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Naveed-Ul-Haq M, Shafiq A, Zia L, Mumtaz A. Experimental and computational study on the influence of cobalt substitution on the structural, impedance, electronic, magnetic, and optical properties of pseudobrookite-structured Fe 2TiO 5. Phys Chem Chem Phys 2023; 25:24581-24593. [PMID: 37661908 DOI: 10.1039/d3cp03655c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
We report on how Co substitution of the Fe sites of pseudobrookite (Fe2TiO5) influences the crystal structure, high-temperature electric permittivity, impedance, electronic structure, magnetic, and optical properties via experimental and theoretical investigations. The pseudobrookite phase contains two types of octahedral sites, Fe atoms reside on type of the sites while Ti on the others and replacing Fe with Co can have a huge influence on one or more physical properties that can render the material more useful for solar energy applications. X-ray diffraction and high-temperature electric permittivity/impedance were the experimental tools used. A temperature range of 20-300 °C and a frequency range of 100 Hz to 1 MHz were used for studying various types of relaxation mechanism via impedance analysis, including grains, grain boundaries, and interfacial effects. To explore the electronic structure, magnetic, and optical properties from first principles, dispersion-corrected density functional theory (PBE-D2/U) was employed. The structure as well as the electric impedance properties are impacted slightly by the Co substitution of Fe in Fe2TiO5 whereas the electronic structure and magnetic properties are influenced significantly. The bandgap is reduced slightly and the average magnetic moment per Fe ion is reduced upon Co substitution of Fe in Fe2TiO5.
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Affiliation(s)
- M Naveed-Ul-Haq
- Department of Physics, Rawalpindi Women University, 6th Road, Satellite Town, 46300 Rawalpindi, Pakistan.
| | - Anum Shafiq
- Department of Physics, Quaid-i-Azam University Islamabad, Pakistan
| | - Layiq Zia
- Department of Physics, Quaid-i-Azam University Islamabad, Pakistan
| | - Arif Mumtaz
- Department of Physics, Quaid-i-Azam University Islamabad, Pakistan
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Lomanova NA, Tomkovich MV, Osipov AV, Ugolkov VL, Panchuk VV, Semenov VG, Gusarov VV. Formation of Bim
+ 1Fem
– 3Ti3O3m
+ 3 (m = 4–9) Nanocrystals upon Thermal Decomposition of Coprecipitated Hydroxides. RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s0036023621050090] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Gemmi M, Mugnaioli E, Gorelik TE, Kolb U, Palatinus L, Boullay P, Hovmöller S, Abrahams JP. 3D Electron Diffraction: The Nanocrystallography Revolution. ACS CENTRAL SCIENCE 2019; 5:1315-1329. [PMID: 31482114 PMCID: PMC6716134 DOI: 10.1021/acscentsci.9b00394] [Citation(s) in RCA: 203] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Indexed: 05/20/2023]
Abstract
Crystallography of nanocrystalline materials has witnessed a true revolution in the past 10 years, thanks to the introduction of protocols for 3D acquisition and analysis of electron diffraction data. This method provides single-crystal data of structure solution and refinement quality, allowing the atomic structure determination of those materials that remained hitherto unknown because of their limited crystallinity. Several experimental protocols exist, which share the common idea of sampling a sequence of diffraction patterns while the crystal is tilted around a noncrystallographic axis, namely, the goniometer axis of the transmission electron microscope sample stage. This Outlook reviews most important 3D electron diffraction applications for different kinds of samples and problematics, related with both materials and life sciences. Structure refinement including dynamical scattering is also briefly discussed.
