Abstract

Atom Probe Tomography (APT) analysis of materials is an established technique for atomic level compositional analysis. Extensive research has been performed on many alloys, compounds, multilayered thin films, integrated circuits, and even polymers [1]. While some geological materials, mainly minerals and biominerals, have been previously studied [2-4], the use of APT for the resolution of bulk chemistry of minerals and its relationship to stoichiometry are insufficiently constrained. Often, the mass spectra from natural geological samples exhibit many complex ionic species, and their interpretation can lead to differing determinations of composition.

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