scholarly journals Pre-Crystallization Criteria and Triple Crystallization Kinetic Parameters of Amorphous-Crystalline Phase Transition of As40S45Se15 Alloy

2021 ◽  
Author(s):  
Meshal Alzaid ◽  
mohamed N. Abd-el Salam ◽  
Ammar Qasem ◽  
E. R. Shaaban ◽  
N. M.A. Hadia
Keyword(s):  
Crystallization Kinetic ◽  
Glassy Alloy ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
Glass Forming ◽  
Crystallization Region ◽  
Electron Scanning Microscope ◽  
Relationship Of ◽  
The Relationship ◽  
Crystalline Phase Transition

Abstract This framework focuses mainly on a detailed study of the pre-crystallization criteria that characterize the As40S45Se15 glassy alloy in various heating rates ranging from 5 to 40 (K/min.) by DSC thermo-grams in the range of (300-575 K). These criteria aim to clarify the relationship of the tendency of glass-forming by the heating rate for the investigated glassy alloy. As well, the present framework demonstrates the criteria of thermal stability. Continuously, the various nucleation and growth pathways. The transformation in activation energy with the volume of the crystalline portion was deduced and, through this, we were able to determine the surface resistance of the analyzed bulk alloy in the crystallization region. The crystalline structure of the study sample was recognized by X-ray diffraction (XRD) and electron scanning microscope (SEM).

X-ray diffraction studies of vivianite, metavivianite, and barićite

1985 ◽  
Vol 49 (350) ◽  
pp. 81-85 ◽  
Author(s):  
T. Sameshima ◽  
G. S. Henderson ◽  
P. M. Black ◽  
K. A. Rodgers
Keyword(s):  
Monoclinic Phase ◽  
Amorphous State ◽  
Twin Plane ◽  
Coarse Grained ◽  
X Ray Diffraction ◽  
X Ray ◽  
Triclinic Phase ◽  
Type Lattice ◽  
Relationship Of ◽  
The Relationship

AbstractVivianite specimens from various world localities yield X-ray powder patterns of two types: one corresponds with that shown by synthetic Fe3(PO4)2· 8H2O and is not readily distinguished from that of barićite; the second shows reflections of monoclinic vivianite and triclinic metavivianite along with reflections of a bobierrite-type phase. The triclinic phase occurs as two twin-related lattices with twin plane 110 being the structural equivalent of 010 in the monoclinic phase. The relationship of the bobierrite-type lattice to the other two has not been established. The ternary pattern is produced by some coarse-grained vivianites on natural oxidation. Finer grained vivianites oxidise to an X-ray amorphous state without passing through a triclinic intermediate.

Melt Temperature Dependence on Glass Forming Ability of Al-Mg Alloys

2009 ◽  
Vol 79-82 ◽  
pp. 191-194
Author(s):  
Hao Ran Geng ◽  
Yan Bo Deng ◽  
Zhi Ming Wang ◽  
Xue Liang Wang ◽  
Zhen Yuan Li
Keyword(s):  
Melt Spinning ◽  
Liquid Structure ◽  
Glass Forming Ability ◽  
Dsc Analysis ◽  
X Ray Diffraction ◽  
Melt Temperature ◽  
X Ray ◽  
Glass Forming ◽  
The Relationship ◽  
Al Mg Alloys

The relationship between the viscosity of Al84Mg10Ce6 alloy melt and liquid structure was studied by viscosity measurements, X-ray diffraction and DSC analysis in this paper. In addition, the glass forming ability of alloy ties produced by melt spinning was analyzed. Based on the above results, the relationship between alloy melts and its glass forming ability(GFA)was studied. The addition of element Ce leads to the abnormal change of Al84Mg10Ce6 melt’ s structure and enhances its GFA, furthermore, it results in completely amorphous ties with melt spinning at 850°C.Therefore, there is certain relationship between the Al-Mg based alloys melt and its GFA.

Local Texture and Electromigration in Fine Line Microelectronic Aluminum Metallization

1994 ◽  
Vol 343 ◽  
Author(s):  
J. L. Hurd ◽  
K. P. Rodbell ◽  
D. B. Knorr ◽  
N. L. Koligman
Keyword(s):  
Electron Backscatter Diffraction ◽  
Fiber Texture ◽  
X Ray Diffraction ◽  
Aluminum Films ◽  
Pole Figures ◽  
Grain Orientations ◽  
Aluminum Metallization ◽  
Backscatter Diffraction ◽  
Relationship Of ◽  
The Relationship

ABSTRACTAluminum films 1 μm thick were deposited on oxidized silicon by sputtering and partially ionized beam evaporation to vary the crystallographic texture. These films were patterned into lines and subsequently annealed at 400 °C for 1 h. A strong correlation between the electromigration behavior and the blanket film texture (X-ray diffraction (XRD) / pole figures) has been reported previously for these films. In this work, an Electron Backscatter Diffraction (EBSD) a.k.a. Backscatter Kikuchi Diffraction (BKD) technique was employed using a scanning electron microscope (SEM) to interrogate individual grain orientations. BKD pole figures were acquired for lines ≥0.3 μm wide and for blanket (pad) regions. Identical, inverse pole figures were found for blanket films measured using both XRD and BKD (pads). Furthermore, the BKD (111) fiber texture shows a line width dependency, with narrow lines having a slightly improved texture over blanket (pad) regions. Local grain orientations were investigated near and within electromigration testing sites with characteristic void and hillock morphologies. The relationship of neighboring grain orientations to electromigration damage is shown.

