Growing method by Ti3O5 by bridgman method

Abstract

The invention provides the bridgman growing method for the growth of Ti3O5 crystal, which include that (1) the raw materials TiO2 and Ti are in proportioning according to Ti3O5 and mixed evenly, pressed. (2) The raw briquetting is loaded in a crucible that then transferred to the inside of a high-temperature decreasing furnace. The whole system is in heating pumping to 10-3-10-4Pa. When the furnace temperature reach 1400 to 1700 DEG degree, an insert protection gas is charged and the furnace is continuously heated to 1800 to 1900 DEG degree. (3) When the temperature reaches the set temperature, the heat is preserved for 3 to 6 hours so that the raw materials can be in full melting. The temperature gradient of solid-liquid interface for the crystal growth is within a framework of 20 to 60 DEG degree / cm, and the crucible decline rate is between 0.1 to 5.0mm / h. (4) After the end of the crystal growth, in an appropriate position inside the growing furnace, the heat is preserved for 10 to 24 hours. Afterwards, the furnace temperature is reduced to the room temperature with the speed of 25 to 80 DEG degree / h. The annealing treatment is implemented for the growing crystals.

Description

technical field

[0001] The invention relates to a crystal growth technology by a crucible drop method, that is, a crucible drop method is used to grow trititanium pentoxide crystals, and belongs to the field of crystal growth. Background technique

[0002] Titanium pentoxide (Ti 3 o 5 ) crystals belong to the orthorhombic system, with a density of ~4.60g / cm3 and a melting point of ~1760°C. Ti 3 o 5 It is a relatively stable compound in the low-priced series of titanium oxides. It has metal-like properties and high conductivity at room temperature. Compared with noble metal electrode materials, it is cheap and has strong acid and alkali corrosion resistance, so it can be used As an electrode material to replace noble metals. Ti 3 o 5 It is a non-stoichiometric compound, O / Ti can vary between 1.66-1.70, it contains a large number of oxygen vacancies, the concentration of quasi-free electrons is high, and its resistance can change with the change of the atmosphere, so it...