Sublimation crystal growth of yttrium nitride |
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| Authors: | Li Du JH Edgar Roberta A Peascoe-Meisner Yinyan Gong Silvia Bakalova Martin Kuball |
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| Institution: | 1. Kansas State University, Department of Chemical Engineering, Durland Hall, Manhattan, KS 66506-5102, USA;2. Department of Materials Science and Engineering, University of Tennessee/High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;3. H.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom |
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| Abstract: | The sublimation–recombination crystal growth of bulk yttrium nitride crystals is reported. The YN source material was prepared by reacting yttrium metal with nitrogen at 1200 °C and 800 Torr total pressure. Crystals were produced by subliming this YN from the source zone, and recondensing it from the vapor as crystals at a lower temperature (by 50 °C). Crystals were grown from 2000 to 2100 °C and with a nitrogen pressure from 125 to 960 Torr. The highest rate was 9.64×10−5 mol/h (9.92 mg/h). The YN sublimation rate activation energy was 467.1±21.7 kJ/mol. Individual crystals up to 200 μm in dimension were prepared. X-ray diffraction confirmed that the crystals were rock salt YN, with a lattice constant of 4.88 Å. The YN crystals were unstable in air; they spontaneously converted to yttria (Y2O3) in 2–4 h. A small fraction of cubic yttria was detected in the XRD of a sample exposed to air for a limited time, while non-cubic yttria was detected in the Raman spectra for a sample exposed to air for more than 1 h. |
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| Keywords: | A1 Crystal morphology A1 Crystal structure A1 X-ray diffraction A2 Growth from vapor B1 Yttrium compounds B1 Nitrides |
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