High-pressure crystal chemistry of phenakite (Be2SiO4) and bertrandite (Be4Si2O7(OH)2)

Compressibility and equation of state of beryl (Be3Al2Si6O18) by using a diamond anvil cell and in situ synchrotron X-ray diffraction

“…3). This result in this study is very consistent with those collected with X-ray diffraction method in the study of Hazen et al (1986) and Qin et al (2008), whereas it is different with the conclusions made by Prencipe et al (2011) in terms of ab initio calculation method that Prencipe et al (2011) predicted a phase transition of zone-center soft mode from P6/ mcc to P1 will occur at a pressure about 14 GPa. Furthermore, for the room-temperature and high-pressure singlecrystal X-ray diffraction data, we fitted the P-V data to the third-order BM-EoS to derive the elastic parameters of beryl.…”

“…Subsequently, Qin et al (2008) studied the compression behavior of beryl up to 19.2 GPa, using diamond anvil cell in conjunction with in situ synchrotron radiation energy-dispersive X-ray diffraction, and obtained the K 0 value as 226 ± 6 GPa with fixed K ′ 0 at 4. Their calculations are different from both results obtained by Hazen et al (1986) (K 0 = 170 ± 5 GPa) and by Prencipe and Nestola (2005) …”

“…With fixed K ′ 0 at 4, the fitting results yield V 0 = 675.5 ± 0.1 Å 3 and K 0 = 181 ± 1 GPa, respectively. Figure 4 shows the volume compression (V/V 0 ) of beryl as a function of pressure (P) and derived equation of state and compares with the previous study by Hazen et al (1986). Figure 5 shows the volume Eulerian finite strain Angel 2000) of beryl in this study.…”

“…To date, several studies have been carried out on the crystal-chemistry behavior of beryls and devoted to determining the position and orientation of water molecule inside the channels of the structure with a wide variety of extra-framework populations (Wood and Nassau 1968;de Almeida Sampaio Filho et al 1973a, b;Goldman et al 1978;Aines and Rossman 1984;Barton 1986;Brown and Mills 1986;Čemić et al 1986;Hazen et al 1986;Aurisicchio et al 1988;Sheriff et al 1991;Artioli et al 1993;Charoy et al 1996;Kolesov and Geiger 2000;Pankrath and Langer 2002;Andersson 2006;Gatta et al 2006;Adamo et al 2008). However, there are few reports in the literature about the elasticity of beryl at high pressure (Yoon and Newnham 1973;Hazen et al 1986;Prencipe and Nestola 2005;Qin et al 2008), especially for the thermoelasticity of beryl at simultaneously high pressure and high temperature (Prencipe et al 2011).…”

“…However, there are few reports in the literature about the elasticity of beryl at high pressure (Yoon and Newnham 1973;Hazen et al 1986;Prencipe and Nestola 2005;Qin et al 2008), especially for the thermoelasticity of beryl at simultaneously high pressure and high temperature (Prencipe et al 2011). Hazen et al (1986) investigated the compressibility and high-pressure behavior of beryl at high pressure up to 6 GPa using a diamond anvil cell and obtained the value of 170 (5) GPa for bulk modulus K 0 under the assumption of its pressure derivative (K ′ 0 ) to be 4. Similarly, Prencipe and Nestola (2005) also investigated the compressive behavior of beryl at room temperature and high pressure up to 6.3 GPa and gave the bulk modulus K 0 = 179 ± 1 GPa and its pressure derivative K ′ 0 = 3.7 ± 0.3 GPa.…”