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Electron imaging of pyrrhotite superstructures.

L Pierce, P R Buseck

Science (New York, N.Y.)

|December 27, 1974

Summary

High-resolution electron microscopy reveals structural heterogeneity in natural pyrrhotites. Superstructures arise from ordered or disordered sequences of antiphase domains, explaining different pyrrhotite types.

Area of Science:

Mineralogy and crystallography
Materials science

Background:

Pyrrhotite, an iron sulfide mineral, exhibits complex structural variations.
Understanding these variations is crucial for interpreting its properties and formation.

Purpose of the Study:

To investigate the crystallographic information of natural pyrrhotites at the unit cell scale.
To elucidate the structural basis of pyrrhotite superstructures using high-resolution electron microscopy.

Main Methods:

High-resolution electron microscopy (HREM) for atomic-scale imaging.
Analysis of crystallographic data derived from HREM.

Main Results:

Structural heterogeneity is a prominent feature in natural pyrrhotite samples.

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Reported superstructures are consistently explained by an antiphase domain model.

The 5C pyrrhotite superstructure is characterized by an ordered sequence of antiphase domains.

The higher-temperature NC type pyrrhotite exhibits a disordered sequence of antiphase domains.

Conclusions:

The antiphase domain model provides a unified framework for understanding pyrrhotite superstructures.
The ordering or disordering of these domains dictates the specific superstructure type and its temperature dependence.