Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core

Takanori Sakairi; Eiji Ohtani; Seiji Kamada; Takeshi Sakai; Tatsuya Sakamaki; Naohisa Hirao

doi:10.1186/s40645-017-0125-x

Progress in Earth and Planetary Science

Table 1 Experimental conditions and results

From: Melting relations in the Fe–S–Si system at high pressure and temperature: implications for the planetary core

Run number	P ^a	T	Observed phases
Run number	[GPa]	[K]	Observed phases
Fe-8wt.%S-4wt.%Si
FESSI09_004	58(4)	1450(50)	hcp^b, fcc^b, Fe₃S, NaCl(B2)
FESSI09_007	59(4)	1490(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI09_008	59(5)	1580(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI09_009	61(4)	1700(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI09_010	60(4)	1810(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI09_011	60(4)	1830(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI09_012	60(4)	1870(50)	fcc, NaCl(B2)^d
FESSI09_013	58.1(0.3)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_015	55(2)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_016	57(4)	1520(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_017	57(5)	1560(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_018	58(5)	1650(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_019	58(5)	1675(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_020	58(5)	1740(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_022	57(5)	1780(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_023	56(4)	1800(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_024	54(4)	1810(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI10_025	54(4)	1840(50)	hcp, NaCl(B2)^e
FESSI10_026	54(4)	1880(50)	hcp, NaCl(B2)^e
FESSI10_030	49.2(0.6)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI27_012	20.9(0.3)	300	hcp, fcc, Fe₃S, NaCl(B1)
FESSI27_013	21(2)	1275(50)	hcp, fcc, Fe₃S, NaCl(B1)
FESSI27_014	21(2)	1310(50)	hcp, fcc, Fe₃S, NaCl(B1)
FESSI27_015	21(2)	1460(50)	hcp, fcc, Fe₃S, NaCl(B1)
FESSI27_020	21(2)	1520(50)	hcp, fcc, NaCl(B1)
FESSI27_021	21.1(0.3)	300	hcp, fcc, Fe₃S, NaCl(B1)
FESSI27_028	21(2)	1760(50)	hcp, fcc, NaCl(B1)
FESSI27_029	21(2)	1950(50)	NaCl(B1)
FESSI27_030	20.8(0.3)	300	hcp, fcc, Fe₃S, NaCl(B1)
FESSI36_002	30.8(0.3)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_003	33(4)	1430(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_004	32(3)	1500(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_005	33(4)	1550(50)^c	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_006	33(4)	1660(50)^c	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_007	35(4)	1790(50)	hcp, fcc, NaCl(B2)
FESSI36_008	33(4)	1840(50)	hcp, fcc, NaCl(B2)
FESSI36_009	32(5)	1910(50)^c	fcc, NaCl(B2)
FESSI36_010	34(5)	2010(50)^c	NaCl(B2)
FESSI36_011	34(4)	2030(80)	NaCl(B2)
FESSI36_012	30.7(0.3)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_026	51.1(0.8)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_027	50(4)	1620(50)	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_028	50(4)	1865(50)^c	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_029	49(5)	2150(50)^c	hcp, fcc, NaCl(B2)
FESSI36_030	51(5)	2270(60)	NaCl(B2)
FESSI36_031	47.5(0.2)	300	hcp, fcc, Fe₃S, NaCl(B2)
FESSI36_032	55.0(0.5)	300	hcp, fcc, Fe₃S, NaCl(B2)
Fe-12wt.%S-4wt.%Si
FESSI19_005	24.9(0.1)	300	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI19_006	26(3)	1350(50)	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI19_007	27(3)	1410(50)	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI19_008	26(3)	1390(50)	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI19_009	27(3)	1470(50)	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI19_013	27(3)	1460(50)	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI19_014	27(3)	1610(75)	hcp, NaCl(B1,B2)^e
FESSI19_016	24.4(0.1)	300	hcp, fcc, Fe₃S,NaCl(B1,B2)
FESSI20_002	42.1(0.4)	300	hcp, Fe₃S, NaCl(B2)
FESSI20_003	44(3)	1345(50)	hcp, Fe₃S, NaCl(B2)
FESSI20_004	44(3)	1450(50)	hcp, Fe₃S, NaCl(B2)
FESSI20_005	44(3)	1480(50)	hcp, Fe₃S, NaCl(B2)
FESSI20_006	44(3)	1500(50)	hcp, Fe₃S, NaCl(B2)
FESSI20_007	44(3)	1570(50)	hcp, Fe₃S, NaCl(B2)
FESSI20_008	44(4)	1650(50)	hcp, Fe₃S, NaCl(B2)
FESSI20_013	44(4)	1730(50)	hcp, NaCl(B2)^e
FESSI20_015	42.2(3)	300	hcp, fcc, Fe₃S, NaCl(B2)

The numbers in parentheses show errors
The melting of the sample was detected by disappearance of diffraction pattern
^aThe pressures are based on the EOS of NaCl(B1) (Brown, 1999) and NaCl(B2) (Fei et al., 2007)
^bhcp and fcc represent the structure of Fe−Si alloy
^cThe temperatures are estimated by the laser power
^dhcp-Fe−Si is expected to exist, although it is not observed
^efcc-Fe−Si is expected to exist, although it is not observed in the X-ray diffraction

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