scholarly journals Optimizing The Metalloid Content in Bulk Metallic Glasses

1999 ◽  
Vol 580 ◽  
Author(s):  
O. Jin ◽  
R. B. Schwarz ◽  
F. M. Alamgir ◽  
H. Jain
Keyword(s):  
Metallic Glasses ◽  
Photoelectron Spectroscopy ◽  
Short Range ◽  
Phosphorus Content ◽  
X Ray ◽  
P Concentration ◽  
Straight Line ◽  
P Content ◽  
Critical P Concentration ◽  
Straight Lines

AbstractWe have studied the effect of phosphorus content on the formation and properties of bulk Pd-Cu-P and Pd-Ni-P metallic glasses. It was found that the molar volumes of the Pd-Ni-P bulk glasses plotted as a function of P content follow a straight line whereas those for the Pd-Cu-P glasses follow two straight lines of different slopes, intersecting at a critical P concentration. The transition in molar volume behavior is attributed to a change in the alloy's short-range order with increasing P content. The origin of this structural change is discussed based on x-ray photoelectron spectroscopy (XPS) measurements.

X-ray-photoelectron-spectroscopy study of the electronic structure of Ni-P metallic glasses

1986 ◽  
Vol 34 (10) ◽  
pp. 6874-6879 ◽  
Author(s):  
M. G. Thube ◽  
S. K. Kulkarni ◽  
D. Huerta ◽  
Arun S. Nigavekar
Keyword(s):  
Electronic Structure ◽  
Metallic Glasses ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray

On Many-electron Effects and Multiplet Splittings in X-ray Photoelectron Spectroscopy as a Diagnostic Tool for Metallic Glasses

1988 ◽  
pp. 261-264
Author(s):  
Z.M. STADNIK ◽  
J.F. VAN ACKER ◽  
J.C. FUGGLE ◽  
H.J.W.M. HOEKSTRA ◽  
K.H.J. BUSCHOW ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Diagnostic Tool ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Electron Effects

scholarly journals Investigation of short-range structural order in Zr69.5Cu12Ni11Al7.5and Zr41.5Ti41.5Ni17glasses, using X-ray absorption spectroscopy andab initiomolecular dynamics simulations

2014 ◽  
Vol 21 (6) ◽  
pp. 1296-1304 ◽  
Author(s):  
Debdutta Lahiri ◽  
Surinder M. Sharma ◽  
Ashok K. Verma ◽  
B. Vishwanadh ◽  
G. K. Dey ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Metallic Glasses ◽  
Short Range ◽  
Short Range Order ◽  
Relative Importance ◽  
Chemical Order ◽  
X Ray ◽  
Glass Forming ◽  
Dynamics Simulations ◽  
X Ray Absorption

Short-range order has been investigated in Zr69.5Cu12Ni11Al7.5and Zr41.5Ti41.5Ni17metallic glasses using X-ray absorption spectroscopy andab initiomolecular dynamics simulations. While both of these alloys are good glass formers, there is a difference in their glass-forming abilities (Zr41.5Ti41.5Ni17> Zr69.5Cu12Ni11Al7.5). This difference is explained by inciting the relative importance of strong chemical order, icosahedral content, cluster symmetry and configuration diversity.

Plasma Cleaning and Nitridation of Sapphire Substrates for AlxGa1-xN Epitaxy as Studied by ARXPS and XPD

1997 ◽  
Vol 468 ◽  
Author(s):  
M. Seelmann-Eggebert ◽  
H. Zimmermann ◽  
H. Obloh ◽  
R. Niebuhr ◽  
B. Wachtendorf
Keyword(s):  
High Temperature ◽  
Photoelectron Spectroscopy ◽  
Short Range ◽  
Short Range Order ◽  
Thermal Treatments ◽  
Plasma Cleaning ◽  
Substrate Preparation ◽  
X Ray ◽  
Sapphire Substrates ◽  
Mocvd Reactor

ABSTRACTThe influence of plasma and thermal treatments on the structure and composition of sapphire (00–1) surfaces have been studied by hemispherically recorded x-ray photoelectron spectroscopy in view of substrate preparation for the epitaxy of GaN. Producing well-ordered surfaces, O2 plasma based treatments are found to efficiently remove surface contamination. AlN films with good short-range order are obtained by a simple high temperature nitridation step in the MOCVD reactor.

