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Title: Electric field effect on chemical and phase equilibria in nano-TiB2–TiO2–TiBO3 system at <650 °C: an in situ time-resolved energy dispersive x-ray diffraction study with an ultrahigh energy synchrotron probe

Journal Article · · Journal of Materials Research
DOI:https://doi.org/10.1557/jmr.2016.466· OSTI ID:1413927
 [1];  [1];  [2];  [3];  [1];  [4];  [1]
  1. Rutgers Univ., Piscataway, NJ (United States). Dept. of Materials Science and Engineering
  2. Selcuk Univ., Konya (Turkey). Metallurgical and Materials Engineering Dept.
  3. Dulumpınar Univ., Kutahya (Turkey). Dept. of Materials Science and Engineering
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source

Nano-TiB2 powder of 58 nm size with TiO2 and TiBO3 as secondary phases was heated with 20 °C to <650 °C in argon while applying an electric field. The powder became conductive at 520 and 305 °C (Tonset) for 16 and 40 V/cm, respectively, at which point current bursts of 4.5 and 10.0 A (peak value) were observed. Current bursts were accompanied by >1% TiB2 unit cell expansion, exceeding zero field thermally induced expansion. The current bursts also induced nonisothermal reaction between TiB2 and TiO2, yielding TiBO3 that is absent with no field. Increase from 16 to 40 V/cm shifts the TiB2 → TiBO3 reaction forward, decreases Tonset but increases reaction rate. Analysis using Van’t Hoff relation, including electrochemical effects, precluded possibility of appreciable Joule heating, which was supported with adiabatic internal temperature calculations. In conclusion, the observed low temperature oxidation of TiB2 to TiBO3 that is electrochemically driven and is mediated by the TiO2 solid electrolyte.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1413927
Report Number(s):
BNL-114453-2017-JA; applab; TRN: US1800588
Journal Information:
Journal of Materials Research, Vol. 32, Issue 02; ISSN 0884-2914
Publisher:
Materials Research SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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