Preparation method of lithium niobate single crystal

[0014] The present embodiment provides a kind of preparation method of lithium niobate single crystal, it comprises the following steps:

[0015] (a) Mix niobium oxide and lithium carbonate at a mass ratio of 79.1:20.9, add water and press into a block mixture (the quality of water does not affect the quality of the product, and can be selected according to personal experience or existing knowledge);

[0016] (b) adding the block mixture into the first heating furnace, raising the temperature of the heating furnace from room temperature to 1150°C at a rate of 8°C / min, and keeping the temperature for 1.5 hours to obtain the initial product;

[0017] (c) Put the initial product into the crucible, place it in the second heating furnace, adjust the seed rod to be concentric with the crucible, heat it to 1360°C to melt it, then cool down to 1330°C, and adjust the speed of the seed rod to 8 rpm, and drop the seed crystal at its lower end into the molten liquid to inoculate the seed c

[0019] The present embodiment provides a kind of preparation method of lithium niobate single crystal, it comprises the following steps:

[0020] (a) niobium oxide and lithium carbonate are mixed in a mass ratio of 79.2: 20.8, and pressed into block mixture after adding water;

[0021] (b) adding the block mixture into the first heating furnace, raising the temperature of the heating furnace from room temperature to 1150 °C at a rate of 10 °C / min, and keeping the temperature for 2 hours to obtain the initial product;

[0022] (c) Put the initial product into the crucible, place it in the second heating furnace, adjust the seed rod to be concentric with the crucible, heat it to 1360°C to melt it, then cool down to 1350°C, and adjust the speed of the seed rod 15 revs / min, and lower the seed crystal at its lower end into the melt to inoculate the seed crystal, and when the diameter of the seed crystal expands to 30 mm, it is pulled up at a speed of 6 mm / hour to grow;

[0023]

[0025] The present embodiment provides a kind of preparation method of lithium niobate single crystal, it comprises the following steps:

[0026] (a) niobium oxide and lithium carbonate are mixed in a mass ratio of 79.187: 20.813, and pressed into block mixture after adding water;

[0027] (b) adding the block mixture into the first heating furnace, raising the temperature of the heating furnace from room temperature to 1150 °C at a rate of 9 °C / min, and keeping the temperature for 1.8 hours to obtain the initial product;

[0028] (c) Put the initial product into the crucible, place it in the second heating furnace, adjust the seed rod to be concentric with the crucible, heat it to melt, then cool down to 1340°C, and adjust the speed of the seed rod to 10 rpm / minute, and drop the seed crystal at its lower end into the molten liquid to inoculate the seed crystal, and when the seed crystal diameter expands to 25mm, pull upwards with a speed of 5mm / hour to grow;

[0029] (d