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  • 1
    Digitale Medien
    Digitale Medien
    Deviatoric stress measurement under uniaxial compression by a powder x-ray diffraction method (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4327-4331 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The complete stress field in a polycrystalline sample compressed in a modified Drickamer-type apparatus was determined from x-ray diffraction data. The incident x rays, from a synchrotron source, were perpendicular to the compression axis, and the diffracted energy-dispersive signals were simultaneously determined for two directions relative to the compression axis. The two sets of d values measured by this system were analyzed by making use of a new equation derived by Singh, and the uniaxial stress component σ1−σ3 and the parameter α, which describes the stress and strain conditions across the grain boundaries of the sample, were obtained. This method was applied to NaCl and the results give the important information on the stress state and the pressure determination method under direct compression of a solid sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.355975
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  • 2
    Digitale Medien
    Digitale Medien
    Pressure dependence of Sm:YAG fluorescence to 50 GPa: A new calibration as a high pressure scale (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1463-1466 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The pressure-induced wavelength shift of laser excited fluorescence from samarium doped yttrium aluminum garnet (Sm:YAG) was measured up to 50 GPa at room temperature against the R1 shift of ruby. The intense peaks between 618 and 611 nm were analyzed as triplet, Y1, Y2, and Y3, by curve fitting analysis using the Lorentzian function. The Y1 (λ0=618 nm) peak was the strongest peak up to 40 GPa, while the Y2 (λ0=616 nm) peak became the strongest above it. Based upon the pressure dependency of the Y1 and Y2 peaks, the following pressure scales are proposed: P=3.25×Δλ(Y1)–0.015×Δλ2(Y1); P=4.03×Δλ(Y2)–0.055×Δλ2(Y2). As the temperature dependence of the fluorescence shift of Sm:YAG is negligibly small, these pressure scales will be useful for high pressure and high temperature experiments using a diamond anvil cell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356380
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  • 3
    Digitale Medien
    Digitale Medien
    Lattice strains in crystals under uniaxial stress field (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 739-746 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An expression for the lattice strains in a polycrystalline specimen under uniaxial stress field has been extended for all crystal systems. Apparent Miller indices (HKL) are introduced from Miller indices (hkl) and lattice parameters. The lattice strain ε(l1l2l3) of the direction l1l2l3, normal to the plane HKL, can be uniquely expressed for all crystal systems as follows: ε(l1l2l3)={αβ(l1l2l3)+(1−α)[1/(3KV)]}σ p+α(−(t/3)(1−3 cos2 ψ){(1/2)[3/E(l1l2l3) −β(l1l2l3)]})+(1−α){−(t/3)(1−3 cos 2 ψ)[1/(2GV) ]}, where β(l1l2l3) and E(l1l2l3) denote the linear compressibility and the Young modulus, respectively. Bulk modulus KV and shear modulus GV are values for isostrain model. Variable ψ is the angle between loading axis and the normal of the plane HKL. The first term is the strain caused by the hydrostatic stress component σp. The second and third term, strains caused by the differential stress t, correspond to the isostress and the isostrain model, respectively. The parameter α takes a value between 0 (isostrain) and 1 (isostress). A method to determine the hydrostatic stress component σp, differential stress t, and the parameter α from powder x-ray-diffraction is discussed. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362920
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  • 4
    Digitale Medien
    Digitale Medien
    Laser heated diamond anvil apparatus at the Photon Factory and SPring-8: Problems and improvements : Laser heated diamond cell techniques workshop (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1293-1297 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Two high pressure high temperature in situ x-ray diffraction systems constructed at the Photon Factory and at SPring-8 are described. Both systems consist of a laser heated diamond anvil cell, CO2 or YAG laser heating systems, and an angle dispersive powder x-ray diffraction system with an imaging plate detector. CO2 laser heating has an advantage in that the sample can be heated stably and uniformly due to stable absorption of the sample. Use of type-IIa diamond, however, caused plastic deformation of the anvils. YAG laser heating, compared to CO2 laser heating, can be used to much higher pressures and temperatures, although a good control system is required for stable heating. Various problems encountered during construction are discussed. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1343868
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  • 5
    Digitale Medien
    Digitale Medien
