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Goian V, Kadlec F, Kadlec C, Dabrowski B, Kolesnik S, Chmaissem O, Nuzhnyy D, Kempa M, Bovtun V, Savinov M, Hejtmánek J, Prokleška J, Kamba S. Spectroscopic studies of the ferroelectric and magnetic phase transitions in multiferroic Sr1-xBaxMnO3. J Phys Condens Matter 2016; 28:175901. [PMID: 27023160 DOI: 10.1088/0953-8984/28/17/175901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dielectric response of perovskite Sr1-xBaxMnO3 (x = 0.43 and 0.45) ceramics was investigated using microwave, THz and infrared spectroscopic techniques in order to study the ferroelectric and antiferromagnetic phase transitions with critical temperatures TC ≈ 350 K and TN ≈ 200 K, respectively. The two lowest-frequency polar phonons are overdamped above TN and they exhibit pronounced softening on heating towards TC. Nevertheless, permittivity ε' in the THz range shows only a small anomaly at TC because the phonon contribution to ε' is rather small. The phonons are coupled with a central mode which provides the main contribution to the dielectric anomaly at TC. Thus, the ferroelectric phase transition has characteristics of a crossover from displacive to order-disorder type. At the same time, the intrinsic THz central peak is partially screened by conductivity and related Maxwell-Wagner relaxation, which dominates the microwave and lower-frequency spectra. Below TN, the ferroelectric distortion markedly decreases, which has an influence on the frequencies of both the central and soft modes. Therefore, ε' in the THz range increases at TN on cooling. In spite of the strong spin-phonon coupling near TN, surprisingly no magnetodielectric effect was observed in the THz spectra upon applying magnetic field of up to 7 T, which is in contradiction with the theoretically expected huge magnetoelectric coupling. We explain this fact as due to the insensitivity of TN to magnetic field.
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Affiliation(s)
- V Goian
- Institute of Physics, The Czech Academy of Sciences, Na Slovance 2,182 21 Prague, Czech Republic
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Abughayada C, Dabrowski B, Avdeev M, Kolesnik S, Remsen S, Chmaissem O. Structural, magnetic, and oxygen storage properties of hexagonal Dy1−xYxMnO3+δ. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.05.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Klie RF, Qiao Q, Paulauskas T, Gulec A, Rebola A, Öğüt S, Prange MP, Idrobo JC, Pantelides ST, Kolesnik S, Dabrowski B, Ozdemir M, Boyraz C, Mazumdar D, Gupta A. Observations of Co4+ in a higher spin state and the increase in the Seebeck coefficient of thermoelectric Ca3Co4O9. Phys Rev Lett 2012; 108:196601. [PMID: 23003068 DOI: 10.1103/physrevlett.108.196601] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Indexed: 06/01/2023]
Abstract
Ca3Co4O9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca3Co4O9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4+-ions in a higher spin state compared to that of bulk Ca3Co4O9. The higher Seebeck coefficient makes the Ca3Co4O9 system suitable for many high temperature waste-heat-recovery applications.
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Affiliation(s)
- R F Klie
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois, USA
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Gateshki M, Suescun L, Kolesnik S, Mais J, Dabrowski B. Structural and magnetic study of RFe0.5V0.5O3 (R=Y, Eu, Nd, La) perovskite compounds. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.06.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Qiao Q, Gulec A, Paulauskas T, Kolesnik S, Dabrowski B, Ozdemir M, Boyraz C, Mazumdar D, Gupta A, Klie RF. Effect of substrate on the atomic structure and physical properties of thermoelectric Ca₃Co₄O₉ thin films. J Phys Condens Matter 2011; 23:305005. [PMID: 21719960 DOI: 10.1088/0953-8984/23/30/305005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The incommensurately layered cobalt oxide Ca(3)Co(4)O(9) exhibits an unusually high Seebeck coefficient as a polycrystalline bulk material, making it ideally suited for many high temperature thermoelectric applications. In this paper, we investigate properties of Ca(3)Co(4)O(9) thin films grown on cubic perovskite SrTiO(3), LaAlO(3), and (La(0.3)Sr(0.7))(Al(0.65)Ta(0.35))O(3) substrates and on hexagonal Al(2)O(3) (sapphire) substrates using the pulsed laser deposition technique. X-ray diffraction and transmission electron microscopy analysis indicate strain-free growth of films, irrespective of the substrate. However, depending on the lattice and symmetry mismatch, defect-free growth of the hexagonal CoO(2) layer is stabilized only after a critical thickness and, in general, we observe the formation of a stable Ca(2)CoO(3) buffer layer near the substrate-film interface. Beyond this critical thickness, a large concentration of CoO(2) stacking faults is observed, possibly due to weak interlayer interaction in this layered material. We propose that these stacking faults have a significant impact on the Seebeck coefficient and we report higher values in thinner Ca(3)Co(4)O(9) films due to additional phonon scattering sites, necessary for improved thermoelectric properties.
