Lead oxides, compositions comprising lead oxides and methods of making lead oxides

A method of making a composition comprising alpha lead (II) oxide, the method comprising:

• converting lead citrate into lead carbonate by heating the lead citrate in the presence of an oxidising gas and carbon dioxide, converting the lead carbonate into PbOPbCO3 by heating the lead carbonate;
• and
• heating said PbOPbCO3 in a substantially inert atmosphere.

(canceled)

A method of making a composition comprising beta lead oxide, the method comprising heating lead citrate in a flow of a gas comprising an oxidising agent, the method comprising mixing a precursor gas comprising the oxidising agent with an inert diluent gas to provide the gas comprising the oxidising agent, wherein the molar ratio of the inert diluent gas to the precursor gas is at least 1:10, and no more than 3:1.

(canceled)

A method of making a composition comprising red lead, the method comprising:

• converting lead citrate into lead carbonate by heating the lead citrate in the presence of an oxidising gas and carbon dioxide, converting the lead carbonate into PbOPbCO3;
• and
• converting PbOPbCO3 into alpha lead oxide and converting alpha lead oxide into red lead, by heating the PbOPbCO3 in the presence of a flow of gas comprising an oxidiser at a temperature of at least 350° C.

30-32. (canceled)

(canceled)

A method of making a composition comprising Pb2O3, the method comprising:

• converting lead citrate into lead carbonate by heating the lead citrate in the presence of an oxidising gas and carbon dioxide, converting the lead carbonate into PbOPbCO3;
• and
• converting PbOPbCO3 into alpha lead oxide and converting alpha lead oxide into Pb2O3, by heating the PbOPbCO3 in the presence of a flow of gas comprising an oxidiser at a temperature of no more than 325° C.

36-41. (canceled)

43-45. (canceled)