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  1. Article: Hard Magnetic Properties and the Features of Nanostructure of High-Temperature Sm-Co-Fe-Cu-Zr Magnet with Abnormal Temperature Dependence of Coercivity.

    Golovnia, O A / Popov, A G / Mushnikov, N V / Protasov, A V / Pradeep, K G / Ogurtsov, A V / Taranov, D V / Tishin, A M

    Nanomaterials (Basel, Switzerland)

    2023  Volume 13, Issue 13

    Abstract: This paper presents methods and approaches that can be used for production of Sm-Co-Fe-Cu-Zr permanent magnets with working temperatures of up to 550 °C. It is shown that the content of Sm, Cu, and Fe significantly affects the coercivity ( ...

    Abstract This paper presents methods and approaches that can be used for production of Sm-Co-Fe-Cu-Zr permanent magnets with working temperatures of up to 550 °C. It is shown that the content of Sm, Cu, and Fe significantly affects the coercivity (
    Language English
    Publishing date 2023-06-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano13131899
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  2. Article ; Online: Combinatorial evaluation of phase formation and magnetic properties of FeMnCoCrAl high entropy alloy thin film library.

    Marshal, A / Pradeep, K G / Music, D / Wang, L / Petracic, O / Schneider, J M

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 7864

    Abstract: We report on the influence of the Al content (from 3.5 to 54 at.%) on phase formation and magnetic properties in FeMnCoCrAl high entropy alloy thin film libraries. Al additions to FeMnCoCr crystallizing in the alpha-Mn structure cause the formation of ... ...

    Abstract We report on the influence of the Al content (from 3.5 to 54 at.%) on phase formation and magnetic properties in FeMnCoCrAl high entropy alloy thin film libraries. Al additions to FeMnCoCr crystallizing in the alpha-Mn structure cause the formation of the body centered cubic (BCC) structure. This is consistent with density functional theory predictions as Al additions give rise to a larger stability for the BCC phase compared to the face centered cubic phase (FCC) which can be rationalized by the formation of a pseudogap at the Fermi level indicating the stabilization of the BCC phase over the FCC phase. Al additions to paramagnetic FeMnCoCr induce ferromagnetism. The largest saturation magnetization was measured for the film containing 8 at.% of Al. As the concentration of non-ferromagnetic Al is increased beyond 8 at.%, the number density of the ferromagnetic species is decreased causing a concomitant decrease in magnetization. This trend is consistent with ab initio predictions of the Al concentration induced changes in the magnetic moment. Based on the experimental and theoretical results presented here the effect of the Al concentration on the phase formation and the magnetic properties of FeMnCoCrAl thin film library can be rationalized.
    Language English
    Publishing date 2019-05-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-44351-8
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  3. Article ; Online: Atomic scale study of CU clustering and pseudo-homogeneous Fe-Si nanocrystallization in soft magnetic FeSiNbB(CU) alloys.

    Pradeep, K G / Herzer, G / Raabe, D

    Ultramicroscopy

    2015  Volume 159 Pt 2, Page(s) 285–291

    Abstract: A local electrode atom probe has been employed to trace the onset of Cu clustering followed by their coarsening and subsequent growth upon rapid (10s) annealing of an amorphous Fe73.5Si15.5Cu1Nb3B7 alloy. It has been found that the clustering of Cu atoms ...

    Abstract A local electrode atom probe has been employed to trace the onset of Cu clustering followed by their coarsening and subsequent growth upon rapid (10s) annealing of an amorphous Fe73.5Si15.5Cu1Nb3B7 alloy. It has been found that the clustering of Cu atoms introduces heterogeneities in the amorphous matrix, leading to the formation of Fe rich regions which crystallizes pseudo-homogeneously into Fe-Si nanocrystals upon annealing. In this paper, we present the data treatment method that allows for the visualization of these different phases and to understand their morphology while still quantifying them in terms of their size, number density and volume fraction. The crystallite size of Fe-Si nanocrystals as estimated from the atom probe data are found to be in good agreement with other complementary techniques like XRD and TEM, emphasizing the importance of this approach towards accurate structural analysis. In addition, a composition driven data segmentation approach has been attempted to determine and distinguish nanocrystalline regions from the remaining amorphous matrix. Such an analysis introduces the possibility of retrieving crystallographic information from extremely fine (2-4 nm sized) nanocrystalline regions of very low volume fraction (< 5 Vol%) thereby providing crucial in-sights into the chemical heterogeneity induced crystallization process of amorphous materials.
    Language English
    Publishing date 2015-12
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1479043-9
    ISSN 1879-2723 ; 0304-3991
    ISSN (online) 1879-2723
    ISSN 0304-3991
    DOI 10.1016/j.ultramic.2015.04.006
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  4. Article ; Online: Ti

    Karati, Anirudha / Nagini, M / Ghosh, Sanyukta / Shabadi, Rajashekhara / Pradeep, K G / Mallik, Ramesh Chandra / Murty, B S / Varadaraju, U V

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 5331

    Abstract: A new single phase high entropy alloy, ... ...

    Abstract A new single phase high entropy alloy, Ti
    Language English
    Publishing date 2019-03-29
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-41818-6
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  5. Article ; Online: Radioactive isotopes reveal a non sluggish kinetics of grain boundary diffusion in high entropy alloys.

    Vaidya, M / Pradeep, K G / Murty, B S / Wilde, G / Divinski, S V

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 12293

    Abstract: High entropy alloys (HEAs) have emerged as a new class of multicomponent materials, which have potential for high temperature applications. Phase stability and creep deformation, two key selection criteria for high temperature materials, are ... ...