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Affiliation(s)
- Mauro Gemmi
- Center
for Nanotechnology Innovation@NEST, Istituto
Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy
| | - Enrico Mugnaioli
- Center
for Nanotechnology Innovation@NEST, Istituto
Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy
| | - Tatiana E. Gorelik
- University
of Ulm, Central Facility for Electron Microscopy, Electron Microscopy
Group of Materials Science (EMMS), Albert Einstein Allee 11, 89081 Ulm, Germany
| | - Ute Kolb
- Institut
für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, 55128 Mainz, Germany
- Institut
für Angewandte Geowissenschaften, Technische Universität Darmstadt, Schnittspahnstraße 9, 64287 Darmstadt, Germany
| | - Lukas Palatinus
- Department
of Structure Analysis, Institute of Physics
of the CAS, Na Slovance 2, 182 21 Prague 8, Czechia
| | - Philippe Boullay
- CRISMAT,
Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508, 6 Bd Maréchal Juin, F-14050 Cedex Caen, France
| | - Sven Hovmöller
- Inorganic
and Structural Chemistry, Department of Materials and Environmental
Chemistry, Stockholm University, 106 91 Stockholm, Sweden
| | - Jan Pieter Abrahams
- Center
for Cellular Imaging and NanoAnalytics (C−CINA), Biozentrum, Basel University, Mattenstrasse 26, CH-4058 Basel, Switzerland
- Department
of Biology and Chemistry, Paul Scherrer
Institut (PSI), CH-5232 Villigen PSI, Switzerland
- Leiden
Institute of Biology, Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands
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4
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Mugnaioli E, Gorelik TE. Structure analysis of materials at the order–disorder borderline using three-dimensional electron diffraction. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS 2019; 75:550-563. [DOI: 10.1107/s2052520619007339] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 05/20/2019] [Indexed: 11/10/2022]
Abstract
Diffuse scattering, observed as intensity distribution between the Bragg peaks, is associated with deviations from the average crystal structure, generally referred to as disorder. In many cases crystal defects are seen as unwanted perturbations of the periodic structure and therefore they are often ignored. Yet, when it comes to the structure analysis of nano-volumes, what electron crystallography is designed for, the significance of defects increases. Twinning and polytypic sequences are other perturbations from ideal crystal structure that are also commonly observed in nanocrystals. Here we present an overview of defect types and review some of the most prominent studies published on the analysis of defective nanocrystalline structures by means of three-dimensional electron diffraction.
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Steciuk G, David A, Petříček V, Palatinus L, Mercey B, Prellier W, Pautrat A, Boullay P. Precession electron diffraction tomography on twinned crystals: application to CaTiO 3 thin films. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576719005569] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
Strain engineering via epitaxial thin-film synthesis is an efficient way to modify the crystal structure of a material in order to induce new features or improve existing properties. One of the challenges in this approach is to quantify structural changes occurring in these films. While X-ray diffraction is the most widely used technique for obtaining accurate structural information from bulk materials, severe limitations appear in the case of epitaxial thin films. This past decade, precession electron diffraction tomography has emerged as a relevant technique for the structural characterization of nano-sized materials. While its usefulness has already been demonstrated for solving the unknown structure of materials deposited in the form of thin films, the frequent existence of orientation variants within the film introduces a severe bias in the structure refinement, even when using the dynamical diffraction theory to calculate diffracted intensities. This is illustrated here using CaTiO3 films deposited on SrTiO3 substrates as a case study. By taking into account twinning in the structural analysis, it is shown that the structure of the CaTiO3 films can be refined with an accuracy comparable to that obtained by dynamical refinement from non-twinned data. The introduction of the possibility to handle twin data sets is undoubtedly a valuable add-on and, notably, paves the way for a successful use of precession electron diffraction tomography for accurate structural analyses of thin films.
