Research Article| January 01, 2000 Equations of State R. J. Angel Bayerisches Geoinstitut, Universität Bayreuth, D95440 Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 © Reviews in Mineralogy Geochemistry (2000) 41 (1): 35–59. https://doi.org/10.2138/rmg.2000.41.2 history Cite View This Citation Add to Manager Share Icon Facebook Twitter LinkedIn MailTo Tools Get Permissions...

Four phases are observed in superconducting Bi-Ca-Sr-Cu-O samples. The phase, with onset temperature near 120 K, is a 15.4-A\r{}-layered compound composition ${\mathrm{Bi}}_{2}$${\mathrm{Ca}}_{1}$${\mathrm{Sr}}_{2}$${\mathrm{O}}_{9}$ and an A-centered orthorhombic unit subcell 5.41\ifmmode\times\else\texttimes\fi{}5.44\ifmmode\times\else\texttimes\fi{}30.78 A${\r{}}^{3}$. X-ray diffraction electron microscopy data consistent structure of alternating perovskite...

Abstract The relationship between linear elasticity theory of solids and their equations state (EoS) is reviewed, along with the commonly-used types isothermal EoS, thermal expansion models, P-V-T EoS. A new console program, EosFit7c, presented. It performs EoS calculations fitting for both volume data, isobaric data P-T data. Linear handled by cubing quantities treating them as volumes in all formulations. Least-squares to incorporates option weight fit measurement uncertainties P, V T...

The behavior of a number commonly used pressure media, including nitrogen, argon, 2-propanol, 4:1 methanol–ethanol mixture, glycerol and various grades silicone oil, has been examined by measuring the X-ray diffraction maxima from quartz single crystals loaded in diamond-anvil cell with each these media turn. In all cases, onset non-hydrostatic stresses within medium is detectable as broadening rocking curves peaks crystals. detected at ∼9.8 GPa mixture methanol ethanol ∼4.2 essentially same...

Two superconducting phases, ${\mathrm{Tl}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{10+\mathrm{\ensuremath{\delta}}}$ (2223) and ${\mathrm{Tl}}_{2}$${\mathrm{Ca}}_{1}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{2}$${)}_{8+\mathrm{\ensuremath{\delta}}}$ (2122), both with onset ${\mathrm{T}}_{\mathrm{c}}$ near 120 K zero resistivity at 100 K, have been isolated from samples in the Tl-Ca-Ba-Cu-O system. The new 2223 superconductor has a...

EosFit7-GUI is a full graphical user interface designed to simplify the analysis of thermal expansion and equations state (EoSs). The software allows users easily perform least-squares fitting EoS parameters diffraction data collected as function varying pressure, temperature or both. It has been especially allow rapid evaluation both parametric fitted data, making it useful for teaching.

The unit-cell parameters of quartz, SiO 2 , have been determined by single-crystal diffraction at 22 pressures to a maximum pressure 8.9 GPa (at room temperature) with an average precision 1 part in 9000. Pressure was the measurement volume CaF fluorite included diamond-anvil cell. variation quartz is described by: −4.91300 (11) = −0.0468 (2) P + 0.00256 (7) − 0.000094 (6) 3 c 5.40482 (17) 0.03851 0.00305 0.000121 where and cell are ångstroms. volume–pressure data Birch–Murnaghan third-order...

Single-crystal x-ray techniques were used to determine two structures that comprise the Y-Ba-Cu-O superconductor. A green phase has orthorhombic ${\mathrm{Y}}_{2}$${\mathrm{BaCuO}}_{5}$ structure. An opaque (${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6+\mathrm{x}}$, 0\ensuremath{\le}x\ensuremath{\le}1.0) is tetragonal (a=3.859 A\r{}, c=11.71 A\r{}; space group P4\ifmmode\bar\else\textasciimacron\fi{}m2;Z=1). The structure related a 1:1:3 AB${\mathrm{O}}_{3}$ perovskite: Ba and Y...

When malaria parasites infect host red blood cells (RBC) and proteolyze hemoglobin, a unique, albeit poorly understood parasite-specific mechanism, detoxifies released heme into hemozoin (Hz). Here, we report the identification characterization of novel Plasmodium Heme Detoxification Protein (HDP) that is extremely potent in converting Hz. HDP functionally conserved across genus its gene locus could not be disrupted. Once expressed, parasite utilizes circuitous “Outbound–Inbound” trafficking...

The pressure-dependent structural evolution of a neutral zinc-imidazolate framework [Zn2(C3H3N2)4]n (ZnIm) has been investigated. as-synthesized three-dimensional ZnIm network (α-phase) crystallizes in the tetragonal space group I41cd (a = 23.5028(4) Å, c 12.4607(3) Å). crystal undergoes phase transition to previously unknown β-phase within 0.543(5)−0.847(5) GPa pressure range. system is conserved during this transformation, and I41 22.7482(3) 13.0168(3) physical mechanism by which occurs...

