IR pyrometry in diamond anvil cell above 400K

Shuker, P.; Melchior, A.; Assor, Yossi; Belker, Daniel; Sterer, Eran

doi:10.1063/1.2953307

Cited by 15 publications

(20 citation statements)

References 12 publications

(10 reference statements)

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“…The melt curve of Zn was measured in a laser-heated diamond-anvil cell (DAC) [44] using the laser-speckle method and the temperature versus laser-power method [35,44].…”

Section: Details Of Experiments and Calculationsmentioning

confidence: 99%

“…3 where the pressure derivative of c/a is shown for the experiment carried out at 300 K. In the inset it can be appreciated the abrupt change of the pressure dependence of c/a. The existence of this kink (slope change) in the pressure dependence of c/a has been attributed to a softening of acoustic modes [35] and can be caused by an isomorphic phase transition [64]. The fact that there is no detectable discontinuity in 10 either the unit-cell volume or the c/a ratio suggest that the proposed phase transformation might be a second-order transition [65,66].…”

Section: B X-ray Diffractionmentioning

confidence: 99%

“…In contrast with RT studies, the continuation of HP-HT 4 studies had to wait until the last decade. Melting studies have been carried out up to 24 GPa [35,36] and very recently resistivity measurements were conducted up to 5 GPa and 900 K [37] and measurements of the structure of liquid Zn were performed up to 1.6 GPa and 800 K [38]. A second shock-wave experiment on Zn has also been reported in 2012 [39].…”

Section: Introductionmentioning

confidence: 99%

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High-pressure/high-temperature phase diagram of zinc

Errandonea

MacLeod

Ruiz‐Fuertes

et al. 2018

J. Phys.: Condens. Matter

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The phase diagram of zinc (Zn) has been explored up to 140 GPa and 6000 K, by combining optical observations, x-ray diffraction, and ab initio calculations. In the pressure range covered by this study, Zn is found to retain a hexagonal close-packed (hcp) crystal symmetry up to the melting temperature. The known decrease of the axial ratio (c/a) of the hcp phase of Zn under compression is observed in x-ray diffraction experiments from 300 K up to the melting temperature. The pressure at which c/a reaches [Formula: see text] (≈10 GPa) is slightly affected by temperature. When this axial ratio is reached, we observed that single crystals of Zn, formed at high temperature, break into multiple poly-crystals. In addition, a noticeable change in the pressure dependence of c/a takes place at the same pressure. Both phenomena could be caused by an isomorphic second-order phase transition induced by pressure in Zn. The reported melt curve extends previous results from 24 to 135 GPa. The pressure dependence obtained for the melting temperature is accurately described up to 135 GPa by using a Simon-Glatzel equation: [Formula: see text], where P is the pressure in GPa. The determined melt curve agrees with previous low-pressure studies and with shock-wave experiments, with a melting temperature of 5060(30) K at 135 GPa. Finally, a thermal equation of state is reported, which at room-temperature agrees with the literature.

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“…The melt curve of Zn was measured in a laser-heated diamond-anvil cell (DAC) [44] using the laser-speckle method and the temperature versus laser-power method [35,44].…”

Section: Details Of Experiments and Calculationsmentioning

confidence: 99%

Section: B X-ray Diffractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-pressure/high-temperature phase diagram of zinc

Errandonea

MacLeod

Ruiz‐Fuertes

et al. 2018

J. Phys.: Condens. Matter

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“…Figure 3 shows the schematic layout of our optical system. We measure in the near IR at several discrete wavelengths [14] in the wavelength range between 1.8-3.1µm, using a series of 5 narrow band filters to determine the wavelength dependence of the irradiance of the sample (optical spectrometers and CCDs can be used for measuring in the visible). Thermal radiation from a platinum foil, embedded inside a homemade To demonstrate the advantage of eliminating the emissivity, we determined the temperature of a Pt foil by two methods and compared the results to the temperature of the sample, measured independently with a thermocouple.…”

Section: Temperature Measurement In the Lhdac: Experimentsmentioning

confidence: 99%

Strategy and enhanced temperature determination in a laser heated diamond anvil cell

Deemyad

Papathanassiou

Silvera

2009

Journal of Applied Physics

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We show that a strategy for increased accuracy in temperature determination by optical pyrometry when the wavelength dependence of the emissivity is unknown is to measure the spectral irradiance at short wavelengths. We then introduce an improved method of determining the temperature in laser heated diamond anvil cells. In general a blackbody source is used to determine the optical transfer function required for determining the blackbody curve. By using the thermal radiation of a heated absorber at ambient pressure and known temperature, uncertainties in the temperature determination caused by the wavelength dependence of the emissivity of the heated absorber can be eliminated. Temperature determination reduces to a one-parameter fit to the blackbody curve rather than the usual two parameters (emissivity and temperature), leading to increased precision and accuracy.

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“…7, and the peak irradiance shifts into the infrared. Since the predicted temperatures for the melt line were below 1000 K we developed an optical pyrometer for use in the IR using narrow band IR filters [65] and a cooled InSb detector, shown in Fig. 8.…”

Section: The Melting Line Of Hydrogenmentioning

confidence: 99%

Pathways to metallic hydrogen

Silvera

Deemyad

2009

Low Temperature Physics

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The traditional pathway that researchers have used in the goal of producing atomic metallic hydrogen is to compress samples with megabar pressures at low temperature. A number of phases have been observed in solid hydrogen and its isotopes, but all are in the insulating phase. The results of experiment and theory for this pathway are reviewed. In recent years a new pathway has become the focus of this challenge of producing metallic hydrogen, namely a path along the melting line. It has been predicted that the hydrogen melt line will have a peak and with increasing pressure the melt line may descend to zero Kelvin so that high pressure metallic hydrogen may be a quantum liquid. Even at lower pressures hydrogen may melt from a molecular solid to an atomic liquid. Earlier attempts to observe the peak in the melting line were thwarted by diffusion of hydrogen into the pressure cell components and other problems. In the second part of this paper we present a detailed description of our recent successful demonstration of a peak in the melting line of hydrogen.

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IR pyrometry in diamond anvil cell above 400K

Cited by 15 publications

References 12 publications

High-pressure/high-temperature phase diagram of zinc

High-pressure/high-temperature phase diagram of zinc

Strategy and enhanced temperature determination in a laser heated diamond anvil cell

Pathways to metallic hydrogen

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