Title :
Sintering mechanism of LiTaO3 ceramics by the addition of lithium and magnesium fluorides
Author :
Ye, Z.G. ; Von Der Mühll, R. ; Ravez, J.
Author_Institution :
Dept. de Chemie Miner., Anal. et Appliquee, Geneve Univ., Switzerland
Abstract :
Highly densified LiNbO3 and LiTaO3 ceramics were obtained by sintering in a moist atmosphere in the presence of LiF and MgF2. The sintering mechanism of LiTaO3 ceramics at low temperatures in the presence of LiF and MgF2 is reported. The sintering temperatures were decreased by 300°C for LiNbO3 and 500°C for LiTaO3. An open air sintering mechanism based on the partial hydrolysis of the starting fluorides and the formation of an intermediate Mg4M 2X9-type (M=Li,Ta; X=O,F,OH) hydroxofluoride phase is proposed, and a three-stage reactional sketch is given
Keywords :
ceramics; ferroelectric materials; lithium compounds; magnesium compounds; sintering; LiF; LiNbO3; LiTaO3 ceramics; MgF2; ferroelectric; highly densified material; hydroxofluoride phase; low temperatures; mechanism; moist atmosphere; partial hydrolysis; sintering; sintering temperatures; three-stage reactional sketch; Atmosphere; Ceramics; Crystals; Ferroelectric materials; Lithium; Magnesium compounds; Phase detection; Pyroelectricity; Temperature; X-rays;
Conference_Titel :
Applications of Ferroelectrics, 1990., IEEE 7th International Symposium on
Conference_Location :
Urbana-Champaign, IL
Print_ISBN :
0-7803-0190-0
DOI :
10.1109/ISAF.1990.200315
