Short-range order in liquid Li–Pb alloys

An ordering potential out of the Thomas-Fermi type interaction between dissimilar species based on the concept of charge transfer and hence concentration dependent, is constructed to study the thermodynamic properties of the Li-Pb alloy in the Bhatia-Young formalism. It is seen to be fairly successful in predicting the experimental behaviour of concentration fluctuation and the excess stability in the system.

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“…In the intermediate concentration region it agrees better with neutron scattering data of [20]. A Fig.…”

Section: Resultssupporting

confidence: 86%

On the Concentration Fluctuation and Ordering Potential of LiPb in the Bhatia‐Young Approach

Bari

Joarder

Bhuiyan

1993

Physica Status Solidi (b)

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“…The limiting range of α 1 is −1 to 1. α min 1 = −1 indicates complete ordering whereas the phase segregation is exhibited by α max 1 = +1. α 1 for simple alloys is expressed [22] in terms of radial concentration-concentration function, ρ cc (r) as…”

Section: Thermodynamic and Microscopic Functions In The Framework Of mentioning

confidence: 99%

Atomic order and interionic pair potentials in Cu–Sn liquid alloys

Prasad

Chatterjee

Jha

2007

Journal of Alloys and Compounds

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“…It is therefore possible in a neutron diffraction experiment to measure S CC (k) directly. 50 used in the first NDIS experiments. 65 Uncertainties on the partial structure factors that result from uncertainties on the total structure factors and weighting factor matrix can be assessed by using the SVD method.…”

mentioning

confidence: 99%

Identifying and characterising the different structural length scales in liquids and glasses: an experimental approach

Salmon

Zeidler

2013

Phys. Chem. Chem. Phys.

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The structure of several network-forming liquids and glasses is considered, where a focus is placed on the detailed information that is made available by using the method of neutron diffraction with isotope substitution (NDIS). In the case of binary network glass-forming materials with the MX 2 stoichiometry (e.g. GeO 2 , GeSe 2 , ZnCl 2 ), two different length scales at distances greater than the nearest-neighbour distance manifest themselves by peaks in the measured diffraction patterns. The network properties are influenced by a competition between the ordering on these ''intermediate'' and ''extended'' length scales, which can be manipulated by changing the chemical identity of the atomic constituents or by varying state parameters such as the temperature and pressure. The extended-range ordering, which describes the decay of the pair-correlation functions at large-r, can be represented by making a pole analysis of the Ornstein-Zernike equations, an approach that can also be used to describe the large-r behaviour of the pair-correlation functions for liquid and amorphous metals where packing constraints are important. The first applications are then described of the NDIS method to measure the detailed structure of aerodynamically-levitated laser-heated droplets of ''fragile'' glass-forming liquid oxides (CaAl 2 O 4 and CaSiO 3 ) at high-temperatures (B2000 K) and the structure of a ''strong'' network-forming glass (GeO 2 ) under pressures ranging from ambient to B8 GPa. The high-temperature experiments show structural changes on multiple length scales when the oxides are vitrified. The high-pressure experiment offers insight into the density-driven mechanisms of network collapse in GeO 2 glass, and parallels are drawn with the high-pressure behaviour of silica glass. Finally, the hydrogen-bonded network of water is considered, where the first application of the method of oxygen NDIS is used to measure the structures of light versus heavy water and a difference of C0.5% is found between the O-D and O-H intra-molecular bond lengths. The experimental data are best matched by using path integral molecular dynamics simulations with a flexible anharmonic water model, and the results support a competing quantum effects model for water in which its structural and dynamical properties are governed by an offset between intra-molecular and inter-molecular quantum contributions.

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Short-range order in liquid Li–Pb alloys

Cited by 196 publications

References 32 publications

On the Concentration Fluctuation and Ordering Potential of LiPb in the Bhatia‐Young Approach

On the Concentration Fluctuation and Ordering Potential of LiPb in the Bhatia‐Young Approach

Atomic order and interionic pair potentials in Cu–Sn liquid alloys

Identifying and characterising the different structural length scales in liquids and glasses: an experimental approach

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