Materials Map

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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Freer, Robert

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University of Manchester

in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (61/61 displayed)

  • 2024Enhancing the Performance of SiC-based Varistors through the Use of SPS Processing and Fluxescitations
  • 2024Effect of Graphene Oxide and Carbon Black on the Thermoelectric Performance of Niobium doped Strontium Titanate5citations
  • 2024Electronic transport and the thermoelectric properties of donor-doped SrTiO34citations
  • 2024Effect of graphene oxide and carbon black on the thermoelectric performance of niobium doped strontium titanate5citations
  • 2023Precursor-Led Grain Boundary Engineering for Superior Thermoelectric Performance in Niobium Strontium Titanate.citations
  • 2023High Power Factor Nb-Doped TiO2 Thermoelectric Thick Films: Toward Atomic Scale Defect Engineering of Crystallographic Shear Structures6citations
  • 2023Enhancing the thermoelectric properties of Nb-doped TiO2-based ceramics through in-situ synthesis of β-Sn inclusions at grain boundaries10citations
  • 2023Precursor-Led Grain Boundary Engineering for Superior Thermoelectric Performance in Niobium Strontium Titanate13citations
  • 2023High Power Factor Nb-Doped TiO2 Thermoelectric Thick Films:Toward Atomic Scale Defect Engineering of Crystallographic Shear Structures6citations
  • 2023Enhanced Thermoelectric Performance of Tin(II) Sulfide Thin Films Prepared by Aerosol Assisted Chemical Vapor Deposition9citations
  • 2022Controlling the Thermoelectric Behaviour of La-doped SrTiO3 Through Processing and the Addition of Graphene Oxide7citations
  • 2022Controlling the Thermoelectric Behaviour of La-doped SrTiO3 Through Processing and the Addition of Graphene Oxide7citations
  • 2021Controlling the Thermoelectric Properties of Nb-Doped TiO2 Ceramics through Engineering Defect Structures29citations
  • 2021Modulation of electrical transport in calcium cobaltite ceramics and thick films through microstructure control and doping19citations
  • 2021Modulation of charge transport at grain boundaries in SrTiO3: towards high thermoelectric power factor at room temperaturecitations
  • 2020Enhancing the Thermoelectric Performance of Calcium Cobaltite Ceramics by Tuning Composition and Processing26citations
  • 2020Enhancing the Thermoelectric Performance of Calcium Cobaltite Ceramics by Tuning Composition and Processing26citations
  • 2020Graphene/Strontium Titanate:Approaching Single Crystal–Like Charge Transport in Polycrystalline Oxide Perovskite Nanocomposites through Grain Boundary Engineering45citations
  • 2020The effect of nano-twins on the thermoelectric properties of Ga2O3(ZnO)(m) (m=9, 11, 13 and 15) homologous compounds13citations
  • 2019Anisotropy and Enhancement of Thermoelectric Performance of Sr0.8La0.067Ti0.8Nb0.2O3- δ Ceramics by Graphene Additions36citations
  • 2019Self-Nanostructuring in SrTiO3citations
  • 2019The structure and thermoelectric properties of tungsten bronze Ba6Ti2Nb8O3014citations
  • 2019Enhancement of Electrical Conduction and Phonon Scattering in Ga 2 O 3 (ZnO) 9 -In 2 O 3 (ZnO) 9 Compounds by Modification of Interfaces at the Nanoscale5citations
  • 2019Self-Nanostructuring in SrTiO 3 :A Novel Strategy for Enhancement of Thermoelectric Response in Oxidescitations
  • 2018Utilising unit-cell twinning operators to reduce lattice thermal conductivity in modular structures: Structure and thermoelectric properties of Ga2O3(ZnO)912citations
  • 2018Utilising unit-cell twinning operators to reduce lattice thermal conductivity in modular structures: Structure and thermoelectric properties of Ga2O3(ZnO)912citations
  • 2018Enhancing the thermoelectric power factor of Sr0.9Nd0.1TiO3 through control of the nanostructure and microstructure37citations
  • 2018Improving the thermoelectric properties of SrTiO3-based ceramics with metallic inclusions83citations
