Bismuth oxide

Niobium and oxygen can form a series of oxides, including Sb 2 O 3 , Sb 2 O 4 , Sb 2 O 5 , Sb 6 O 13 , Sb 2 O and gaseous SbO, but only the first three have industrial significance. The other oxides are mostly transition products in different production processes. The physical and chemical properties of cerium oxide are listed in the following table.

Table Physical and chemical properties of cerium oxide

species

Physical properties

Chemical properties

Antimony trioxide

Sb 2 O 3

It is a white powder at normal temperature, yellow when heated, and has two crystal systems of cubic and orthorhombic, and the temperature at which the cube is converted to the orthorhombic is 570 °C. The cubic system is composed of Sb 4 O 6 molecular composition, the density is 5.28g∕cm 3 , the orthorhombic crystal is 5.67g∕cm 3 , the melting point is 656°C, the heat of evaporation is 36.33～37.29kJ∕mol, and the boiling point is 1327°C according to different data. 1435 ° C;

The relationship between vapor pressure (Pa) and temperature is:

Cubic crystal form Sb 2 O 3 lgp=14.320～10357∕T

Orthorhombic crystal form Sb 2 O 3 lgp=13.433～9625∕T

Liquid Sb 2 O 3 lgp=7.443-3900/T

Antimony or antimony sulfide volatilized out by heating in air the Sb 2 O 3, mostly cubic system; generated by hydrolysis of SbCl 3 Sb 2 O 3 is rhombic. Sb 2 O 3 is an amphoteric oxide with a solubility in water of only 0.01 g ∕L, and is also insoluble in dilute sulfuric acid and dilute nitric acid, which can be oxidized to a high valence oxide. Soluble form thio antimonite alkaline metal sulfides, can completely dissolve

Tartaric acid, if dissolved in potassium tartrate, forms bismuth potassium tartrate, which is a tartar. Sb 2 O 3 is easily reduced to metal by C or CO

Antimony tetraoxide

Sb 2 O 4

The white crystal belongs to the cubic crystal system, and the density is 6.59~7.5g∕cm 3 , and the heat is generated -895.811kJ∕mol

It has the characteristics of non-melting and non-volatile. When the optimum temperature is 500-900 ° C, the dissociation starts at over 900 ° C, and the dissociation can be completely dissociated at 1030 ° C. Slightly soluble in water, soluble in hydrochloric acid, insoluble in other acids, but soluble in alkaline solution. The molecular formula can be written as SbO 2 , and its composition can be considered as a mixed crystal of Sb 2 O 3 and Sb 2 O 5 .

Antimony pentoxide

Sb 2 O 5

a brownish yellow powder with a molecular formula of Sb 2 O 5 ·nH 2 O, approximately equivalent to Sb 2 O 5 ·3.5H 2 O, which can be obtained by hydrolysis of SbCl 4 and heated to 700 ° C to become a white powder.

It is generally considered to be a colloid of hydrate, slightly soluble in water, insoluble in nitric acid, soluble in alkaline solution.

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