scholarly journals Phase diagram determination and thermodynamic modeling of the Cu-Mg-Si system

2016 ◽  
Vol 52 (1) ◽  
pp. 99-112 ◽  
Author(s):  
J. Zhao ◽  
J. Zhou ◽  
S. Liu ◽  
Y. Du ◽  
S. Tang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Thermodynamic Modeling ◽  
Phase Relationship ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
Complex Phase ◽  
X Ray ◽  
Ternary Compounds ◽  
Measured Phase

13 ternary Cu-Mg-Si alloys were prepared by means of the powder metallurgy method. Phase equilibria at 500 and 700 oC of the Cu-Mg-Si system were determined using X-ray diffraction analysis (XRD). The existence of 3 ternary compounds in this system was verified: CuMgSi_Sigma (Cu16Mg6Si7), Tau (Cu3Mg2Si), and Laves ((Cu0.8Si0.2)2(Mg0.88Cu0.12)). A thermodynamic modeling for the Cu-Mg-Si system was then conducted on the basis of the experimental data obtained in this work and those critically reviewed from the literature. The complex phase relationship between Laves phase and other phases has been successfully modeled in this work. Comparisons between the calculated and the measured phase diagrams show that most of the experimental data can be reproduced by the presently obtained thermodynamic parameters.

Zum System Ca/Mo/O: Phasendiagramm, Synthese und Charakterisierung der ternären Verbindungen / On the System Ca/Mo/O: Phase Diagram, Synthesis and Characterization of Ternary Compounds

1997 ◽  
Vol 52 (10) ◽  
pp. 1169-1174 ◽  
Author(s):  
U. Steiner ◽  
W. Reichelt
Keyword(s):  
Phase Diagram ◽  
Rietveld Analysis ◽  
Solid State Reactions ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ternary Compounds ◽  
Powder Samples ◽  
O Phase

The phase diagram of the ternary system Ca/Mo/O has been determined. Powder samples of the ternary compounds CaMoO4, CaMoO3, CaMo5O8, Ca16.5Mo13.5O40 and Ca5.45Mo18O32 were prepared by solid state reactions. Rietveld analysis based on powder X-ray diffraction data shows that the compound CaMo5O8 has monoclinic structure (P21/c) with a = 7.549, b = 9.064, c = 9.974 Å, β = 110.04°. CaMo5O8, Ca16.5Mo13.5O40 and Ca5.45Mo18O32 are semiconductors over the temperature range 75 to 300 K.

SUBSOLIDUS PHASE RELATIONSHIPS AND SUPERCONDUCTIVITY IN Gd2O3-BaO-CuO SYSTEM

1987 ◽  
Vol 01 (02) ◽  
pp. 337-340 ◽  
Author(s):  
Jingkui LIANG ◽  
Xianting Xu ◽  
Guanghui RAO ◽  
Sishen XIE ◽  
Xiuyu SHAO ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Sintering Temperature ◽  
X Ray Diffraction ◽  
Subsolidus Phase ◽  
X Ray ◽  
Ternary Compounds ◽  
Phase Relationships

The 960°C subsolidus phase relationships in the Gd2O3-BaO-CuO system were determined by means of X-ray diffraction as well as superconductive properties measurements. In the measured partial diagram, two ternary compounds occur: GdBa2Cu3O9−y and Gd2BaCuO5 The relationships between composition and superconductivity were also reported in this paper. Since superconductivity in Ba-Y-Cu-O system was reported(1, 2), many authors have measured the phase diagram for this system (3, 4). In a recent communication we reported superconductivity existing in Ba-Gd-Cu-O system(5). Now we present the results of partial subsolidus phase relationships sintered at 960°C in air, which in turn provide a basis for the sample preparetion technology. We also discussed the effect of compositions on the sintering temperature in this paper.

scholarly journals Experimental investigation and thermodynamic modeling of the Zr-Y system

2010 ◽  
Vol 46 (2) ◽  
pp. 181-192 ◽  
Author(s):  
M.J. Bu ◽  
P.S. Wang ◽  
H.H. Xu ◽  
S.H. Liu ◽  
C.S. Sha ◽  
...  
Keyword(s):  
Experimental Data ◽  
Thermodynamic Calculation ◽  
Eutectic Reaction ◽  
Peritectoid Reaction ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Arc Melting ◽  
Different Temperatures ◽  
Measured Phase

Based on the critical review of all the available experimental data in the literature, 8 key alloys were prepared by arc melting to investigate the phase equilibria in the Zr-Y system, These alloys, which were annealed at 5 different temperatures (800?C, 1000?C, 1100?C, 1120?C, 1160?C), were analyzed by means of X-ray diffraction, differential scanning calorimetry, optical microscopy and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The results showed that a peritectoid reaction (?Zr) + (?Y) = (?Zr) occurs at 886?C ? 5?C, and an eutectic reaction L = (?Zr) + (?Y) occurs at 1313?C ? 5?C. Taking into account the experimental data obtained both from this work and the literature, the Zr-Y system was thermodynamically modeled. The previously reported temperature for the peritectic reaction of (?Y) + L = (?Y) at about 1490 ?C is supported by our thermodynamic calculation. Comparison between the calculated and measured phase diagrams shows that the thermodynamic calculation can well account for the experimental data.

scholarly journals Zeolite NaP1 Functionalization for the Sorption of Metal Complexes with Biodegradable N-(1,2-dicarboxyethyl)-D,L-aspartic Acid

