THE ROLE OF TB-DOPING ON THE STRUCTURAL AND FUNCTIONAL PROPERTIES OF BI4?XTBXTI3O12 FERROELECTRIC PHASES WITH THE AURIVILLIUS TYPE STRUCTURE Article Sarkar T., Ivanov S.A., Fortalnova E.A., Politova E.D., Safronenko M.G., Nordblad P., Mathieu R. Journal of Materials Science: Materials in Electronics. Springer New York LLC. Vol. Volume 28 Issue 6. 2017.