W18O49 Prepared by Solid Phase Method

W₁₈O₄₉ can be prepared by solid phase method. During the preparation process, WO₃ powder and urea at a mass ratio of 1:3 are heated in a tube furnace to prepare nanosphere W₁₈O₄₉ with hollow structure. This is an efficient preparation method with low cost.

Solid phase method is one of traditional powder making methods. Here are characteristics of this kind of method as following as:

1. The reaction is carried out at high temperature.

2. The reaction involves material transport. Under certain conditions, atoms or ions move irregularly away from the original equilibrium position of lattice, forming a moving material flow.

3. The reaction involves contact of reactants. The reactants may be mixed.

W₁₈O₄₉ can be prepared by solid phase method, using WO₃ and urea as raw materials. The raw materials are mixed and then heated in a tube furnace under certain conditions.

The specific information about the raw materials are as follow:

1. WO₃

WO₃ is a kind of yellow powder. It is insoluble in water, soluble in alkali and slightly soluble in acid. WO₃ is an important intermediate product. It is usually used to prepare alloy with high melting point. And it is an important raw material for preparing tungsten wire and fireproof materials. Generally, WO₃ can be successfully obtained by melting tungsten ore and soda ash.

2. Urea

Urea is a kind of white crystal. It is a simple organic compound composed of carbon, nitrogen, oxygen and hydrogen. As for its application, it is often used as neutral fertilizer. Urea is suitable for all kinds of soil and plants. It not only has little damage to the soil, but also is easy to preserve. Urea is synthesized with ammonia and carbon dioxide under certain conditions.

Nanosphere W₁₈O₄₉ with hollow structure can be successfully prepared by solid-phase method, using WO₃ and urea as raw materials. The products prepared by this method has high quality. This is a simple preparation method with high efficiency.

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