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2518
Author(s):  
Dorota Kołodyńska ◽  
Yongming Ju ◽  
Małgorzata Franus ◽  
Wojciech Franus
Keyword(s):  
Experimental Data ◽  
Aspartic Acid ◽  
Ph Value ◽  
Complexing Agents ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Modified Zeolite ◽  
X Ray ◽  
Slow Release Fertilizers ◽  
Pseudo Second Order

The possibility of application of chitosan-modified zeolite as sorbent for Cu(II), Zn(II), Mn(II), and Fe(III) ions and their mixtures in the presence of N-(1,2-dicarboxyethyl)-D,L-aspartic acid, IDHA) under different experimental conditions were investigated. Chitosan-modified zeolite belongs to the group of biodegradable complexing agents used in fertilizer production. NaP1CS as a carrier forms a barrier to the spontaneous release of the fertilizer into soil. The obtained materials were characterized by Fourier transform infrared spectroscopy (FTIR); surface area determination (ASAP); scanning electron microscopy (SEM-EDS); X-ray fluorescence (XRF); X-ray diffraction (XRD); and carbon, hydrogen, and nitrogen (CHN), as well as thermogravimetric (TGA) methods. The concentrations of Cu(II), Zn(II), Mn(II), and Fe(III) complexes with IDHA varied from 5–20 mg/dm3 for Cu(II), 10–40 mg/dm3 for Fe(III), 20–80 mg/dm3 for Mn(II), and 10–40 mg/dm3 for Zn(II), respectively; pH value (3–6), time (1–120 min), and temperature (293–333 K) on the sorption efficiency were tested. The Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin adsorption models were applied to describe experimental data. The pH 5 proved to be appropriate for adsorption. The pseudo-second order and Langmuir models were consistent with the experimental data. The thermodynamic parameters indicate that adsorption is spontaneous and endothermic. The highest desorption percentage was achieved using the HCl solution, therefore, proving that method can be used to design slow-release fertilizers.

Die Kristallstrukturen der isotypen Verbindungen Ba3[MoN4] und Ba3[WN4] / The Crystal Structures of the Isotypic Compounds Ba3[MoN4] and Ba3[WN4]

1991 ◽  
Vol 46 (5) ◽  
pp. 566-572 ◽  
Author(s):  
Axel Gudat ◽  
Peter Höhn ◽  
Rüdiger Kniep ◽  
Albrecht Rabenau
Keyword(s):  
Transition Metals ◽  
Single Crystal ◽  
Crystal Structures ◽  
Structure Type ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ternary Compounds ◽  
The Third

The isotypic ternary compounds Ba3[MoN4] and Ba3[WN4] were prepared by reaction of the transition metals with barium (Ba3N2, resp.) under nitrogen. The crystal structures were determined by single crystal X-ray diffraction: Ba3[MoN4] (Ba3[WN4]): Pbca; Z = 8; a = 1083.9(3) pm (1091.8(3) pm), b = 1030.3(3) pm (1037.5(3) pm), c = 1202.9(3) pm (1209.2(4) pm). The structures contain isolated tetrahedral anions [MN4]6- (M = Mo, W) which are arranged in form of slightly distorted hexagonal layers and which are stacked along [010] with the sequence (···AB···). Two of the three Ba atoms are situated between, the third one is placed within the layers of [MN4]-groups. In this way the structures can be derived from the Na3As structure type.

X-ray-diffraction study of the superliquid region of the phase diagram of a Langmuir monolayer

1992 ◽  
Vol 45 (8) ◽  
pp. 5734-5737 ◽  
Author(s):  
M. C. Shih ◽  
T. M. Bohanon ◽  
J. M. Mikrut ◽  
P. Zschack ◽  
P. Dutta
Keyword(s):  
Phase Diagram ◽  
Diffraction Study ◽  
Langmuir Monolayer ◽  
X Ray Diffraction ◽  
X Ray

A combined ESR/X-ray diffraction study of the Y2O3–BaO–CuO phase diagram

1990 ◽  
Vol 86 (4) ◽  
pp. 675-682 ◽  
Author(s):  
Ruth Jones ◽  
Robert Janes ◽  
Robert Armstrong ◽  
Nicholas C. Pyper ◽  
Peter P. Edwards ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray

Microstructure of Zr-25at. %Al Melt Spun Ribbons.

1994 ◽  
Vol 364 ◽  
Author(s):  
L. Lutterotti ◽  
S. K. Pradhan ◽  
S. Gialanella ◽  
A. R. Yavari
Keyword(s):  
Phase Diagram ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
Major Phase ◽  
X Ray ◽  
Metastable Structures ◽  
Melt Spun ◽  
Crystallographic Structures ◽  
Melt Spun Ribbons

AbstractFollowing a previous study in which we presented some microstructural aspects of meltspun ribbons having a composition close to Zr-25 at.% Al, we discuss now the crystallography of the phases observed in similar samples. We performed X-Ray diffraction analyses of ribbons and refined the observed crystallographic structures. We could identify a number of stable and metastable structures, according to the actual composition of the ribbons. We also estimated the percentage of each one of these phases. We did the same for some ribbons annealed at 750°C for several times. In this way we could follow the kinetics leading from the initial as-spun condition to the final one, featuring the L12 ordered Zr3Al, as the major phase, and other intermetallic phases of the Zr-Al phase diagram.

Sign in / Sign up

Export Citation Format

Share Document