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Affiliation(s)
- Q Qiao
- Department of Physics, University of Illinois at Chicago, Chicago, IL, USA
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Dabrowski B, Caspi E, Kolesnik S, Chmaissem O, Mais J, Jorgensen J. Synthesis, structure, and magnetic properties of SrMn1−xGaxO3−δ (x=0–0.5) perovskites. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.08.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Caspi E, Avdeev M, Short S, Jorgensen J, Dabrowski B, Chmaissem O, Mais J, Kolesnik S. Synthesis, structure, and properties of randomly mixed and layer-ordered SrMn1−xGaxO3−δ perovskites. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2003.11.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Affiliation(s)
- S. Kolesnik
- Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA
| | - B. Dabrowski
- Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA
| | - J. Mais
- Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA
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Abstract
Anthropometry is a simple reliable method for quantifying body size and proportions by measuring body length, width, circumference (C), and skinfold thickness (SF). More than 19 sites for SF, 17 for C, 11 for width, and 9 for length have been included in equations to predict body fat percent with a standard error of estimate (SEE) range of +/- 3% to +/- 11% of the mean of the criterion measurement. Recent studies indicate that not only total body fat, but also regional fat and skeletal muscle, can be predicted from anthropometrics. Our Rosetta database supports the thesis that sex, age, ethnicity, and site influence anthropometric predictions; the prediction reliabilities are consistently higher for Whites than for other ethnic groups, and also by axial than by peripheral sites (biceps and calf). The reliability of anthropometrics depends on standardizing the caliper and site of measurement, and upon the measuring skill of the anthropometrist. A reproducibility of +/- 2% for C and +/- 10% for SF measurements usually is required to certify the anthropometrist.
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Affiliation(s)
- J Wang
- Body Composition Unit, St. Luke's/Roosevelt Hospital, Columbia University, New York, New York 10025, USA.
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Affiliation(s)
- J Michener
- Body Composition Unit, St. Luke's-Roosevelt Hospital Center, Columbia University, New York, New York 10025, USA.
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Chumak V, Bailiff I, Baran N, Bugai A, Dubovsky S, Fedosov I, Finin V, Haskell E, Hayes R, Ivannikov A, Kenner G, Kirillov V, Khamidova L, Kolesnik S, Liidja G, Likhtarev I, Lippmaa E, Maksimenko V, Meijer A, Minenko V, Pasalskaya L, Past J, Puskar J, Radchuk V, Wieser A. The first international intercomparison of EPR-dosimetry with teeth: first results. Appl Radiat Isot 1996; 47:1281-6. [PMID: 9022185 DOI: 10.1016/s0969-8043(96)00231-x] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Intercomparison of EPR-dosimetric techniques using tooth enamel had been performed in order to check whether the results produced by different laboratories are consistent and accurate. Participants were supposed to evaluate doses applied to pulverized enamel samples, using routine techniques from their laboratories. The intercomparison has demonstrated a great variety of methods used for dose reconstruction. Peculiarities of experimental approaches are discussed systematically in terms of procedure for recording the EPR-spectra, determination of the amplitude of the radiation induced signal, determination of the dose, and error propagation.
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Affiliation(s)
- V Chumak
- Scientific Centre of Radiation Medicine, Academy of Medical Sciences of Ukraine, Kiev, Ukraine.
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Kolesnik S, Skoskiewicz T, Igalson J, Tarnawski Z. Experimental observation of the lock-in transition in a Bi2Sr2CaCu2O8+ delta crystal near the lower critical field. Phys Rev B Condens Matter 1996; 54:13319-13323. [PMID: 9985196 DOI: 10.1103/physrevb.54.13319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wojtowicz T, Kolesnik S, Miotkowski I, Furdyna JK. Magnetization of bound magnetic polarons: Direct determination via photomemory effect. Phys Rev Lett 1993; 70:2317-2320. [PMID: 10053530 DOI: 10.1103/physrevlett.70.2317] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Kolesnik S, Skoskiewicz T, Igalson J, Korczak Z. Anisotropy of flux trapping in Pb2Sr2Y0.3Ca0.7Cu3O8 single crystals. Phys Rev B Condens Matter 1992; 45:10158-10161. [PMID: 10000917 DOI: 10.1103/physrevb.45.10158] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kolesnik S, Skoskiewicz T, Igalson J. Comment on "Uniaxial anisotropic flux trapping in Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O single crystals". Phys Rev B Condens Matter 1991; 43:13679-13680. [PMID: 9997216 DOI: 10.1103/physrevb.43.13679] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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