TEM investigation of Ca-rich plagioclase: Structural fluctuations related to the I1̄-P1̄ phase transition

Péter Németh, Mario Tribaudino, Emiliano Bruno, P R Buseck

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We used transmission electron microscopy (TEM) to understand microstructural changes accompanying the reversible I1̄-P1̄ phase transition in Ca-rich plagioclase as a function of Na content. The transition produces c- and d-type domains that have P1̄ symmetries, and the symmetries of domain walls are I1̄. Based on diffractograms and contrast differences of high-resolution TEM (HRTEM) images, we infer that structural differences occur on a scale of tens of nanometers, giving rise to structural fluctuations. These variations can be followed on a nanometer scale using HRTEM images. We propose a model with a body-centered A1-Si framework and single Ca sites for the I1̄ domains. The P1̄ domains of anorthite with high A1-Si ordering are homogeneous. In contrast, structural fluctuations occur in both anorthite with lower A1-Si ordering and in Na-bearing plagioclase. The magnitudes of the fluctuations decrease with increases in Na content.

Original languageEnglish (US)
Pages (from-to)1080-1086
Number of pages7
JournalAmerican Mineralogist
Volume92
Issue number7
DOIs
StatePublished - Jul 2007

Fingerprint

plagioclase
phase transition
transmission electron microscopy
Bearings (structural)
anorthite
Phase transitions
Transmission electron microscopy
symmetry
Domain walls
High resolution transmission electron microscopy
high resolution
domain wall

Keywords

  • Ca-rich plagioclase
  • HRTEM
  • I1̄-P1̄ phase transition
  • Structural fluctuations

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

TEM investigation of Ca-rich plagioclase : Structural fluctuations related to the I1̄-P1̄ phase transition. / Németh, Péter; Tribaudino, Mario; Bruno, Emiliano; Buseck, P R.

In: American Mineralogist, Vol. 92, No. 7, 07.2007, p. 1080-1086.

Research output: Contribution to journalArticle

Németh, Péter ; Tribaudino, Mario ; Bruno, Emiliano ; Buseck, P R. / TEM investigation of Ca-rich plagioclase : Structural fluctuations related to the I1̄-P1̄ phase transition. In: American Mineralogist. 2007 ; Vol. 92, No. 7. pp. 1080-1086.
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