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@ARTICLE{Almeida:189442,
author = {Almeida, Trevor P. and Muxworthy, Adrian R. and Williams,
Wyn and Kasama, Takeshi and Dunin-Borkowski, Rafal},
title = {{M}agnetic characterization of synthetic titanomagnetites:
{Q}uantifying the recording fidelity of ideal synthetic
analogs},
journal = {Geochemistry, geophysics, geosystems},
volume = {15},
number = {1},
issn = {1525-2027},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {FZJ-2015-02609},
pages = {161 - 175},
year = {2014},
abstract = {A series of four synthetic basalts comprising
titanomagnetite (Fe3-xTixO4) grains of varied size and
titanium content have been produced by a glass-ceramic
method. Complementary characterization techniques of X-ray
diffractometry, secondary electron microscopy, and
transmission electron microscopy (TEM) demonstrate the
reaction product composition consisted of mainly Fe3-xTixO4,
pyroxene hedenbergite, fayalite, and SiO2. The samples
exhibit bimodal distributions of larger (<2 µm) and smaller
Fe3-xTixO4 particles (<50 nm in diameter), the latter found
inside pyroxene crystals, as well as the sporadic occurance
of dendritic Fe3-xTixO4 structures. Magnetic measurements
show their bulk characteristics fall into two groups:
Ti-rich titanomagnetite samples with varying Ti content; and
near-stoichiometric magnetite. The TEM technique of off-axis
electron holography allowed for visualization of the
magnetic behavior of the synthetic Fe3-xTixO4 grains. Energy
dispersive X-ray analysis and off-axis electron holography
confirmed the small Fe3-xTixO4 grains (<50 nm) confined
within glassy pyroxene regions to be Fe-rich and single
domain, carrying strong magnetic signals, compared to the
relatively magnetically weak larger Fe3-xTixO4 grains (x ∼
0.6). The large grains in the pure magnetite sample are
shown to be pseudo-single domain in nature. The quenching
process involved in synthesis is considered similar to that
of pillow basalts found at mid-ocean ridges and hence the
reaction products are thought ideal in terms of
characterization and understanding, for the purpose of
studying natural systems.},
cin = {PGI-5},
ddc = {550},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {42G - Peter Grünberg-Centre (PG-C) (POF2-42G41)},
pid = {G:(DE-HGF)POF2-42G41},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000331441500010},
doi = {10.1002/2013GC005047},
url = {https://juser.fz-juelich.de/record/189442},
}