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Quantitative Dielectric Spectroscopy and Crystallography of Roto-Electric Crystals
Quantitative Dielectric Spectroscopy and Crystallography of Roto-Electric Crystals
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103115
- ISBN
- 9798315730255
- DDC
- 530
- 서명/저자
- Quantitative Dielectric Spectroscopy and Crystallography of Roto-Electric Crystals
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 262 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Rogers, Charles.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약A roto-electric crystal is a novel, synthetic material that contains rotatable, electric dipoles on a lattice. The dipoles are molecular groups with a built-in permanent polarization that are able to rotate on axle-like carbon-carbon bonds. The 2D triangular lattice of rotatable dipoles is predicted to have a ferroelectric ground state with unique properties that could enable the design of tunable resonant circuits at a nanoelectronic scale. Our modular approach to material design utilizes a hexagonal host crystal, with open channels, to trap rotor molecules (containing the rotatable electric dipole), forming rotor inclusion compounds. Previous work has been done with rotor inclusions in powdered form, which allowed the group to quantify the lattice parameters with X-ray scattering and barriers to rotation through dielectric spectroscopy. This thesis seeks to progress our understanding of the dipole-dipole coupling and how the dipoles contribute to the overall dielectric response through two physical refinements: (1) fixing two dipole-rotators on each included rotor molecule to constrain the intra-channel distances between pairs of rotators in the channels, and (2) growing channel aligned, crystalline thin films. The nature of the host crystal leads to two distinct 9-state models for pairs of dipoles that predict different behaviors depending on the dipole-dipole distances. Thin films are grown with aligned channels as confirmed by grazing incidence X-ray experiments, constraining rotations to the plane of the substrate. By measuring the thickness of the films, the dielectric constant can be extracted from capacitor measurements, allowing us to quantify the contribution rotors make to the dielectric properties.
- 일반주제명
- Physics
- 일반주제명
- Chemistry
- 일반주제명
- Materials science
- 일반주제명
- Condensed matter physics
- 일반주제명
- Computational physics
- 키워드
- Dielectrics
- 키워드
- GIWAXS
- 키워드
- Thin films
- 기타저자
- University of Colorado at Boulder Physics
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103115
■006m o d
■007cr#unu||||||||
■020 ▼a9798315730255
■035 ▼a(MiAaPQ)AAI31937004
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aTortorici, Edward Christen.▼0(orcid)0009-0002-4891-594X
■24510▼aQuantitative Dielectric Spectroscopy and Crystallography of Roto-Electric Crystals
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a262 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Rogers, Charles.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼aA roto-electric crystal is a novel, synthetic material that contains rotatable, electric dipoles on a lattice. The dipoles are molecular groups with a built-in permanent polarization that are able to rotate on axle-like carbon-carbon bonds. The 2D triangular lattice of rotatable dipoles is predicted to have a ferroelectric ground state with unique properties that could enable the design of tunable resonant circuits at a nanoelectronic scale. Our modular approach to material design utilizes a hexagonal host crystal, with open channels, to trap rotor molecules (containing the rotatable electric dipole), forming rotor inclusion compounds. Previous work has been done with rotor inclusions in powdered form, which allowed the group to quantify the lattice parameters with X-ray scattering and barriers to rotation through dielectric spectroscopy. This thesis seeks to progress our understanding of the dipole-dipole coupling and how the dipoles contribute to the overall dielectric response through two physical refinements: (1) fixing two dipole-rotators on each included rotor molecule to constrain the intra-channel distances between pairs of rotators in the channels, and (2) growing channel aligned, crystalline thin films. The nature of the host crystal leads to two distinct 9-state models for pairs of dipoles that predict different behaviors depending on the dipole-dipole distances. Thin films are grown with aligned channels as confirmed by grazing incidence X-ray experiments, constraining rotations to the plane of the substrate. By measuring the thickness of the films, the dielectric constant can be extracted from capacitor measurements, allowing us to quantify the contribution rotors make to the dielectric properties.
■590 ▼aSchool code: 0051.
■650 4▼aPhysics
■650 4▼aChemistry
■650 4▼aMaterials science
■650 4▼aCondensed matter physics
■650 4▼aComputational physics
■653 ▼aDielectric spectroscopy
■653 ▼aDielectrics
■653 ▼aGIWAXS
■653 ▼aOrganic thin films
■653 ▼aThin films
■653 ▼aX-ray diffraction
■690 ▼a0605
■690 ▼a0794
■690 ▼a0485
■690 ▼a0611
■690 ▼a0216
■71020▼aUniversity of Colorado at Boulder▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357007▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
