The thermal expansion of the clinopyroxene and garnet polymorphs of Na2MgSi5O12 determined by X-ray powder diffraction

被引：0
作者：
Tripoliti, E. K. [1 ,2 ]
Thomson, A. R. [1 ,2 ]
Dobson, D. P. [1 ]
Schofield, P. F. [2 ]
Wood, I. G. [1 ]
机构：
[1] UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England
[2] Nat Hist Museum, Mineral Sci Grp, London SW7 5BD, England
来源：
PHYSICS AND CHEMISTRY OF MINERALS | 2025年 / 52卷 / 02期
基金：
英国自然环境研究理事会; 英国科学技术设施理事会;
关键词：
Sodium pyroxene (Na(Mg0.5Si0.5)Si2O6); Sodium garnet (Na2MgSi5O12); Thermal expansion; X-ray powder diffraction; EQUATION-OF-STATE; HIGH-PRESSURE; MAJORITIC GARNETS; CRYSTAL-STRUCTURE; PHASE-TRANSITION; C2/C PYROXENES; SODIUM; COMPRESSIBILITY; JADEITE; GPA;
D O I：
10.1007/s00269-025-01315-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The temperature dependence of the unit-cell parameters of synthetic Na(Mg0.5Si0.5)Si2O6 clinopyroxene and Na2MgSi5O12 garnet were measured, at atmospheric pressure, using X-ray powder diffraction, from 40 K up to their decomposition temperatures (673 K and 793 K respectively). At 300 K the cell parameters were found to be: (i) a = 9.4073(3) & Aring;, b = 8.6487(3) & Aring;, c = 5.2685(2) & Aring;, beta = 108.113(2)degrees, V = 407.41(3) & Aring;3 and rho = 3.286 g/cm(3 ), for Na(Mg0.5Si0.5)Si2O6 pyroxene in space-group P2/n with Z = 4 and (ii) a= 11.4155(7) & Aring;, V= 1487.61(5) & Aring;3 and rho = 3.561 g/cm(3 )for Na2MgSi5O12 garnet in space-group Ia3d with Z = 8. The thermal expansion tensors have been calculated and analysis of the lattice parameters in terms of a Gr & uuml;neisenDebye model is used to estimate the Debye temperature and the incompressibility of the two materials at ambient pressure.
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页数：17
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