  • 2018Enhancement of Electrical Conduction and Phonon Scattering in Ga2O3(ZnO)9-In2O3(ZnO)9 Compounds by Modification of Interfaces at the Nanoscale5citations
  • 2018Enhancing the Thermoelectric Power Factor of Sr0.9Nd0.1TiO3 through Control of the Nanostructure and Microstructure37citations
  • 2018Utilising unit-cell twinning operators to reduce lattice thermal conductivity in modular structures: structure and thermoelectric properties of Ga2O3(ZnO)912citations
  • 2017Multiphysics simulations of thermoelectric generator modules with cold and hot blocks and effects of some factors40citations
  • 2016Tungsten bronze barium neodymium titanate (Ba 6-3n Nd 8+2n Ti 18 O 54 ) an intrinsic nanostructured material and its defect distribution21citations
  • 2016Tuning the thermoelectric properties of A-site deficient SrTiO3 ceramics by vacancies and carrier concentration72citations
  • 2016The role of structure and defect chemistry in high-performance thermoelectric bismuth strontium cobalt oxides22citations
  • 2016Role of Structure and Defect Chemistry in High-Performance Thermoelectric Bismuth Strontium Cobalt Oxides22citations
  • 2016Ba6−3xNd8+2xTi18O54 Tungsten Bronze17citations
  • 2016Tungsten Bronze Barium Neodymium Titanate (Ba(6-3n)Nd(8+2n)Ti(18)O(54))21citations
  • 2015Crystal structure and thermoelectric properties of Sr-Mo substituted CaMnO344citations
  • 2015On the origin of nanochessboard superlattices in a-site-deficient ca-stabilized Nd2/3TiO324citations
  • 2015Thermoelectric power generation from lanthanum strontium titanium oxide at room temperature through the addition of graphene142citations
  • 2015Tuning Thermoelectric Properties of Misfit Layered Cobaltites by Chemically Induced Strain35citations
  • 2013Probing structural changes in Ca(1-x)Nd2x/3TiO3 ceramics by Raman spectroscopy20citations
  • 2012Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics46citations
  • 2012Zn Al 2 O 4 and (0.79) Zn Al 2 O 4-(0.21) Mn 2 TiO 4 microwave dielectric ceramics prepared by hot pressing and spark plasma sintering17citations
  • 2011Microstructure and piezoelectric properties of CuO added (K, Na, Li)NbO3 lead-free piezoelectric ceramics79citations
  • 2010Direct observation of a-site vacancies and a twin boundary structure in La2/3TiO3-based ceramics using HAADF/STEM17citations
  • 2010Fabrication and positive temperature coefficient of resistivity properties of semiconducting ceramics based on the BaTiO3-(Bi1/2K1/2)TiO3 system31citations
  • 2010Enhanced microwave-assisted sintering of X7R ceramic dielectrics for use in multilayer capacitors8citations
  • 2010Microstructure and properties of Co-, Ni-, Zn-, Nb- and W-modified multiferroic BiFeO3 ceramics154citations
  • 2010In-situ X-ray diffraction study of ferroelectric domain switching in orthorhombic nkn ceramics8citations
  • 2009Development of Al2 O3 s(-) TiO2 composite ceramics for high-power millimeter-wave applications27citations
  • 2009The crystal structure of LaAlO3-stabilized La 2/3TiO3 ceramics: An HRTEM investigation11citations
  • 2008Microstructural engineering of microwave dielectric ceramics180citations
  • 2007High-temperature structural phase transition in Ca 0.7Ti 0.7La 0.3Al 0.3O 3: Investigation by synchrotron X-ray diffraction9citations
  • 2007Effect of Al2O3 on the structure and microwave dielectric properties of Ca0.7Ti0.7La0.3Al0.3O338citations
  • 2006Extended X-ray absorption fine structure analysis of (Ca,Nd)(Ti,Al)O3 perovskite ceramics used in cellular base stations5citations
  • 2005Domain structures in perovskite-type lanthanum magnesium titanate ceramics3citations
  • 2005Microstructural control of microwave dielectric properties in CaTiO 3-La (Mg 1/2 Ti 1/2) O 3 ceramics50citations
  • 2002Microwave dielectric properties of Ba(6-3x)Pr(8+2x)Ti18O54 ceramics.citations
  • 2002The effect of CeO2 on the microstructure and dielectric properties of CaTiO3-based ceramics.2citations

