irrelevant to the onset of respiratory disease and has minimal adverse effects on the respiratory system under a well-managed work environment.

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