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Title: Time-of-flight neutron total scattering with applied electric fields: Ex situ and in situ studies of ferroelectric materials

Abstract

Characterizing the structural response of functional materials (e.g., piezoelectrics and ferroelectrics) to electric fields is key for the creation of structure-property relationships. Here in this paper, we present a new sample environment and data reduction routines which allow the measurement of time-of-flight neutron total scattering during the in situ or ex situ application of high voltage (<10 kV) to a sample. Instead of utilizing the entire detector space of the diffractometer, only selected regions of detector pixels with scattering at the desired angle to the sample electric field are interrogated, which allows the generation of orientation-dependent reciprocal space patterns and real-space pair distribution functions (PDFs). We demonstrate the method using the relaxor ferroelectric Na 1/2Bi 1/2TiO 3 and observe lattice expansion parallel and contraction perpendicular to the electric field for both in situ or ex situ experiments, revealing the irreversible nature of the local scale structural changes to this composition. Additionally, changes in the distributions of nearest neighbor metal-oxygen bond lengths are observed, which have been difficult to observe in previously measured analogous orientation-dependent X-ray PDFs. Lastly, considerations related to sample positioning and background subtraction are discussed, and future research directions are suggested.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [3];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  2. University of Leeds (United Kingdom). School of Chemical and Process Engineering
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Materials Measurement Science Division
  4. North Carolina State Univ., Raleigh, NC (United States). Department of Materials Science and Engineering
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1474610
Alternate Identifier(s):
OSTI ID: 1472216
Grant/Contract Number:  
AC05-00OR22725; KC040602
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Usher, Tedi-Marie, Forrester, Jennifer S., McDonnell, Marshall T., Neuefeind, Joerg C., Page, Katharine L., Peterson, Peter F., Levin, I., and Jones, Jacob L. Time-of-flight neutron total scattering with applied electric fields: Ex situ and in situ studies of ferroelectric materials. United States: N. p., 2018. Web. doi:10.1063/1.5037609.
Usher, Tedi-Marie, Forrester, Jennifer S., McDonnell, Marshall T., Neuefeind, Joerg C., Page, Katharine L., Peterson, Peter F., Levin, I., & Jones, Jacob L. Time-of-flight neutron total scattering with applied electric fields: Ex situ and in situ studies of ferroelectric materials. United States. doi:10.1063/1.5037609.
Usher, Tedi-Marie, Forrester, Jennifer S., McDonnell, Marshall T., Neuefeind, Joerg C., Page, Katharine L., Peterson, Peter F., Levin, I., and Jones, Jacob L. Mon . "Time-of-flight neutron total scattering with applied electric fields: Ex situ and in situ studies of ferroelectric materials". United States. doi:10.1063/1.5037609. https://www.osti.gov/servlets/purl/1474610.
@article{osti_1474610,
title = {Time-of-flight neutron total scattering with applied electric fields: Ex situ and in situ studies of ferroelectric materials},
author = {Usher, Tedi-Marie and Forrester, Jennifer S. and McDonnell, Marshall T. and Neuefeind, Joerg C. and Page, Katharine L. and Peterson, Peter F. and Levin, I. and Jones, Jacob L.},
abstractNote = {Characterizing the structural response of functional materials (e.g., piezoelectrics and ferroelectrics) to electric fields is key for the creation of structure-property relationships. Here in this paper, we present a new sample environment and data reduction routines which allow the measurement of time-of-flight neutron total scattering during the in situ or ex situ application of high voltage (<10 kV) to a sample. Instead of utilizing the entire detector space of the diffractometer, only selected regions of detector pixels with scattering at the desired angle to the sample electric field are interrogated, which allows the generation of orientation-dependent reciprocal space patterns and real-space pair distribution functions (PDFs). We demonstrate the method using the relaxor ferroelectric Na1/2Bi1/2TiO3 and observe lattice expansion parallel and contraction perpendicular to the electric field for both in situ or ex situ experiments, revealing the irreversible nature of the local scale structural changes to this composition. Additionally, changes in the distributions of nearest neighbor metal-oxygen bond lengths are observed, which have been difficult to observe in previously measured analogous orientation-dependent X-ray PDFs. Lastly, considerations related to sample positioning and background subtraction are discussed, and future research directions are suggested.},
doi = {10.1063/1.5037609},
journal = {Review of Scientific Instruments},
number = 9,
volume = 89,
place = {United States},
year = {2018},
month = {9}
}

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Figures / Tables:

Figure 1 Figure 1: (a) Schematic of the NOMAD detector layout with 50 detector 8-packs. The black dot in the center indicates the sample position. The neutron beam (black line) enters from the center of the 154° detector on the left side of the schematic. (b) Neutron diffraction patterns from the 6more » default NOMAD detector banks (labeled by their average in-plane scattering angle) for Na1/2Bi1/2TiO3, demonstrating the varying $Q$-ranges and $Q$-resolutions.« less

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