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Steciuk G, Barrier N, Pautrat A, Boullay P. Stairlike Aurivillius Phases in the Pseudobinary Bi 5Nb 3O 15-ABi 2Nb 2O 9 (A = Ba and Sr) System: A Comprehensive Analysis Using Superspace Group Formalism. Inorg Chem 2018; 57:3107-3115. [PMID: 29474066 DOI: 10.1021/acs.inorgchem.7b03026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the possibility of extending the so-called stairlike Aurivilius phases in the pseudobinary Bi5Nb3O15-ABi2Nb2O9 (A = Ba and Sr) over a wide range of compositions. These phases are characterized by a discontinuous stacking of [Bi2O2] slabs and perovskite blocks, leading to long-period intergrowths stabilized as a single phase. When analyses from precession electron diffraction tomography and X-ray and neutron powder diffraction are combined, the monoclinic incommensurately modulated structure with q = αa* + γc* previously proposed for the ABi7Nb5O24 composition could be generalized to the Bi5Nb3O15-ABi2Nb2O9 (A = Ba and Sr) compounds. Considering the compositions expressed as (A,Bi)1- xNb xO3-3 x, the stacking sequence associated with compositions ranging from x = 2/5 to 3/8 is governed by the component γ of the modulation vector and can be predicted following a Farey tree hierarchy independently to the A cation. The length of the steps, characteristic of the stairlike nature, is controlled by the α component and depends on the substitution ratio A/Bi and the nature of A (A = Ba and Sr). This study highlights the compositional flexibility of stairlike Aurivillius phases.
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Affiliation(s)
- Gwladys Steciuk
- CRISMAT, Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508 , 6 Bd Maréchal Juin , F-14050 Caen Cedex 4 , France.,Institute of Physics of the Czech Academy of Sciences , Na Slovance 2 , Prague , Czech Republic
| | - Nicolas Barrier
- CRISMAT, Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508 , 6 Bd Maréchal Juin , F-14050 Caen Cedex 4 , France
| | - Alain Pautrat
- CRISMAT, Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508 , 6 Bd Maréchal Juin , F-14050 Caen Cedex 4 , France
| | - Philippe Boullay
- CRISMAT, Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508 , 6 Bd Maréchal Juin , F-14050 Caen Cedex 4 , France
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Li L, Boullay P, Lu P, Wang X, Jian J, Huang J, Gao X, Misra S, Zhang W, Perez O, Steciuk G, Chen A, Zhang X, Wang H. Novel Layered Supercell Structure from Bi 2AlMnO 6 for Multifunctionalities. NANO LETTERS 2017; 17:6575-6582. [PMID: 28968496 DOI: 10.1021/acs.nanolett.7b02284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Layered materials, e.g., graphene and transition metal (di)chalcogenides, holding great promises in nanoscale device applications have been extensively studied in fundamental chemistry, solid state physics and materials research areas. In parallel, layered oxides (e.g., Aurivillius and Ruddlesden-Popper phases) present an attractive class of materials both because of their rich physics behind and potential device applications. In this work, we report a novel layered oxide material with self-assembled layered supercell structure consisting of two mismatch-layered sublattices of [Bi3O3+δ] and [MO2]1.84 (M = Al/Mn, simply named BAMO), i.e., alternative layered stacking of two mutually incommensurate sublattices made of a three-layer-thick Bi-O slab and a one-layer-thick Al/Mn-O octahedra slab in the out-of-plane direction. Strong room-temperature ferromagnetic and piezoelectric responses as well as anisotropic optical property have been demonstrated with great potentials in various device applications. The realization of the novel BAMO layered supercell structure in this work has paved an avenue toward exploring and designing new materials with multifunctionalities.
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Affiliation(s)
- Leigang Li
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
- Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Philippe Boullay
- Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508, 6 Boulevard Maréchal Juin, F-14050 Caen Cedex 4, France
| | - Ping Lu
- Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | - Xuejing Wang
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Jie Jian
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Jijie Huang
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Xingyao Gao
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Shikhar Misra
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Wenrui Zhang
- Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Olivier Perez
- Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508, 6 Boulevard Maréchal Juin, F-14050 Caen Cedex 4, France
| | - Gwladys Steciuk
- Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), Normandie Université, ENSICAEN, UNICAEN, CNRS UMR 6508, 6 Boulevard Maréchal Juin, F-14050 Caen Cedex 4, France
| | - Aiping Chen
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Xinghang Zhang
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
| | - Haiyan Wang
- School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States
- Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
- Department of Electrical and Computer Engineering, Texas A&M University , College Station, Texas 77843, United States
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