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Broadening of Diffraction Peak Widths and Temperature Nonuniformity During Flash Experiments

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14326· OSTI ID:1401856
 [1];  [2];  [3];  [3];  [2];
  1. Department of Mechanical Engineering University of Colorado at Boulder Boulder Colorado 80309‐0427, Northboro Research &, Development Center Saint‐Gobain Innovative Materials Northboro Massachusetts 01532
  2. Department of Mechanical Engineering University of Colorado at Boulder Boulder Colorado 80309‐0427
  3. Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801
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Thermal expansion arising from Joule heating produces shifts in the diffraction peaks. The shifts are calibrated against the platinum standard to determine the specimen temperature during in ‐situ experiments at the Advanced Photon Source. Temperature gradients within the specimen cause the peaks to shift differently from different parts of the specimen. If the beam travels through the specimen the diffraction peak would broaden as a result of the nonuniform temperature. We report extensive measurements of peak widths in flash experiments over power dissipation levels that range from 300 to 2500 mW/mm 3 . Peak broadening occurs only above a critical power level. The broadening is transient, occurring only near the spike in power dissipation when the power supply is switched from voltage to current control (Stage II); it is estimated to arise from a nonuniformity of ~100°C within the specimen. The broadening subsides in the ensuing state of steady‐state flash under current control (Stage III).

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER46403; AC02-06CH11357
OSTI ID:
1401856
Alternate ID(s):
OSTI ID: 1536746
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 99; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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Emergence and Extinction of a New Phase During On–Off Experiments Related to Flash Sintering of 3 YSZ journal January 2015
Predicting the Onset of Flash Sintering journal May 2015
The Change of X‐ray Diffraction Peak Width During in situ Conventional Sintering of Nanoscale Powders journal October 2015

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