This is a review and an overview on hydrothermal synthesis of fine oxide po
wders. The term hydrothermal today includes methods which involve water at
pressures (from 1 atm-several kilobars) and high temperatures from 100-10,0
00 degreesC. Hydrothermal is one of the best methods to produce pure fine o
xide powders. The authors describe (i) hydrothermal decomposition, (ii) hyd
rothermal metal oxidation, (iii) hydrothermal reaction, (iv) hydrothermal p
recipitation and hydrothermal hydrolysis, (v) hydrothermal electrochemical,
(vi) reactive electrode submerged are, (vii) hydrothermal microwave, (viii
) hydrothermal sonochemical, etc and also ideal and real powders.