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Compressibility data of synthetic phosphoellenbergerite, compared to the homeotypical silicate. Error bars are from Table 2.
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The ambient-temperature compressibility and room-pressure thermal expansion of two Mg3(PO4)2 polymorphs (farringtonite = Mg3(PO4)2-I, with 5- and 6-fold coordinated Mg, and chopinite = “Mg-sarcopside” = [6]Mg3(PO4)2-II), three Mg2PO4OH polymorphs (althausite, hydroxylwagnerite and ε-Mg2PO4OH, all with [5]Mg and [6]Mg) and phosphoellenbergerite ([6]...
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Context 1
... α 1 . The v 3 and v 4 values were calculated from a fit of V (T ) = V 0 (1 + v 3 (P − P 0 ) + v 4 (P − P 0 ) 2 ) using OriginPro 7.5. T 0 is the standard temperature (293.15 K), V 0 is the standard volume and P 0 = 1 bar. For forsterite, the thermal-expansion parameters v 1 and v 2 were derived from the data presented in Kroll et al. (2012, their Fig. 3) with the exception of the data of Bouhifd et al. (1996) > 1200 K and the low-temperature data of Kroll et al. (2012). The bulk moduli were taken from the mentioned literature. Table 4. Unit-cell parameters of studied Mg-phosphates as a function of temperature. Figure 5. Thermal-expansion data of Mg 2 PO 4 OH polymorphs. Error bars are ...
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Citations
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