composing. of sub-micrometer sized lumber particles were synthesized under solvothermal conditions, with the use of mixed water-ethyl alcohol as the reaction medium and the application of the prior ultrasonication as the activation step. The influence of ethyl alcohol on particle shape and size, and the discussed in relative to the conventional hydrothermal cases. The temperature dependent, showing the origin of the losses to stem from the loss of potassium oxide in the dintering process.