High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4 MgAl2O4

Details High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4 MgAl2O4 High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4 MgAl2O4

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pcm....32..594s&link_type=abstract

Physics and Chemistry of Minerals, Volume 32, Issue 8-9, pp. 594-602

Physics

3

Al-Rich Phase, Hexagonal Phase, In Situ X-Ray Diffraction, High-Temperature Equation Of State, Morb Density

Scientific paper

Thermal equation of state of an Al-rich phase with Na1.13Mg1.51Al4.47Si1.62O12 composition has been derived from in situ X-ray diffraction experiments using synchrotron radiation and a multianvil apparatus at pressures up to 24 GPa and temperatures up to 1,900 K. The Al-rich phase exhibited a hexagonal symmetry throughout the present pressure temperature conditions and the refined unit-cell parameters at ambient condition were: a=8.729(1) Å, c=2.7695(5) Å, V 0=182.77(6) Å3 ( Z=1; formula weight=420.78 g/mol), yielding the zero-pressure density ρ0=3.823(1) g/cm3 . A least-square fitting of the pressure-volume-temperature data based on Anderson’s pressure scale of gold (Anderson et al. in J Appl Phys 65:1534 543, 1989) to high-temperature Birch-Murnaghan equation of state yielded the isothermal bulk modulus K 0=176(2) GPa, its pressure derivative K {0/'}=4.9(3), temperature derivative (∂ K T /∂ T) P =-0.030(3) GPa K-1 and thermal expansivity α( T)=3.36(6)×10-5+7.2(1.9)×10-9 T, while those values of K 0=181.7(4) GPa, (∂ K T /∂ T) P =-0.020(2) GPa K-1 and α( T)=3.28(7)×10-5+3.0(9)×10-9 T were obtained when K {0/'} was assumed to be 4.0. The estimated bulk density of subducting MORB becomes denser with increasing depth as compared with earlier estimates (Ono et al. in Phys Chem Miner 29:527 531 2002; Vanpeteghem et al. in Phys Earth Planet Inter 138:223 230 2003; Guignot and Andrault in Phys Earth Planet Inter 143 44:107 128 2004), although the difference is insignificant (<0.6%) when the proportions of the hexagonal phase in the MORB compositions (˜20%) are taken into account.

Affiliated with

Also associated with

No associations

Rating

High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4 MgAl2O4 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4 MgAl2O4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4 MgAl2O4 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1467811