Origins of the macroscopic symmetry breaking in centrosymmetric phases of perovskite oxides

Origins of the macroscopic symmetry breaking in centrosymmetric phases of perovskite oxides

139 Pages · 2017 · 10.29 MB · English

Sohrab, Dara, Nima, Iman, Kasra, Zohreh, Maryam, Elmira, Mahmoud, Fazel, Sareh, Payam,. Baharak, Mohammad, Ali and Hanif. If unknowingly I have not mentioned your name, One is electrostriction, which relates strain and the square of polarization, and the other is flexoelectricity. Both of these 

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POUR L'OBTENTION DU GRADE DE DOCTEUR \310S SCIENCESaccept\351e sur proposition du jury:Dr L W Prof D Damjanovic, directeur de th\350se Prof H Simons, rapporteurDr G Picht, rapporteur Prof P Origins of the macroscopic symmetry breaking in centrosymmetric phases of perovskite oxides TH\310SE N O 8026 \(2017\) \311COLE POL PR\311SENT\311E LE 13 OCT \300 LA GROUPE SCI STI DD PROGRAMME DOCT Suisse2017 PA Sina HASHEMI ZADEH \223Beliefs do not change facts Facts, if you are reasonable, should change your beliefs \224 To my parent Acknowledgments Forematitude to m Dam join his group I am his continues support, for his patience and for his im my first days at EPFL 7 years ago with his superior knowledge and moral traits, and I am extrem I am grateful to Prof Paul M Hugh Sim Wof m acknowledge Prof Francesco Stellacci V exam tructive com quality of m I am r scientific contribution to m A zef Stefan Institute, Dr N Prof Takuya H Technol eisi from CIM I was delighted for working in a lab with a friendly atm who are always ready to share their knowledge and experience Paul Tagant Colla for their usefull com and group m technical and adm om would like to thank Alberto for his kindness and he lp at the earlier stage of m acknowledge all the previous and current m ers of LC, DD and PM m naud, Leo, Davide, Kaushik, Nachi, Petr Y, Thibaut, Yasu, Xiao, Stefan, Cosm Special thanks to Ram Robin for their fri having endless fruitful discussions M i m we spent together, Koosha, Sohrab, Dara, ryam Baharak, assured that I greatly appreciated your assistance At last but not the least, m gratitude goes to m M i have m achieved in m Sina L i Abstract Maturedriven phase transition at the Curie tem rroelectric phase to a paraelectric phase, where the polarization is lost The paraelectric phase is usually centrosym therefore non ite being centrosym lectrics still show of electrom strain and the square of polarization, and the othe r is flexoelectricity B not sym ferroelectrics However, it has been shown that the flexoelectric coefficient of perovskite \(Ba 067 ,S 033 \)T 3 in its centrosym state at room predicted values Experim ily reconciled with theoretical predictions and such enorm ither the theory is unable to fully explain flexoelectric response, or anothe r electromechanical mechanism is playing a role \(partially or comntly large flexoelectric response of the m It has been shown that Ba 060 Sr040 Ti 3 w flexoelectric coefficient exhibit sym bits forbidden piezoelectric and pyroelectric like behavior in its paraelectric phase In this thesis work, our interest lies in describing and interpreting the conditions where breaking of the sym try is not associated w and the flexoelectricity but is proper to the mterial Origins and m breaking were investigated in two different cases : i\) local breaking of centrosym m breaking of the centrosym the existence of m Global sym ith and/ ith the strain gradient in the sam W nd pyroelectric properties of the Ba 1xSrxTi 3 \(B fam 3 in perovskite \(pBTO\) and he xagonal \(hBTO\) form 3 to study the possible governing m g In addition, Ba 06Sr04Ti 3 \(BST6040\) was studied by high resolution scanning transm m to look for direct evidence of polar regions and understand their exact nature and origin A ectric phase of pBTO shows local and global breaking of nom nd possesses m polarizations These polarizations are likely asso ci ferroelectric phase\) ordered by strain gradient in the sam exhibit the m c response at room paraelectricferroelastic precursors H TSC m m Presence of the m eaking in other com Pb\(M 1/3Nb 2/3\)O 3 ceram 3 and also B very different techniques indicate that the sy m ferroelectrics is not only lim rial or preparation procedure and is generally encountered in perovskite m ii Suppression of the pyroelectric

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