Study of the Phase Formation of Sol-Gel YBa2Cu3O7-x Samples in Flowing Oxygen Atmosphere

2007 ◽  
Vol 546-549 ◽  
pp. 2097-2102
Author(s):  
Ting Luo ◽  
Yi Zhang ◽  
Qing Rong Feng
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Oxygen Atmosphere ◽  
Ambient Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Whole Process ◽  
Relationship Of ◽  
The Relationship ◽  
Flowing Oxygen

The relationship of the resistivity versus synthesizing temperature of sol-gel YBa2Cu3O7-x samples, with Tc 91K, was studied while synthesizing in flowing oxygen atmosphere. A set of high temperature -T curves were obtained for the whole process. After four rounds of synthesizing, the resistivity of the sample was =1.00×10-3cm at room temperature. The -T curve of the last round also showed that the orthorhombic to tetragonal phase transformation of the sample occurred around 600oC that is lower than the YBa2Cu3O7-x sample prepared in ambient atmosphere. Other measurements such as X-ray diffraction, SEM measurement, low temperature R-T and M-T measurement were also taken to get more information of these samples.

Thermal conductivity of metallic glassy alloys and its relationship to the glass forming ability and the observed cooling rates

2008 ◽  
Vol 23 (8) ◽  
pp. 2283-2287 ◽  
Author(s):  
Dmitri V. Louzguine-Luzgin ◽  
Takanobu Saito ◽  
Junji Saida ◽  
Akihisa Inoue
Keyword(s):  
Thermal Conductivity ◽  
Glassy Alloy ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
Cooling Rates ◽  
Glass Forming ◽  
Glassy Alloys ◽  
Mold Casting ◽  
Cooling Behavior ◽  
The Relationship

In this work, we study the cooling behavior of several typical bulk glassy alloys on casing and present the relationship between the thermal conductivity of a glassy alloy and the cooling rate upon mold casting. The cooling rates obtained for Ti-, Zr-, Pd-, and Cu-based bulk glass forming alloys are found to scale with the thermal conductivities of the studied glassy alloys.

Clay mineralogy at Rothamsted: 1934—1988

Clay Minerals ◽  
1999 ◽  
Vol 34 (1) ◽  
pp. 165-183 ◽  
Author(s):  
P. J. Loveland ◽  
I. G. Wood ◽  
A. H. Weir
Keyword(s):  
Organic Molecules ◽  
Clay Mineralogy ◽  
Soil Survey ◽  
X Ray Diffraction ◽  
England And Wales ◽  
Soil Clays ◽  
Structure Determinations ◽  
Soil Clay ◽  
Relationship Of ◽  
The Relationship

AbstractSoil clay mineralogy at Rothamsted began in the early 1930s, and quickly focused on technique, swelling minerals, micas and sorption phenomena. By the mid-1940s interest had extended to the formation and spatial distribution of soil clays with the move of the Soil Survey of England and Wales to Rothamsted. These themes continued for the next 40 years. Considerable contributions were made to crystal chemistry and structure determinations, and the relationship of these to the sorption and desorption of water and organic molecules, and the behaviour of soil K. The pattern of soil clay mineralogy was determined for large parts of England and Wales, and absorbed into soil mapping. The work on X-ray diffraction appeared in the Mineralogical Society Monographs on this subject. These, and the Monograph on Clay Chemistry, which reached their final form in the 1980s, are the lasting monuments to soil clay mineralogical research at Rothamsted.

Preparation of PZT Material with Different Zi/Ti Ratio by Sol-Gel Method

2012 ◽  
Vol 238 ◽  
pp. 105-108 ◽  
Author(s):  
Xi Chen
Keyword(s):  
Lead Zirconate Titanate ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Lead Zirconate ◽  
Synthesis Temperature ◽  
X Ray Diffraction ◽  
Pure Perovskite Phase ◽  
Gel Technique ◽  
Relationship Of ◽  
The Relationship

Lead zirconate titanate powders (PZT) with different Zi/Ti values 52/48, 53/47, 54/46 and 55/45 were prepared by sol-gel technique. The sol was prepared by mixing stable solutions of Zr-nitrate, Pb-acetate and Ti (OC4H9)4 precursors. The decomposition of precursors above 773 K, 923 K and 1073 K for Zi/Ti value equls to 52/48; 53/47 and 54/46; 55/45 leads to the formation of pure perovskite phase, respectively. X-ray diffraction analysis was carried out to confirm the phase formation of PZT. The relationship of synthesis temperature and Zi/Ti ratio value is disscused and it is found that higher synthesis temperature is needed to prepare pure PZT with increasing Zi/Ti ratio.

Effect of Ag addition on local structure of Cu–Zr glassy alloy

2009 ◽  
Vol 24 (1) ◽  
pp. 274-278 ◽  
Author(s):  
Dmitri V. Louzguine-Luzgin ◽  
Kostas Georgarakis ◽  
Alain R. Yavari ◽  
Gavin Vaughan ◽  
Guoqiang Xie ◽  
...  
Keyword(s):  
Radial Distribution ◽  
Glassy Alloy ◽  
Structural Features ◽  
Real Space ◽  
Distribution Functions ◽  
Radial Distribution Functions ◽  
X Ray Diffraction ◽  
Glass Forming ◽  
Glassy Alloys ◽  
Zr Alloy

The effect of Ag substituting Cu on the structural features of the Cu55Zr45, Cu45Zr45Ag10, and Cu35Zr45Ag20 glassy alloys was studied using the real-space pair distribution and radial distribution functions. The experimental x-ray diffraction data obtained in a synchrotron beam were used to derive pair and radial distribution functions through Fourier transformation processing. These results suggest that a certain degree of medium-range order in this alloy is maintained up to about 2.5 nm distance. It is suggested that the addition of Ag causes formation of a more homogeneous local atomic structure compared with that of a binary Cu–Zr alloy, which could be considered as a reason for the improved glass-forming ability of this alloy.

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