Determination of the bulk modulus of hydroxycancrinite, a possible zeolitic precursor in geopolymers, by high-pressure synchrotron X-ray diffraction

2011 ◽  
Vol 33 (10) ◽  
pp. 1014-1019 ◽  
Author(s):  
Jae Eun Oh ◽  
Simon M. Clark ◽  
Paulo J.M. Monteiro
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
X Ray Diffraction ◽  
X Ray

Experimental determination of bulk modulus of 14Å tobermorite using high pressure synchrotron X-ray diffraction

2012 ◽  
Vol 42 (2) ◽  
pp. 397-403 ◽  
Author(s):  
Jae Eun Oh ◽  
Simon M. Clark ◽  
Hans-Rudolf Wenk ◽  
Paulo J.M. Monteiro
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
Experimental Determination ◽  
X Ray Diffraction ◽  
X Ray

A high-pressure study of HfC and nano-crystalline TiC by X-ray diffraction and density functional theory calculations

2020 ◽  
Vol 34 (34) ◽  
pp. 2050393
Author(s):  
Lun Xiong ◽  
Bin Li ◽  
Bi Liang ◽  
Jinxia Zhu ◽  
Hong Yi ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
High Pressure ◽  
Bulk Modulus ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Functional Theory ◽  
X Ray ◽  
Nano Crystalline

The equation of state (EOS) of HfC and nanosized TiC at high pressure has been studied by means of synchrotron radiation X-ray diffraction (XRD) in a diamond anvil cell (DAC) at ambient temperature, and density functional theory (DFT) calculations. XRD analysis showed that the cubic structure of HfC and nanosized TiC maintained to the maximum pressures. The XRD data yield a bulk modulus [Formula: see text] GPa with [Formula: see text] of HfC. In addition, the bulk modulus of nanosized TiC derived from XRD data is [Formula: see text] GPa with [Formula: see text].

Elastic Properties of Calcium Oxide Perovskites

2002 ◽  
Vol 718 ◽  
Author(s):  
Nancy L. Ross ◽  
Ross J. Angel ◽  
Jennifer Kung ◽  
Tracey D. Chaplin
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
Calcium Oxide ◽  
Specific Volume ◽  
Equations Of State ◽  
X Ray Diffraction ◽  
X Ray ◽  
Threefold Increase ◽  
Volume Relationship ◽  
Brownmillerite Structure

AbstractThe equations of state and axial moduli of the CaBO3 perovskites (B=Zr,Sn,Ti,Ge) and CaFeO2.5 with the brownmillerite structure have been determined using high-pressure, singlecrystal X-ray diffraction. The bulk modulus-specific volume relationship for the Ca-perovskites is nonlinear, with CaSnO3 and CaZrO3 displaying anomalous stiffening (higher bulk moduli) than previously reported and predicted [1,2]. The axial moduli of the a- and c-axes decrease steadily by ∼30% from the least-distorted of the Pbnm perovskites, CaGeO3, to the most distorted, CaZrO3, while the b-axis shows little change. The net result is a threefold increase in the anisotropy of the axial moduli of CaSnO3 and CaZrO3 (∼21%) relative to CaGeO3 and CaTiO3 (∼4-8%). The bulk modulus of CaFeO2.5 falls significantly below the trend for the stoichiometric perovskites. The introduction of 1/6 vacancies on the oxygen positions softens the perovskite structure by 25%.

In situ determination of the spinel-post-spinel transition in Fe3O4 at high pressure and temperature by synchrotron X-ray diffraction

2011 ◽  
Vol 96 (5-6) ◽  
pp. 820-827 ◽  
Author(s):  
K. Schollenbruch ◽  
A. B. Woodland ◽  
D. J. Frost ◽  
Y. Wang ◽  
T. Sanehira ◽  
...  
Keyword(s):  
High Pressure ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray

Compressibility of the high-pressure polymorph of AlOOH to 17 GPa

2009 ◽  
Vol 73 (3) ◽  
pp. 479-485 ◽  
Author(s):  
A. Suzuki
Keyword(s):  
High Pressure ◽  
Equation Of State ◽  
Neutron Diffraction ◽  
Bulk Modulus ◽  
Diffraction Study ◽  
Neutron Diffraction Study ◽  
X Ray Diffraction ◽  
Pressure Derivative ◽  
X Ray ◽  
A Value

AbstractThe equation of state of δ-AlOOH was investigated using powder X-ray diffraction up to 17 GPa. Measurement of the volume at 300 K gave a value of the bulk modulus of K0 = 124(2) GPa, whereas its pressure derivative was K’ = 13.5(7). The b axis of the unit cell is more compressible than the a and c axes – in agreement with a neutron diffraction study at high pressure by Sano-Furukawa et al. (2008). Measurements presented here show that δ-AlOOH has a compressibility 200% higher than in the previously reported equation of state by Vanpeteghem et al. (2002).

X-ray diffraction study of HgBa2CuO4+δ at high pressures

1997 ◽  
Vol 12 (2) ◽  
pp. 106-112
Author(s):  
Eduardo J. Gonzalez ◽  
Winnie Wong-Ng ◽  
Gasper J. Piermarini ◽  
Christian Wolters ◽  
Justin Schwartz
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
Pressure Range ◽  
High Pressures ◽  
Anisotropy Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anisotropic Elastic ◽  
High Pressure Study

An in situ high pressure study using energy dispersive X-ray diffraction has been carried out on the polycrystalline high-Tc superconductor, HgBa2CuO4+δ (Hg-1201), to study its phase stability under pressure and also to measure its compressibility and bulk modulus. No evidence of pressure-induced polymorphism was found in the pressure range investigated, i.e., from 0.1 MPa (1 atm) to 5 GPa. The compound exhibited anisotropic elastic properties. The axial compressibility along the c axis was measured to be (3.96±0.35)×10−3GPa−1 and along the a axis (3.42±0.13)×10−3GPa−1, corresponding to an anisotropy ratio of 1.16±0.11. The bulk modulus was determined to be (94.7±4.2) GPa and, assuming a Poisson's ratio of 0.2, Young's modulus was estimated to be (170±8) GPa.

scholarly journals High Pressure Brillouin Spectroscopy and X-ray Diffraction of Cerium Dioxide

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3683
Author(s):  
Mungo Frost ◽  
John D. Lazarz ◽  
Abraham L. Levitan ◽  
Vitali B. Prakapenka ◽  
Peihao Sun ◽  
...  
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
Cerium Dioxide ◽  
Room Temperature ◽  
Nanocrystalline Powders ◽  
X Ray Diffraction ◽  
Brillouin Spectroscopy ◽  
X Ray ◽  
Nanocrystalline Cerium Dioxide ◽  
Acoustic Velocities

Simultaneous high-pressure Brillouin spectroscopy and powder X-ray diffraction of cerium dioxide powders are presented at room temperature to a pressure of 45 GPa. Micro- and nanocrystalline powders are studied and the density, acoustic velocities and elastic moduli determined. In contrast to recent reports of anomalous compressibility and strength in nanocrystalline cerium dioxide, the acoustic velocities are found to be insensitive to grain size and enhanced strength is not observed in nanocrystalline CeO2. Discrepancies in the bulk moduli derived from Brillouin and powder X-ray diffraction studies suggest that the properties of CeO2 are sensitive to the hydrostaticity of its environment. Our Brillouin data give the shear modulus, G0 = 63 (3) GPa, and adiabatic bulk modulus, KS0 = 142 (9) GPa, which is considerably lower than the isothermal bulk modulus, KT0∼ 230 GPa, determined by high-pressure X-ray diffraction experiments.

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