Dielectric Relaxation in Strontium Titanate Solid Solutions Containing Lanthania Export

@article{citeulike:781804, abstract = {The dielectric properties of solid solutions in the system SrTiO\_3-La\_{2/3}TiO\_3 were measured in a frequency range from 200 to 105 Hz and at temperatures from -190 to 400°C. The relative permittivity of the solid solutions is lower that of pure SrTiO\_3 and pronounced dielectric nonlinearity was not observed. Two separate groups of dielectric relaxation peaks were observed, a low temperature relaxation which occured in a temperature region below room temperature and a higher temperature process which occured at about 200°C. The experimental results were analyzed in the light of current theories for relaxation in high permittivity materials. It is suggested that the higher temperature relaxation is associated with a Maxwell-Wagner phenomenon due to the different properties of grain and grain boundaries in the ceramic specimen. For the lower temperature process the evidence is compatible with an ionic model of the Debye type. It is suggested that the existence of the A site vacancy in the perovskite ABO3 lattice introduced by the lanthanum substitution distorts the oxygen octahedron, producing more than one possible ” non central” sites for the Ti4+ ion. The relaxation arises from the thermal motion over potential barriers separating these alternative sites.}, author = {Tien, T. Y. and Cross, L. E.}, citeulike-article-id = {781804}, citeulike-linkout-0 = {http://jjap.ipap.jp/cgi-bin/getarticle?magazine=JJAP&volume=6&page=459&list1=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-7R.html&list2=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-AugL.html&list3=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-6S.html}, journal = {Japaness Journal of Applied Physics}, keywords = {dielectric, relaxation, slto, sto}, pages = {459--468}, posted-at = {2006-08-01 17:20:21}, priority = {2}, title = {Dielectric Relaxation in Strontium Titanate Solid Solutions Containing Lanthania}, url = {http://jjap.ipap.jp/cgi-bin/getarticle?magazine=JJAP&volume=6&page=459&list1=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-7R.html&list2=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-AugL.html&list3=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-6S.html}, volume = {6}, year = {1967} }

TY - JOUR ID - citeulike:781804 L3 - citeulike-article-id:781804 N2 - The dielectric properties of solid solutions in the system SrTiO_3-La_{2/3}TiO_3 were measured in a frequency range from 200 to 105 Hz and at temperatures from -190 to 400°C. The relative permittivity of the solid solutions is lower that of pure SrTiO_3 and pronounced dielectric nonlinearity was not observed. Two separate groups of dielectric relaxation peaks were observed, a low temperature relaxation which occured in a temperature region below room temperature and a higher temperature process which occured at about 200°C. The experimental results were analyzed in the light of current theories for relaxation in high permittivity materials. It is suggested that the higher temperature relaxation is associated with a Maxwell-Wagner phenomenon due to the different properties of grain and grain boundaries in the ceramic specimen. For the lower temperature process the evidence is compatible with an ionic model of the Debye type. It is suggested that the existence of the A site vacancy in the perovskite ABO3 lattice introduced by the lanthanum substitution distorts the oxygen octahedron, producing more than one possible “non central” sites for the Ti4+ ion. The relaxation arises from the thermal motion over potential barriers separating these alternative sites. JF - Japaness Journal of Applied Physics EP - 468 TI - Dielectric Relaxation in Strontium Titanate Solid Solutions Containing Lanthania VL - 6 SP - 459 KW - dielectric KW - relaxation KW - slto KW - sto AU - Tien, TY AU - Cross, LE PY - 1967/// UR - http://jjap.ipap.jp/cgi-bin/getarticle?magazine=JJAP&volume=6&page=459&list1=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-7R.html&list2=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-AugL.html&list3=http%3A%2F%2Fjjap.ipap.jp%2Fjournal%2FJJAP-45-6S.html ER -