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Field-assisted sintering and phase transition of ZnS-CaLa2S4 composite ceramics

Journal Article · · Journal of the European Ceramic Society
 [1];  [2];  [2];  [1]
  1. Alfred Univ., Alfred, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
In the present study, zinc sulfide (ZnS) and calcium lanthanum sulfide (CaLa2S4, CLS) composite ceramics were consolidated via field-assisted sintering of 0.5ZnS-0.5CLS (volume ratio) composite powders at 800–1050 °C. Through sintering curve analyses and microstructural observations, it was determined that between 800 and 1000 °C, grain boundary diffusion was the main mechanism controlling grain growth for both the ZnS and CLS phases within the composite ceramics. The consolidated composite ceramics were determined to be composed of sphalerite ZnS, wurtzite ZnS and thorium phosphate CLS. The sphalerite-wurtzite phase transition of ZnS was further demonstrated to be accompanied by the formation of stacking faults and twins in the ceramics. Furthermore, it was also found that the addition of the CLS phase improved the indentation hardness of the ceramics relative to pure ZnS by homogeneous dispersion of ZnS and CLS small grains.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1409645
Alternate ID(s):
OSTI ID: 1549595
Report Number(s):
BNL--114702-2017-JA; KC0403020
Journal Information:
Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 15 Vol. 37; ISSN 0955-2219
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

The effect of second phase particles on light transmission of ZnS/diamond nanocomposite journal February 2019
Processing of CaLa 2 S 4 infrared transparent ceramics: A comparative study of HP and FAST/SPS techniques journal December 2019

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