A sharp change in the mineralogy of annealed protoplanetary dust at the glass transition temperature

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Volume 529 (May 2011)

A&A, 529 (2011) A111

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Table 2

Compilation of reported mineralogical assemblages recovered after annealing of different amorphous starting materials of MgSiO₃ composition.

Temperature (K)	Starting Material	Mineralogy^a	Analytical Methods^b	References

Below T_g
723–873	Sol-Gel (OH detected)	En	IR	1
933	Sol-Gel (precipitation)	Fo	XRD/IR	2
970	Sol-Gel (precipitation)	Fo	XRD/IR	2
973	Sol-Gel (xerogel)	Fo	XRD/TEM/SEM/IR	3
996	Glass powder (5–10 μm)	Fo+Trid	TEM/SEM/IR/XRD	4
1000	Laser ablation spherules	Fo+Trid	TEM	4
1000	Smokes	Fo	IR	5
1000	Sol-Gel (precipitation)	Fo	XRD/IR	2
T_g ± 20 K
1023	Sol-Gel (xerogel)	Fo+En	XRD/IR/SEM	6
1030	Glass powder (5–10 μm)	Oen	TEM	4
1033	Glass powder (5–10 μm)	Fo+Cen+Oen	XRD/TEM	3
1053	Sol-Gel (xerogel)	Fo+ En	XRD/IR/SEM	6
1060	Glass powder (5–10 μm)	Oen	TEM	4
1063	Sol-Gel (xerogel)	Fo+En	XRD/IR	6
Above T_g
1073	Laser ablation spherules	En	SEM/IR	7
1073	Sol-Gel (xerogel)	Fo+En	XRD/IR	6
1080	Glass chips (100–130 μm)	Oen	IR/TEM/SEM/XRD	4
1080	Glass powder (5–10 μm)	Oen	TEM	4
1109	Sol-Gel (spray-drying)	Fo+Cen+Oen	XRD/DSC	8
1121	Glass chips (100–130 μm)	Oen	IR/TEM/SEM/XRD	4
1121	Glass powder (5–10 μm)	Oen	TEM	4
1165	Glass chips (100–130 μm)	Oen	IR/TEM	4
1173	Geopolymers	Fo + Oen	XRD/DTA	9
1173	Sol-Gel (precipitation)	Cen+Oen	XRD/DSC	8
1200	Smoke	Fo+Silica	IR	5
1273	Sol-Gel (xerogel)	Fo+Cen+Oen+Silica	XRD/TEM	3
1273	Laser ablation spherules	En	SEM/IR	7
1273	Sol-Gel (xerogel)	Cen+Oen	XRD/DTA	10

References. (1) Jäger et al. (2003); (2) Thompson et al. (2002); (3) Roskosz et al. (2009); (4) Fabian et al. (2000); (5) Hallenbeck & Nuth (1998); (6) Murata et al. (2009); (7) Brucato et al. (1999); (8) Douy (2002); (9) Van Long (2008); (10) Maliavski et al. (1997).

Notes.

^(a)

Fo: forsterite; Trid: tridymite; En: enstatite (no distinctions between polymorphs); Oen: orthoenstatite; Cen: clinoenstatite; Cr: cristobalite.

^(b)

XRD: X-ray diffraction; IR: infra-red spectroscopy; TEM: transmission electron microscopy; SEM: scanning electron microscopy; DSC: differential scanning calorimetry; DTA: differential thermal analysis.

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