Drifting inwards in protoplanetary discs I Sticking of chondritic dust at increasing temperatures

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Table 1

Mössbauer parameters of all iron-bearing phases identified in the spectrum of the unheated sample measured at room temperature.

Mineral	δ [mm s ⁻¹]	2ε∕ΔE_Q [mm s⁻¹]	B_HF [T]	A [%]
Olivine	1.16 ± 0.00	2.94 ± 0.00	–	36.8 ± 0.4
Pyroxene	1.16 ± 0.01	2.06 ± 0.01	–	12.2 ± 0.1
Fe₃O₄ A-/B-site	0.36 ± 0.05	0	49.1 ± 1.0	11.1 ± 0.2
SPM Fe₃O₄	0.37 ± 0.01	0.88 ± 0.02	–	34.9 ± 0.4
α-(Fe,Ni)	0.02 ± 0.03	0	33.3 ± 0.2	4.9 ± 0.1

Notes. The table lists: isomer shift δ relative to α-Fe at room temperature; nuclear quadrupole level shift 2ɛ (sextets), respectively, quadrupole splitting ΔE_Q (doublets); hyperfine magnetic field B_HF; and relative spectral area A. Values without an error were fixed during the fitting procedure.

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