Process for preparing barium titanate single crystals

C - Chemistry – Metallurgy – 30 – B

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C30B 29/32 (2006.01) C30B 11/00 (2006.01) C30B 15/00 (2006.01)

Patent

CA 2079936

A mixture of titanium dioxide and an oxide or carbonate of barium includes one or more transition metal elements selected from the group of V, Cr, Mn, Fe, Co, Ni and Cu, in the amount of 2 ppm or more. This mixture is used as a starting material. The mixture is heated to a predetermined temperature to make a melt. Then, a seed crystal of BaTiO3 is brought into contact with the melt under an environment with a low oxygen partial pressure of 0.02 atm. or less. From this state, the above melt is slowly cooled to grow a single crystal on the seed crystal. The thus obtained single crystal is heated in a temperature of 600 °C or more, under an oxidizing environment with its oxygen partial pressure more than 0.1 atm.

Un mélange de dioxyde de titane et d'un oxyde ou carbonate de baryum comprend un ou plusieurs métaux de transition choisis parmi le groupe constitué de V, Cr, Mn, Fe, Co, Ni et Cu, dans une quantité de 2 ppm ou plus. Ce mélange est utilisé comme matière de départ. Le mélange est chauffé à une température prédéterminée pour obtenir une matière fondue. Un cristal germe de BaTiO3 est mis en contact avec la matière fondue dans un environnement caractérisé par une faible pression partielle d'oxygène de 0,02 atm ou moins. De cet état, la matière fondue est lentement refroidie pour faire croître un monocristal sur le germe. Le monocristal ainsi obtenu est chauffé à une température de 600 degrés C ou plus, dans un environnement oxydant dans lequel la pression partielle d'oxygène est supérieure à 0,1 atm.

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