Aerodynamic laser-heated contactless furnace for neutron scattering experiments at elevated temperatures

Landron, C.; Hennet, Louis; Coutures, Jean-Pierre; Jenkins, Tim; Aletru, C.; Greaves, Neville; Soper, A. K.; Derbyshire, G.E.

doi:10.1063/1.1150531

Cited by 43 publications

(20 citation statements)

References 34 publications

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“…The working principle of aerodynamic levitation is well known and is described in details elsewhere [10]. The basic idea is to circulate levitation gas (usually argon) through a nozzle onto the sample from below in order to counteract gravity and lift it above the nozzle.…”

Section: Levitatormentioning

confidence: 99%

Time‐of‐flight neutron spectroscopy: a new application of aerodynamic sample levitation

Kozaily

Hennet

Fischer

et al. 2011

Phys. Status Solidi C

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A new version of a laser‐heated aerodynamic levitation apparatus that enables the study of high temperature liquids by neutron spectroscopy is presented. This levitator was developed to be used on the IN6 neutron TimeOf‐Flight (TOF) spectrometer at the European High Flux Neutron Source of the Institute Laue Langevin (ILL) in Grenoble, France. This device overcomes earlier restrictions to small sample sizes as routinely used for neutron diffraction studies on levitated liquids at high temperature, and makes other improvements in signal‐to‐noise ratio. A factor of more than three increase in sample volume in combination with the high flux and low background instrument IN6 makes quasielastic neutron scattering (QENS) studies on levitated molten oxides feasible. Here, we present results of a first QENS experiment towards the study of the relaxation dynamics of a molten CaO‐Al2O3 sample. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Levitatormentioning

confidence: 99%

Time‐of‐flight neutron spectroscopy: a new application of aerodynamic sample levitation

Kozaily

Hennet

Fischer

et al. 2011

Phys. Status Solidi C

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“…In order to study the liquid state, we used the aerodynamic levitation technique combined with CO2 laser heating. This technique was pioneered about 15 years ago by Neville Greaves with teams from the University of Aberystwyth (UK) and the CNRS-CEMHTI in Orléans (France) [9,10].…”

Section: Introductionmentioning

confidence: 99%

Neutron diffraction of calcium aluminosilicate glasses and melts

Hennet

Drewitt

Neuville

et al. 2016

Journal of Non-Crystalline Solids

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractThe combination of neutron diffraction with aerodynamic levitation and laser heating, pioneered by Neville Greaves and co-workers about 15 years ago, is an important tool for studying the structure of liquid melts. Since the first work on liquid Al2O3 published in 2001, the technique has been largely improved and experiments are now routinely performed at neutron sources, providing interesting structural information on various materials.In this paper, the structure of glass-forming compounds in the system CaO-Al2O3-SiO2 was measured by applying neutron diffraction with aerodynamic levitation. Results obtained in the liquid state above the melting point and from the glass at room temperatures are presented. Various compositions were studied by increasing the silica content and by changing the ratio CaO/Al2O3. As observed using other methods, the main structural changes relate to modification of the Al-O short range order.

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“…A further advantage of containerless levitation is that supercooled liquids can be studied which is difficult or impossible with more conventional furnaces because the container induces nucleation. In the containerless levitator technique [35,36], a bead of refractory sample material is placed on a watercooled conical nozzle and levitated by a gas jet, the bead can be laser heated to temperatures of up to 3050 K [37]. The absence of heterogeneous nucleate sites means that liquids can be supercooled up to a few hundred degrees below the stable liquidus curve.…”

Section: Introductionmentioning

confidence: 99%

In situ diffraction studies of magnesium silicate liquids

2008

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Primitive MgO-SiO 2 liquids dominate the early history of the Earth and Terrestrial planets. The structures of these liquids and structure-dependent properties, such as viscosity and diffusion, are considered important in the evolution of these planets, however, MgO-SiO 2 liquids are refractory and do not form glasses easily and it is difficult to measure the structure of these liquids. Container-less synthesis techniques have been used to produce glasses that range in composition from 50 to 33% SiO 2 , corresponding to the compositions of two important mantle minerals: enstatite and forsterite. The structure of these glasses has been determined using combined neutron and high-energy diffraction and show changes in the short-range order as a function of composition. These changes include a jump in Mg-O coordination number at the limit to the formation of the silicate network in forsterite composition glass. These results imply a similar change in the structure of the liquid. Accordingly, the structures of forsterite and enstatite liquids have been determined using high-energy X-rays and a specialized sample environment, a containerless levitator. The main qualitative structural differences between MgSiO 3 and Mg 2 SiO 4 glasses are also observed in the melt. Liquid MgSiO 3 is interpreted as forming a relatively 'strong' network of SiO 4 tetrahedra, whereas the Mg 2 SiO 4 liquid is ''fragile'' and dominated MgO n (n = 4, 5, 6) polyhedra and highly mobile oxygen ions. The results differ significantly from previously reported X-ray diffraction data for liquid MgSiO 3 .

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Aerodynamic laser-heated contactless furnace for neutron scattering experiments at elevated temperatures

Cited by 43 publications

References 34 publications

Time‐of‐flight neutron spectroscopy: a new application of aerodynamic sample levitation

Time‐of‐flight neutron spectroscopy: a new application of aerodynamic sample levitation

Neutron diffraction of calcium aluminosilicate glasses and melts

In situ diffraction studies of magnesium silicate liquids

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