Microstructural features and domain formation in (Ba,Sr) 2TiSi2O8 fresnoites

Chui Ling Wong; Cristiano Ferraris; T. J. White

doi:10.1016/j.jssc.2011.05.009

Microstructural features and domain formation in (Ba,Sr) ₂TiSi₂O₈ fresnoites

Chui Ling Wong^*, Cristiano Ferraris, T. J. White

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr)₂TiSi₂O₈ fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections.

Original language	English
Pages (from-to)	1768-1776
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	184
Issue number	7
DOIs	https://doi.org/10.1016/j.jssc.2011.05.009
Publication status	Published - Jul 2011

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10.1016/j.jssc.2011.05.009

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title = "Microstructural features and domain formation in (Ba,Sr) 2TiSi2O8 fresnoites",

abstract = "The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr)2TiSi2O8 fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections.",

keywords = "(Ba,Sr)-fresnoite, Electron diffraction, Incommensuration, TEM",

author = "Wong, {Chui Ling} and Cristiano Ferraris and White, {T. J.}",

year = "2011",

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TY - JOUR

T1 - Microstructural features and domain formation in (Ba,Sr) 2TiSi2O8 fresnoites

AU - Wong, Chui Ling

AU - Ferraris, Cristiano

AU - White, T. J.

PY - 2011/7

Y1 - 2011/7

N2 - The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr)2TiSi2O8 fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections.

AB - The formation and co-existence of crystallographically modulated and non-modulated regions in (Ba,Sr)2TiSi2O8 fresnoites is reviewed, particularly the dependence on local composition. It is shown that perturbations of the average fresnoite structure, determined from appreciable single crystals, are in some cases better described as nanometric domain intergrowths where departures from ideal stoichiometry are characteristics of incommensuration, while modulation is absent from volumes that are less perturbed chemically. Evidence for this differentiation is obtained from selected area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) images. The domains are readily distinguished by their unique contrast in bright field electron micrographs. Fourier reconstructions of HRTEM images collected from areas with darker contrast show that modulation can change within relatively small volumes. Nearby areas with lighter contrast were found by SAED to be free of structural disorder and incommensurate reflections.

KW - (Ba,Sr)-fresnoite

KW - Electron diffraction

KW - Incommensuration

KW - TEM

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DO - 10.1016/j.jssc.2011.05.009

M3 - Article

SN - 0022-4596

VL - 184

SP - 1768

EP - 1776

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 7

ER -

Microstructural features and domain formation in (Ba,Sr) ₂TiSi₂O₈ fresnoites

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