TY - JOUR
T1 - Displacive components of the low-temperature phase transitions in lawsonite
AU - Meyer, Hinrich Wilhelm
AU - Marion, Stefan
AU - Sondergeld, Peter
AU - Carpenter, Michael A.
AU - Knight, Kevin S.
AU - Redfern, Simon A.T.
AU - Dove, Martin T.
PY - 2001/4
Y1 - 2001/4
N2 - The phase transitions in deuterated lawsonite were investigated with high-resolution, time-of-flight neutron diffraction between 2 and 500 K. From the analysis of spontaneous strain data, the thermodynamics of the phase transition at 273 K are not changed by the deuteration process. Shifts in atomic positions with temperature indicate continuous changes for a framework oxygen and for one of the deuterium atoms, whereas for the other deuterium atom, a more discontinuous behavior was observed in the average structure. Comparison of O...D and O...O bond lengths with IR data from a non-deuterated lawsonite permits a detailed analysis of assignments of O-H stretching modes.
AB - The phase transitions in deuterated lawsonite were investigated with high-resolution, time-of-flight neutron diffraction between 2 and 500 K. From the analysis of spontaneous strain data, the thermodynamics of the phase transition at 273 K are not changed by the deuteration process. Shifts in atomic positions with temperature indicate continuous changes for a framework oxygen and for one of the deuterium atoms, whereas for the other deuterium atom, a more discontinuous behavior was observed in the average structure. Comparison of O...D and O...O bond lengths with IR data from a non-deuterated lawsonite permits a detailed analysis of assignments of O-H stretching modes.
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U2 - 10.2138/am-2001-0419
DO - 10.2138/am-2001-0419
M3 - Article
AN - SCOPUS:0035001792
SN - 0003-004X
VL - 86
SP - 566
EP - 577
JO - American Mineralogist
JF - American Mineralogist
IS - 4
ER -