Growth and crystallinity of shaped and multiple sapphire crystals by a micro-pulling-down method

✍ Scribed by Yuui Yokota; Valery Chani; Masato Sato; Kazushige Tota; Ko Onodera; Takayuki Yanagida; Akira Yoshikawa

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 666 KB
• Volume: 318
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2010.10.024

✦ Synopsis

We developed a growth technique of shape-controlled and multiple crystals by a micro-pulling-down (m-PD) method using a developed special configuration crucible. A square tube-shaped sapphire crystal was grown with a molybdenum crucible with square tube die of 4 mm  4 mm outer periphery and 2 mm  2 mm inner periphery on the bottom. In contrast, six multiple square-shaped sapphire crystals were simultaneously grown by a molybdenum crucible with six circularly arranged square-shaped dies with a size of 2  2 mm 2 on the bottom. Growth of six multiple square-shaped sapphire crystals indicated a single phase of a-Al 2 O 3 and almost same lattice parameters by X-ray diffraction measurement.

Crystallinities of the six crystals were high in all positions of crystals comparable to the crystals grown by the Czochralski method.