OBSERVATION OF PHASE TRANSITIONS AT THE (100) SURFACE OF Al-3 at.% Ag

1995 ◽  
Vol 02 (02) ◽  
pp. 141-145 ◽  
Author(s):  
E. WETLI ◽  
M. HOCHSTRASSER ◽  
D. PESCIA ◽  
M. ERBUDAK
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Photoelectron Spectroscopy ◽  
Short Range ◽  
Short Range Order ◽  
Elevated Temperatures ◽  
X Ray ◽  
First Order ◽  
First Order Phase Transition ◽  
First Order Phase

In the bulk binary alloy Al-3 at.% Ag , Ag 2 Al precipitates are formed below 410°C which are reversibly dissolved at elevated temperatures. We have followed this phase transition at a (100) surface as a function of temperature by monitoring the bandwidth of the Ag 4d states in X-ray photoelectron spectroscopy. Since the bandwidth measures the coordination number of the emitting atoms, it directly reveals the short-range order of the Ag atoms at the surface. The measurements show that the dissolution of the Ag -rich clusters starts at temperatures at least 100 K below the bulk transition, and the observed hysteresis behavior is indicative of a first-order phase transition at the surface.

scholarly journals Effect of nanocoating morphology on the signal of X-ray Photoelectron Spectroscopy

2021 ◽  
Vol 2144 (1) ◽  
pp. 012007
Author(s):  
V P Afanas’ev ◽  
L G Lobanova ◽  
D N Selyakov ◽  
M A Semenov-Shefov
Keyword(s):  
Photoelectron Spectroscopy ◽  
Strong Dependence ◽  
Cluster Structure ◽  
Substrate Material ◽  
Homogeneous Layer ◽  
Viewing Angle ◽  
X Ray ◽  
Plane Parallel ◽  
Straight Line ◽  
The Mathematical Model

Abstract The paper considers the application of the traditional X-ray photoelectron spectroscopy (XPS) methodology: the Overlayer Thickness Determination for the analysis of coating parameters. In particular situations considered in this work, it is energetically favorable for the atoms of the coating to form clusters, but not be evenly distributed on the surface of the substrate material. The change in the XPS signal is analyzed in situations when the coating is not a plane-parallel homogeneous layer, but an island (cluster) structure. The mathematical model of the XPS signal formation is considered for the case of the cluster covering in the form of parallelepipeds. Photoelectron path distributions (in the coating material) analysis indicated a strong dependence of the signal on the viewing angle. For the purpose of analysis, experimental spectra were obtained for several samples: gold depositions of various thicknesses on a silicon substrate. The spectra were measured for different viewing angles of photoelectrons and interpreted within the Straight Line Approximation (SLA). It is shown that proposed simplest model of an island coating allows to describe the effect of a decrease in the value of the effective average coating thickness, determined in plane-parallel geometry, with an increase in the viewing angle, observed in XPS experiments with angular resolution.

scholarly journals Ta2N3 nanocrystals grown in Al2O3 thin layers

2017 ◽  
Vol 8 ◽  
pp. 2162-2170 ◽  
Author(s):  
Krešimir Salamon ◽  
Maja Buljan ◽  
Iva Šarić ◽  
Mladen Petravić ◽  
Sigrid Bernstorff
Keyword(s):  
Photoelectron Spectroscopy ◽  
Short Range ◽  
Secondary Ion Mass Spectrometry ◽  
Average Diameter ◽  
Grazing Incidence ◽  
Thin Layers ◽  
Tantalum Nitride ◽  
Morphological Properties ◽  
X Ray ◽  
Spatial Ordering

Tantalum nitride nanoparticles (NPs) and cubic bixbyite-type Ta2N3 nanocrystals (NCs) were grown in (Ta–N+Al2O3)/Al2O3 periodic multilayers (MLs) after thermal treatment. The MLs were prepared by magnetron deposition at room temperature and characterized using grazing incidence small-angle X-ray scattering (GISAXS), X-ray reflectivity (XRR), grazing incidence X-ray diffraction (GIXRD), secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS). We found amorphous tantalum nitride NPs at 600–800 °C, with a high degree of ordering along the surface normal and short-range ordering within the layers containing tantalum (metallic layers). At an even higher annealing temperature of 900 °C the NPs crystallize in the rare and relatively unexplored Ta2N3 phase. However, the environment, morphology and spatial ordering of the NCs depend on the thickness of the metallic layers. For 12 nm thick metallic layers, the Ta2N3 NCs have an average diameter of 6 nm and they are confined and short-range ordered within the metallic layers. When the metallic layers are thinner, the NCs grow over 20 nm in diameter, show no spatial ordering, while the periodic structure of the ML was completely destroyed. The results presented here demonstrate a self-assembly process of tantalum nitride NPs, the morphological properties of which depend on the preparation conditions. This can be used as a generic procedure to realize highly tunable and designable optical properties of thin films containing transition-metal nitride nanocrystals.

Studies of short-range order in amorphous Ge x Se100−x compounds by X-ray photoelectron spectroscopy

1994 ◽  
Vol 69 (2) ◽  
pp. 209-222 ◽  
Author(s):  
Marie-Luce Theye ◽  
Adriana Gheorghiu ◽  
Christiane Senemaud ◽  
Mohamed F. Kotkata ◽  
Kandil M. Kandil
Keyword(s):  
Photoelectron Spectroscopy ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
X Ray
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