W. E. LEE, Department of Engineering Materials, The University of Sheffield Sheffield, UK and A. BELL, Laboratoire de Ceramique Ecole Polytechnique Federate de Lausanne, Switzerland.
W. E. LEE, Department of Engineering Materials, The University of Sheffield Sheffield, UK and A. BELL, Laboratoire de Ceramique Ecole Polytechnique Federate de Lausanne, Switzerland.