Minerals trapped as inclusions within other host minerals can develop residual stresses on exhumation a result of the differences between thermo-elastic properties and inclusion phases. The determination possible entrapment pressures temperatures from this stress requires mutual elastic relaxation to be determined. Previous estimates have relied assumption linear elasticity theory. We present new formulation problem that avoids assumption. show for soft such quartz in relatively stiff...

SINGLE , a program that runs under Windows operating systems, can be used to control variety of four-circle Eulerian-cradle single-crystal diffractometers including Huber instruments equipped with motor controllers, the Stoe Stadi-4 and Siemens P4. The software configured, via variables set by user, operate any these environmental devices furnaces diamond-anvil pressure cells. It is specifically designed determine unit-cell parameters precision 1 part in 30 000.

Elastic geothermobarometry is a method of determining metamorphic conditions from the excess pressures exhibited by mineral inclusions trapped inside host minerals. An exact solution to problem combining non-linear Equations State (EoS) with elastic relaxation for elastically isotropic spherical host-inclusion systems without any approximations linear elasticity presented. The encoded into Windows GUI program EosFit-Pinc. performs calculations in full P-V-T EoS both phases, wide variety...

Abstract The concept of the phonon-mode Grüneisen tensor is reviewed as method to determine elastic strains across crystals from changes in wavenumbers Raman-active phonon modes relative an unstrained crystal. symmetry constraints on are discussed and consequences for which combinations can be determined by this stated. A computer program Windows, stRAinMAN, has been written calculate Raman (or other phonon) mode wavenumbers, vice-versa. It downloaded free www.rossangel.net.

Abstract Elastic properties are reported for eight plagioclase feldspars that span compositions from albite (NaSi 3 AlO 8 ) to anorthite (CaSi 2 Al O ). Surface acoustic wave velocities measured using Impulsive Stimulated Light Scattering and compliance sums high‐pressure X‐ray compression studies accurately determine all 21 components of the elasticity tensor these triclinic minerals. The overall pattern changes in individual elastic with composition can be rationalized on basis evolution...

Abstract Elastic geothermobarometry on inclusions is a method to determine pressure-temperature conditions of mineral growth independent chemical equilibrium. Because the difference in their elastic properties, an inclusion completely entrapped inside host will develop residual stress upon exhumation, from which one can back-calculate entrapment pressure. Current geobarometric models assume that both and are elastically isotropic have ideal geometry (the spherical isolated at center infinite...

Abstract Minerals trapped as inclusions within other host minerals will develop non‐lithostatic pressures during both prograde and retrograde metamorphism because of the differences between thermoelastic properties inclusion phases. There is only a single possible path in P–T space, entrapment isomeke, along which no residual pressure would be developed host–inclusion system; are result external temperature deviating from isomeke that passes through conditions. With modern equation state...

Elastic geobarometry for host-inclusion systems can provide new constraints to assess the pressure and temperature conditions attained during metamorphism. Current experimental approaches theory are developed only crystals immersed in a hydrostatic stress field, whereas inclusions experience deviatoric stress. We have method determine strains quartz from Raman spectroscopy using concept of phonon-mode Grüneisen tensor. used ab initio Hartree-Fock/Density Functional Theory calculate...

Knowledge of the elastic properties and crystal chemistry dense oxide structures plays an important role in interpreting composition mineralogy planetary interiors. We report effects (Mg,Fe) 2+ substitution nonstoichiometry due to Fe 3+ on structure, constants ( c ij ) moduli K 0T , 0S G 0 (Mg,Fe)O utilizing single‐crystal X‐ray diffraction gigahertz ultrasonic interferometry with a new method generating high‐frequency shear waves. The acoustic technique features P ‐to‐ S conversion by...

Recent experiments on several oxide perovskites reveal that they undergo tilt phase transitions to higher-symmetry phases increasing pressure and dTc/dP<0, contrary a general rule previously proposed for such zone-boundary transitions. We show the negative slope of boundary is consequence octahedra in these being more compressible than extra-framework cation sites. Conversely, when are stiffer sites, transition temperatures increase with pressure, dTc/dP>0.

The equations of state end‐member MgSiO 3 low‐clinoenstatite and orthoenstatite have been measured by single‐crystal X ray diffraction to pressures in excess 8.5 GPa. volume variation with pressure (space group P2 1 /c) is described a third‐order Birch‐Murnaghan equation the parameters V 0 = 31.292(8) cm mol −1 , K T0 111.1(3.3) GPa, ′ 6.6(1.1). At 7 GPa inverts high‐clinoenstatite phase C2/c), reduction 0.798(14) . This transformation reversible but significant hysteresis at room...

High-pressure single-crystal structure refinement requires intensity data that have been corrected for the various absorption effects in pressure cell. In this contribution, methods calculating corrections a transmission-geometry diamond-anvil cell are reviewed. The ideas presented paper implemented software package Microsoft Windows, Absorb6.0 , available at http://www.crystal.vt.edu/.