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Co-Authors (by relevance)

  • Quadling, Amanda
  • Azough, Feridoon
  • Reece, Michael J.
  • Parsons, Gareth
  • Xia, Xiuqi
  • Liu, Yu
  • Fernandez Garcia, Lucia
  • Zhu, Yibing
  • Galvin, Tom
  • Ekren, Dursun
  • Liu, Xiaodong
  • Kinloch, Ian A.
  • Mudd, Stephanie R.
  • Lewis, Dj
  • Boston, Rebecca
  • Li, Yi
  • Skelton, Jonathan M.
  • Cao, Jianyun
  • Lewis, David J.
  • Kar-Narayan, Sohini
  • Kinloch, Ian
  • Zhong, Xiangli
  • Margaronis, Kalliope
  • Zhao, Minghao
  • Dorey, Robert
  • Kepaptsoglou, Demie
  • Ramasse, Quentin M.
  • Yu, Jincheng
  • Jakubczyk, Ewa
  • Thomas, Andrew
  • Wang, Bing
  • Gao, Zhaohe
  • Guilmeau, Emmanuel
  • Maji, Krishnendu
  • Alvarez-Ruiz, Diana, T.
  • Mcnaughter, Paul D.
  • Kretinin, Andrey V.
  • Kepaptsoglou, Demie M.
  • Ramasse, Quentin
  • Thomas, Andrew G.
  • Chang, Yabin
  • Peng, Yudong
  • Chen, Kan
  • Alvarez-Ruiz, Diana T.
  • Ruiz, Diana Talia Alvarez
  • Kinloch, Ian Anthony
  • Kuo, Jimmy Jiahong
  • Lin, Yue
  • Male, James Patrick
  • Snyder, Gerald Jeffery
  • Dylla, Maxwell Thomas
  • Day, Sarah J.
  • Azough, F.
  • Slater, Thomas
  • Chen, K.
  • Norman, Colin
  • Reece, M. J.
  • Srivastava, Deepanshu
  • Eggeman, Alexander
  • Gholinia, Ali
  • Kepaptsoglou, Dm
  • Day, Sj
  • Jiang, Dongting
  • Reece, Mj
  • Mahajan, Amit
  • Svec, Peter
  • Hernandez-Maldonado, David
  • Duran, Ercin
  • Peter, Svec Sr.
  • Alvarez -Ruiz, Diana T.
  • -Ruiz, Diana T. Alvarez
  • Peter Svec, Sr.
  • Schafer, Marion C.
  • Golinia, Ali
  • Hernandez Maldonado, D.
  • Kepaptsoglou, Despoina Maria
  • Day, Sarah
  • Alvarez -Ruiz, Diana
  • Svec Sr, Peter
  • Baig, H.
  • Gregory, D. H.
  • Paul, M. C.
  • Montecucco, A.
  • Sweet, T.
  • Gao, M.
  • Siviter, J.
  • Han, G.
  • Knox, A. R.
  • Mallick, T. K.
  • Li, W.
  • Maclaren, Ian
  • Ramasse, Quentin Mathieu
  • Parker, Stephen Charles
  • Baran, Jakub Dominik
  • Molinari, Marco
  • Barthel, Juri
  • Cernik, Robert Joseph
  • Schaffer, Bernhard
  • Ali, Amir
  • Bigatti, Marco
  • Schäfer, Marion C.
  • Nicotra, Giuseppe
  • Parker, Stephen C.
  • Baran, Jakub D.
  • Kulwongwit, Nuth
  • Baran, Jd
  • Paul, Manosh
  • Sweet, Tracy
  • Paul, Douglas
  • Siviter, Jonathan
  • Montecucco, Andrea
  • Li, Wenguan
  • Mullen, Paul
  • Man, Elena A.
  • Gregory, Duncan
  • Yeandel, Stephen R.
  • Knox, Andy
  • Min, Gao
  • Han, Guang
  • Sellami, Nazmi
  • Mallick, Tapas
  • Baig, Hasan
  • Srivastava, D. S.
  • Parker, S. C.
  • Molinari, M.
  • Ramasse, Q. M.
  • Baran, J. D.
  • Combe, E.
  • Funahashi, R.
  • Schaffer, Berhnard
  • Simpson, Kevin
  • Wang, Li
  • Robbins, Mark
  • Parker, Steven C.
  • Lowndes, Robert
  • Deluca, Marco
  • Cernik, Robert J.
  • Lorite, Israel
  • Fernandez, Jose Francisco
  • Rodriguez, Miguel Angel
  • Sharma, S.
  • Wegrzyn, M.
  • Hall, David A.
  • Tsurumi, T.
  • Zubair, M. A.
  • Hoshina, T.
  • Shiosaki, T.
  • Takeda, H.
  • Leach, Colin
  • Harinaka, H.
  • Mcinroy, A. B.
  • Rowley, A. T.
  • Thrall, Michael
  • Tuna, Floriana
  • Collison, David
  • Middleton-Stewart, Nichola
  • Mori, Tsutomu
  • Curfs, Caroline
  • Kungl, Hans
  • Taniguchi, T.
  • Spreitzer, M.
  • Annino, G.
  • Fitzpatrick, W.
  • Kolodiazhnyi, T.
  • Panariello, A.
  • Wang, Wenjin
  • Bell, Anthony M. T.
  • Ravi, Guttamindapalli A.
  • Ravi, G. A.
  • Kipkoech, Eric Rop
  • Mosselmans, Julian Frederickwillem
  • Kipkoech, Erick Rop
  • Kipkoech, E. R.
OrganizationsLocationPeople

