Crystal growth of La2Hf2O7 by micro-pulling-down method using W crucible

• Published in: Journal of crystal growth 2022-04, Vol.583, p.126547, Article 126547
• Main Authors: Suda, Takahiro, Yokota, Yuui, Horiai, Takahiko, Yamaji, Akihiro, Yoshino, Masao, Hanada, Takashi, Sato, Hiroki, Toyoda, Satoshi, Ohashi, Yuji, Kurosawa, Shunsuke, Kamada, Kei, Yoshikawa, Akira
• Format: Article
• Language: English
• Subjects: A2. Growth from melt; A2. Single crystal growth; B1. Oxides; B2. Phosphors; Cracks; Crucibles; Crystal growth; Crystal pulling; Deoxygenation; Inclusions; Insulators; Melting points; Single crystals; Zirconium dioxide
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2022.126547

•La2Hf2O7 crystals (m.p.: 2418 °C) were grown by the µ-PD method using a W crucible.•The La2Hf2O7 grown at a rate of 2.00 mm/min had some cracks.•The La2Hf2O7 grown at a rate of 0.07 mm/min was transparent without any cracks.•The LHO[0.07 mm/min] had a transmittance of over 70% in the range of 450–800 nm.•The XRC of the LHO[0.07 mm/min] showed a sharp peak with a FWHM of 138 arcsec. La2Hf2O7 crystals with a melting point of ∼2418 °C were grown by the micro-pulling-down method using a W crucible and deoxygenated ZrO2 insulators. A La2Hf2O7 crystal grown at a rate of 0.07 mm/min (LHO[0.07 mm/min]) showed a high transparency without any visible cracks and inclusions, while a La2Hf2O7 crystal grown at a rate of 2.00 mm/min had some cracks. The LHO[0.07 mm/min] crystal had a transmittance of over 70% in the wavelength range of 450–800 nm. The X-ray rocking curve of the LHO[0.07 mm/min] crystal showed a symmetric sharp peak with a full width at half maximum of 138 arcsec. The Laue image revealed that the grown crystals were single crystals.