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DTSTART:20250101T000000
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DTSTART;TZID=Asia/Kolkata:20260409T090000
DTEND;TZID=Asia/Kolkata:20260417T170000
DTSTAMP:20260417T155346
CREATED:20260312T071521Z
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SUMMARY:Foundational workshop on Semiconductor Manufacturing
DESCRIPTION:
URL:https://www.cense.iisc.ac.in/foundational-workshop-on-semiconductor-manufacturing/#new_tab
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DTSTART;TZID=Asia/Kolkata:20260417T160000
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DTSTAMP:20260417T155346
CREATED:20260324T055031Z
LAST-MODIFIED:20260324T055259Z
UID:10151-1776441600-1776445200@www.cense.iisc.ac.in
SUMMARY:[Thesis Colloquium] : Static and Dynamic Defects in Ferroic Materials: Pathways to Functional Responses
DESCRIPTION:Thesis Title: "Static and Dynamic Defects in Ferroic Materials: Pathways to Functional Responses"\n\nName of the Student: Mr. Shubham Kumar Parate\n\nDegree Registered: Ph.D. Engineering \n\nAdvisor: Prof. Pavan Nukala\, CeNSE\n\nDate: 17th April 2026\, (Friday)\, 4 PM\n\nVenue: CeNSE Seminar Hall\n\nAbstract:\n\nCrystalline materials are often described as periodic atomic arrangements\, yet real solids invariably \ncontain defects spanning multiple length scales\, from point vacancies to extended structural \nheterogeneities. Rather than acting only as imperfections\, such defects can reshape the energy \nlandscape of functional materials\, enabling enhanced responses and stabilizing new structural states. \nIn ferroic materials\, where coupled order parameters such as polarization and strain govern functional \nbehavior\, defects can strongly influence switching dynamics\, electromechanical response\, and phase \nstability. This thesis investigates how defects serve as a unifying thread linking property enhancement\, \nmesoscale transformations\, and long-range phase evolution in ferroic oxides and layered chalcogenides\, \nwith particular emphasis on the contrast between static defectlandscapes and dynamically evolving \ndefect networks.\n\nThe first part of this work focuses on defect-engineered BaTiO3\, where predominantly static vacancy \nconfigurations modify lattice anharmonicity and electromechanical coupling. It is shown that \nnon-stoichiometric BaTiO₃ can exhibit a giant electromechanical response even in the absence of \nclassical ferroelectric switching. By tuning defect concentration and distribution\, electric fields \ngenerate unusually large reversible strain\, establishing defect-mediated electrostriction as a pathway \nto strong functionality in nominally non-ferroelectric systems. Complementary in-situ bias transmission \nelectron microscopy studies further attempt to directly visualize polarization switching in BaTiO₃\, \nrevealing how static defect structures guide domain nucleation and propagation.\n\nThe thesis then shifts to layered In2Se3 nanowires\, where defects are not static but dynamically \nreorganize under external stimuli and are explored through combined ex-situ and in-situ transmission \nelectron microscopy.Electrical bias induces coupled interactions among polarization\, interlayer sliding\, \nand strain localization\, while evolving defect intersections act as nucleation sites for structural \ninstability. This results in cascading amorphization events that propagate over long distances\, \ndemonstrating how dynamic defect networks convert local perturbations into collective structural collapse.\n\nThe subsequent chapters further investigate electrically (reversible)\, optically and thermally \ninduced transformations in polymorphs of In₂Se₃. These studies show that defect redistribution \nand mesoscale strain fields govern transformation pathways and reversibility\, with electric bias \nand heat acting as controllable parameters for tuning phase stability.\n\nTogether\, these studies establish a unified framework in which both static and dynamic defects \nfunction as active structural elements that mediate electromechanical coupling\, nucleate phase \ntransitions\, and control switching pathways.This work provides design principles for energy-efficient \nfunctional materials based on metastability and defect-engineered energy landscapes.
URL:https://www.cense.iisc.ac.in/event/thesis-colloquium-static-and-dynamic-defects-in-ferroic-materials-pathways-to-functional-responses/
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