article

Crystal structure and thermoelectric properties of Sr-Mo substituted CaMnO3

  • Kepaptsoglou, Dm
  • Azough, Feridoon
  • Srivastava, D. S.
  • Parker, S. C.
  • Molinari, M.
  • Ramasse, Q. M.
  • Yeandel, Stephen R.
  • Baran, J. D.
  • Combe, E.
  • Freer, Robert
  • Funahashi, R.
Abstract

<p>A combination of experimental and computational techniques has been employed to study doping effects in perovskite CaMnO3. High quality Sr-Mo co-substituted CaMnO3 ceramics were prepared by the conventional mixed oxide route. Crystallographic data from X-ray and electron diffraction showed an orthorhombic to tetragonal symmetry change on increasing the Sr content, suggesting that Sr widens the transition temperature in CaMnO3 preventing phase transformation-cracking on cooling after sintering, enabling the fabrication of high density ceramics. Atomically resolved imaging and analysis showed a random distribution of Sr in the A-site of the perovskite structure and revealed a boundary structure of 90° rotational twin boundaries across {101}orthorhombic; the latter are predominant phonon scattering sources to lower the thermal conductivity as suggested by molecular dynamics calculations. The effect of doping on the thermoelectric properties was evaluated. Increasing Sr substitution reduces the Seebeck coefficient but the power factor remains high due to improved densification by Sr substitution. Mo doping generates additional charge carriers due to the presence of Mn3+ in the Mn4+ matrix, reducing electrical resistivity. The major impact of Sr on thermoelectric behaviour is the reduction of the thermal conductivity as shown experimentally and by modelling. Strontium containing ceramics showed thermoelectric figure of merit (ZT) values higher than 0.1 at temperatures above 850 K. Ca0.7Sr0.3Mn0.96Mo0.04O3 ceramics exhibit enhanced properties with S1000K = -180 μV K-1, ρ1000K = 5 × 10-5 Ωm, k1000K = 1.8 W m-1 K-1 and ZT ≈ 0.11 at 1000 K.</p>

Topics
  • density
  • perovskite
  • impedance spectroscopy
  • resistivity
  • phase
  • electron diffraction
  • molecular dynamics
  • Strontium
  • random
  • thermal conductivity
  • sintering
  • densification