Thermo-elastic property of Ca(OH)<sub>2</sub>portlandite

Fukui, Hiroshi; Ohtaka, Osamu; Fujisawa, Takuya; Kunisada, T.; Suzuki, Taku; Kikegawa, Takako

doi:10.1080/0895795031000109670

Cited by 15 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The aggregate bulk modulus from the calculations is 26.6 GPa for the Reuss bound and 31.5 GPa for the VRH average. The bulk modulus obtained from static compression at high pressure is 33-38 GPa (Meade and Jeanloz 1990;Pavese et al 1997;Fukui et al 2003b). In general, the individual elastic moduli of portlandite are lower than brucite values and both exhibit strong elastic anisotropy.…”

Section: Stability Of Brucite and Comparison With Portlanditementioning

confidence: 97%

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa by Brillouin scattering

Jiang

Speziale

Duffy

2006

American Mineralogist

View full text Add to dashboard Cite

The second-order elastic constants of brucite were determined by Brillouin scattering to 15 GPa in a diamond anvil cell. The experiments were carried out using a 4:1 methanol-ethanol mixture as pressure medium, and ruby as a pressure standard. Two planes, one perpendicular to the c axis (basal plane) and the other containing the c axis (meridian plane), were measured at room pressure and 10 elevated pressures. Individual elastic stiffnesses, aggregate moduli, and their pressure derivatives were obtained by fi tting the data to Eulerian fi nite strain equations. The inversion yields individual elastic constants of C 11 = 154.0(14) GPa, C 33 = 49.7(7) GPa, C 12 = 42.1(17) GPa, C 13 = 7.8(25) GPa, C 14 = 1.3(10) GPa, C 44 = 21.3(4) GPa, and their pressure derivatives of (∂C 11 /∂P) 0 = 9.0(2), (∂C 33 /∂P) 0 = 14.0(5), (∂C 12 /∂P) 0 = 3.2(2), (∂C 13 /∂P) 0 = 5.0(1), (∂C 14 /∂P) 0 = 0.9(1), (∂C 44 /∂P) 0 = 3.9(1). Aggregate moduli and their pressure derivatives are K S0 = 36.4(9) GPa, G 0 = 31.3(2) GPa, (∂K S /∂P) T0 = 8.9(4), (∂G/∂P) 0 = 4.3(1) for the Reuss bound, and K S0 = 43.8(8) GPa, G 0 = 35.2(3) GPa, (∂K S /∂P) T0 = 6.8(2), (∂G/P) 0 = 3.4(1) for the Voigt-Reuss-Hill average. The ratio of the linear compressibility along the c and a axes decreased from 4.7 to 1.3 over the examined pressure range. The shear anisotropy (C 66 / C 44 ) decreased from 2.6(1) at ambient condition to 1.3(1) with increase of pressure to 12 GPa. Axial compressibilities and a compression curve constructed from our Brillouin data are in good agreement with previous X-ray diffraction data. The increased interlayer interactions and hydrogen repulsion that occurs as brucite is compressed produce a continuous variation of elastic properties rather than any abrupt discontinuities.

show abstract

Section: Stability Of Brucite and Comparison With Portlanditementioning

confidence: 97%

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa by Brillouin scattering

Jiang

Speziale

Duffy

2006

American Mineralogist

View full text Add to dashboard Cite

show abstract

“…Considering the uptake of H 2 O and CO 2 , the volume expansion is significant (i.e., the 54.49 Å 3 volume fraction per Ca atom in Ca(OH) 2 and 61.51 Å 3 /Ca in CaCO 3 compared to 27.95 Å 3 /Ca in CaO) thus manifesting volume work by a factor of 1.9 for Ca(OH) 2 and 2.2 for CaCO 3 relative to that of CaO. Although the extent of volume compression is small within the experimental p range, relative compressibilities (bulk moduli B 0 are 110 GPa for CaO, [ 67 ] 33 GPa for Ca(OH) 2 , [ 68 ] and 73.5 GPa for CaCO 3 [ 69 ] ) are indicative for the mechanical stabilization at elevated p .…”

Section: Resultsmentioning

confidence: 97%

Pressure Dependence of the Low Temperature Carbonation Kinetics of Calcium Oxide for Potential Thermochemical Energy Storage Purposes and Sustainable CO₂ Fixation

Gravogl

Birkelbach

Müller

et al. 2021

Advanced Sustainable Systems

View full text Add to dashboard Cite

The pressure effect on the carbonation behavior of CaO as model compound is studied under mild hydrothermal conditions, as relevant to sustainable geological CO2 sequestration and for potential utilization in thermochemical energy storage. Reaction yields are determined experimentally by means of in situ powder X‐ray diffraction using CaO powder samples in a controlled reaction with CO2 under gas pressures between 1.0 and 5.0 MPa and at temperatures between 298 and 373 K. The results show a two‐step conversion of CaO to CaCO3, involving Ca(OH)2 as a reactive intermediate, with differing influences of the microstructures on the individual reaction sub‐steps. A kinetic evaluation of the experimental data delivers a high rate‐enhancing effect of temperature on the hydration reaction, whereas the CaCO3 formation is strongly dependent on the available CO2 gas pressure. With this systematic investigation the optimal pressure and temperature conditions for this reaction system can be determined delivering a contribution to a sustainable climate and energy management.

show abstract

“…The P T conditions were chosen based on the onset of retrograde serpentinization in the Tianshan (Li et al, 2007(Li et al, , 2010. Thermodynamic parameters of phases belonging to the system are provided in Supplemen tary Table S1, most of which are available from literatures (Robie and Hemingway, 1995;Holland and Powell, 1998;Fukui et al, 2003) while the thermal expansion coefficient of portlandite was calculated based on the cell volume changes during heating from Xu et al (2007). Redox buffers of magnetite hematite (MH), fayalite magnetite quartz (FMQ), and iron magnetite (IM) were calculated for refer ence at 8 kbar and 420 °C.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

Abiotic methane generation through reduction of serpentinite-hosted dolomite: Implications for carbon mobility in subduction zones

Peng

Zhang

Tumiati

et al. 2021

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Thermo-elastic property of Ca(OH)₂portlandite

Cited by 15 publications

References 0 publications

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa by Brillouin scattering

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa by Brillouin scattering

Pressure Dependence of the Low Temperature Carbonation Kinetics of Calcium Oxide for Potential Thermochemical Energy Storage Purposes and Sustainable CO₂ Fixation

Abiotic methane generation through reduction of serpentinite-hosted dolomite: Implications for carbon mobility in subduction zones

Contact Info

Product

Resources

About

Thermo-elastic property of Ca(OH)2portlandite

Cited by 15 publications

References 0 publications

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa by Brillouin scattering

Single-crystal elasticity of brucite, Mg(OH)2, to 15 GPa by Brillouin scattering

Pressure Dependence of the Low Temperature Carbonation Kinetics of Calcium Oxide for Potential Thermochemical Energy Storage Purposes and Sustainable CO2 Fixation

Abiotic methane generation through reduction of serpentinite-hosted dolomite: Implications for carbon mobility in subduction zones

Contact Info

Product

Resources

About

Thermo-elastic property of Ca(OH)₂portlandite

Pressure Dependence of the Low Temperature Carbonation Kinetics of Calcium Oxide for Potential Thermochemical Energy Storage Purposes and Sustainable CO₂ Fixation