4.7 Article

Partially stabilized tetragonal ZrO2 whiskers with preferred [001] direction derived from CaF2

Journal

JOURNAL OF MATERIOMICS
Volume 7, Issue 4, Pages 879-885

Publisher

ELSEVIER
DOI: 10.1016/j.jmat.2020.12.004

Keywords

Tetragonal zirconia whisker; Molten salt processing; CaF2; Phase stability; Ion adsorption

Funding

  1. National Natural Science Foundation of China [51662016, 51962014, 52072162]
  2. Key Research and Development Program of Jiangxi Province, China [20192BBEL50022]
  3. Key projects of Youth Fund of Jiangxi Province, China [20202ACBL214006, 20202ACBL214008]
  4. Key Science Foundation of Jiangxi Provincial Department of Education, China [GJJ180699]
  5. Scientific Research Fund of Jiangxi Provincial Education Department [GJJ160881]
  6. Youth Science Foundation of Jiangxi Provincia Department of Education, China [GJJ180740]

Ask authors/readers for more resources

By utilizing CaF2 as a stabilizer and adsorbent in molten salt processing, tetragonal zirconia whiskers with a desired morphology can be synthesized, showing single crystalline nature and a specific aspect ratio.
The simultaneous control of crystal phase stability and one-dimensional growth has always been the major challenge for the preparation of tetragonal zirconia whiskers. In this study, we report a facile molten salt processing that utilizes CaF2 as a stabilizer and adsorbent to meet the phase and morphology requirements. The processes of stabilization, phase transition, ion adsorption and formation of special morphology involved in zirconia growth were investigated by XRD, IR, SEM, DTA-TG and TEM. By controlling the amount of CaF2 (15 wt%) added in the reaction precursor, tetragonal zirconia whiskers with a desired aspect ratio (>16) can be synthesized, which show single crystalline nature and [001] preferred direction. Ca ions doped at low temperature inhibit the occurrence of phase transition, which allows the tetragonal structure to be retained to room temperature. The inducement and pattern of whisker growth are supposed to be F-adsorption and screw dislocation elongation, respectively. The specific selectivity of surface adsorbed ions to certain zirconia crystal planes reduces or even inhibits the epitaxial growth rate in this direction, offering a viable avenue for the morphology modulation of inorganic nanomaterials. (C) 2020 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available