    An apparatus to load gaseous materials to the diamond-anvil cell (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2981-2984 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An apparatus to load gases to the sample chamber of the diamond-anvil cell has been devised. The apparatus is driven by a conventional 50 ton hydraulic press and no gas compressor is required. The gas from a commercial gas bomb is compressed to 150 MPa and loaded into the diamond-anvil cell sample chamber. After loading, the pressure of the diamond-anvil cell is increased further using the lever and spring mechanism. This kind of gas loading apparatus will become indispensable not only for studying gaseous materials themselves, but also for making precision measurements at high pressures and high temperatures under hydrostatic conditions. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1147084
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  • 6
    Digitale Medien
    Digitale Medien
    Phase transitions of MnO to 137 GPa (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4153-4159 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An in situ x-ray study up to 137 GPa using a diamond anvil cell combined with synchrotron x-ray radiation has revealed three new phase transitions in MnO. The rhombohedral distortion from a B1 structure starts at about 30 GPa. The volume compression curve of the distorted phase is in good agreement with recent shock compression experiments, suggesting the possibility of a paramagnetic–antiferromagnetic transition associated with the increase of the Néel temperature (TN). A drastic change in the x-ray pattern was observed at about 90 and 120 GPa. The transition pressure of 90 GPa is also consistent with shock compression data. The phases above 90 GPa were expected to be metallic based on the highly reflective nature of the sample. The crystal structure of the high pressure phase above 120 GPa was successfully explained by a B8 (NiAs) structure as expected based on recent first principles calculations. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.373045
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  • 7
    Digitale Medien
    Digitale Medien
    A cylindrical furnace with homogeneous temperature distribution for use in a cubic high-pressure press (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 830-833 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A cylindrical furnace with a homogeneous temperature distribution was designed for use in a cubic press by using the difference method. This method consists of three tubes and is applicable to the very small sample chamber of high-pressure apparatus. The temperature distribution in the furnace thus designed was measured at high pressure and temperature using two methods: (1) by measuring the thermal expansion of NaCl contained in the sample chamber; and (2) by observing the area of molten Pb which was mixed with the NaCl. Both of these measurements were performed by high-pressure and temperature in situ x-ray techniques. It was confirmed from these experiments that the furnace has a homogeneous temperature distribution and the difference in temperature is less than 5 °C when the center is about 600 °C. The homogeneity in temperature is nearly constant, even when the thermal conductivity of the sample is decreased by two orders of magnitude.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141502
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  • 8
    Digitale Medien
    Digitale Medien
    Excited-state properties of a diplatinum(II) complex under high pressure (1989)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 111 (1989), S. 7466-7469 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00201a029
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  • 9
    Digitale Medien
    Digitale Medien
    Phase diagram of oxygen up to 13 GPa and 500 K (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 2272-2273 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100236a004
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  • 10
    Digitale Medien
    Digitale Medien
    Structure and crystal chemistry of perovskite-type MgSiO3 (1978)
    Springer
    Physics and chemistry of minerals 3 (1978), S. 97-110 
    Details
    ISSN: 1432-2021
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Abstract Synthetic clinoenstatite (MgSiO3) has been converted to a single phase with the perovskite structure in complete reactions at approx. 300 kbar in experiments that utilize the laser-heated diamond-anvil pressure apparatus. The structure of this phase after quenching was determined by powder X-ray diffraction intensity measurement to be similar to that of the distorted rare-earth, orthoferrite-type, orthorhombic perovskites, but it is suggested that such distortion from ideal cubic perovskite would diminish at high pressure. The unit cell dimensions and density of perovskite-type MgSiO3 at ambient conditions (1 bar, 25°C) are a=4.780(1) Å, b=4.933(1) Å, c=6.902(1) Å, V=162.75 Å3, and ρ=4.098(1) g/cm3. This phase is 3.1% denser than the isochemical oxide mixture [periclase (MgO)+stishovite (SiO2)]. The small crystal-field stabilization energy of the cation site in the perovskite structure may play an important role in limiting the high-pressure stability field of perovskites that contain transition metal cations. Approximate calculations of the crystal-field effects indicate that perovskite of pure FeSiO3 composition may become stable at 400–600 kbar; pressures greater than 800 kbar would be required to stabilize CoSiO3 or NiSiO3 perovskite.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00308114
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