Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Crucibleless process having movement of discrete droplets or...
Reexamination Certificate
2005-01-28
2009-06-09
Kunemund, Robert M (Department: 1792)
Single-crystal, oriented-crystal, and epitaxy growth processes;
Processes of growth from liquid or supercritical state
Crucibleless process having movement of discrete droplets or...
C117S011000, C117S004000, C117S901000, C117S949000
Reexamination Certificate
active
07544245
ABSTRACT:
Disclosed is a method for producing a barium titanium oxide single crystal piece with a given structure using a containerless solidification process, which comprises the steps of preparing a material made of a barium titanium oxide, controlling the material to be in a levitated state within a levitation furnace, melting the levitated material using a laser, and solidifying the molten material while maintaining the levitated state. In a specific embodiment, a spherical sample having a composition of BaTiO3and a weight of about 20 mg is subjected to a rapid solidification and melting process (temperature gradient: about 700 K/sec) 3 times while levitating the sample in 4.5 atm of air atmosphere using an electrostatic levitation furnace. Then, the re-molten sample is maintained at a temperature just below the melting point of the sample for a given time, and then rapidly cooled at a cooling rate of 300 K/sec to obtain a transparent blue barium titanium oxide single crystal. The single crystal exhibits innovative dielectric characteristics having a large relative permittivity (100,000 or more at room temperature) and a low dielectric loss. In addition, the single crystal has excellent temperature stability allowing the relative permittivity to be gently reduced in the range of room temperature to 70 K.
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Paul-Francois Paradis et al., Non-Contact Density Measurements of Liquid and Undercooled Ceramics, The 24th Japan Symposium on Thermophysical Properties, 2003, p. 71-73.
Ishikawa Takehiko
Paradis Paul-Francois
Yoda Shinichi
Yono Kentei
Japan Aerospace Exploration Agency
Kunemund Robert M
Song Matthew J
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