    Abstract High entropy alloys (HEAs) have emerged as a new class of multicomponent materials, which have potential for high temperature applications. Phase stability and creep deformation, two key selection criteria for high temperature materials, are predominantly influenced by the diffusion of constituent elements along the grain boundaries (GBs). For the first time, GB diffusion of Ni in chemically homogeneous CoCrFeNi and CoCrFeMnNi HEAs is measured by radiotracer analysis using the
    Language English
    Publishing date 2017-09-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-12551-9
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  6. Book ; Online: Grain boundary diffusion in CoCrFeMnNi high entropy alloy

    Glienke, Marcel / Vaidya, Mayur / Gururaj, K. / Daum, Lydia / Tas, Bengü / Rogal, Lukasz / Pradeep, K. G. / Divinski, Sergiy V. / Wilde, Gerhard

    kinetic hints towards a phase decomposition

    2020  

    Abstract: Grain boundary self-diffusion of $^{57}$Co, $^{51}$Cr, $^{59}$Fe and $^{54}$Mn in a coarse-grained, single-phase fcc CoCrFeMnNi high entropy alloy is measured in a wide temperature range of 643 to 1273~K in both C- and B-type kinetic regimes after ... ...

    Abstract Grain boundary self-diffusion of $^{57}$Co, $^{51}$Cr, $^{59}$Fe and $^{54}$Mn in a coarse-grained, single-phase fcc CoCrFeMnNi high entropy alloy is measured in a wide temperature range of 643 to 1273~K in both C- and B-type kinetic regimes after Harrison's classification. The results suggest that the product of the pertinent segregation factors, $s$, and the grain boundary width, $\delta$, is about 0.5~nm for all elements at temperatures $T>800$~K. Whereas one short-circuit contribution is observed at higher temperatures above 800~K, the penetration profiles in the C-type kinetic regime (643 -- 703~K) reveal two distinct contributions that hint towards a phase decomposition at a fraction of high-angle grain boundaries at these temperatures. A correlative microscopy combining transmission Kikuchi diffraction and atom probe tomography manifests formation of neighbouring Ni-Mn-rich and Cr-rich precipitates at a segment of high angle grain boundaries. Transmission electron microscopy revealed an increased dislocation density in the vicinity of such interfaces which is suggested to be a reason of the enhanced diffusion rates at low temperatures for such short circuits.

    Comment: 17 pages, 11 figures
    Keywords Condensed Matter - Materials Science
    Subject code 669
    Publishing date 2020-03-23
    Publishing country us
    Document type Book ; Online
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  7. Book ; Online: Tuning phase-stability and short-range order through Al-doping in (CoCrFeMn)100-xAlx high entropy alloys

    Singh, Prashant / Marshal, Amalraj / Smirnov, Andrei V. / Sharma, Aayush / Balasubramanian, Ganesh / Pradeep, K. G. / Johnson, Duane D.

    2018  

    Abstract: For (CoCrFeMn)$_{100-x}$Al$_{x}$ high-entropy alloys, we investigate the phase evolution with increasing Al-content (0 $\le$ x $\le$ 20 at.%). From first-principles theory, the Al-doping drives the alloy structurally from FCC to BCC separated by a narrow ...

    Abstract For (CoCrFeMn)$_{100-x}$Al$_{x}$ high-entropy alloys, we investigate the phase evolution with increasing Al-content (0 $\le$ x $\le$ 20 at.%). From first-principles theory, the Al-doping drives the alloy structurally from FCC to BCC separated by a narrow two-phase region (FCC+BCC), which is well supported by our experiments. We highlight the effect of Al-doping on the formation enthalpy and electronic structure of (CoCrFeMn)$_{100-x}$Al$_{x}$ alloys. As chemical short-range order (SRO) in multicomponent alloys indicates the nascent local order (and entropy changes), as well as expected low-temperature ordering behavior, we use thermodynamic linear-response within density-functional theory to predict SRO and ordering transformation and temperatures inherent in (CoCrFeMn)$_{100-x}$Al$_{x}$. The predictions agree with our present experimental findings, and other reported ones.

    Comment: 27 pages, 9 figures, 1 table
    Keywords Condensed Matter - Materials Science
    Subject code 669
    Publishing date 2018-03-18
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Survival in hanging.

    Pradeep, K G / Kanthaswamy, V

    The American journal of forensic medicine and pathology

    1993  Volume 14, Issue 1, Page(s) 80–81

    Abstract: Although hanging is a popular means for suicides in India, the attempt frequently does not result in death. Of 12 cases of hanging, only one of which was accidental, seen at our institution during 1985-90, all but two victims survived. We present data ... ...

    Abstract Although hanging is a popular means for suicides in India, the attempt frequently does not result in death. Of 12 cases of hanging, only one of which was accidental, seen at our institution during 1985-90, all but two victims survived. We present data indicating that hanging victims can be resuscitated even after prolonged periods of suspension and unconsciousness, and we discuss some of the reasons why asphyxiation by hanging may be delayed when there is no damage to the spinal cord.
    MeSH term(s) Adult ; Aged ; Airway Obstruction/mortality ; Airway Obstruction/physiopathology ; Child ; Female ; Humans ; India/epidemiology ; Male ; Middle Aged ; Suicide ; Survival Analysis
    Language English
    Publishing date 1993-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604537-6
    ISSN 1533-404X ; 0195-7910
    ISSN (online) 1533-404X
    ISSN 0195-7910
    DOI 10.1097/00000433-199303000-00019
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1613: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
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  9. Article: Photochemical reaction sequences of blue light activated flavins: sensory transduction through free radical messengers.

    Laloraya, M M / Pradeep, K G / Laloraya, M

    Biochemistry and molecular biology international

    1994  Volume 33, Issue 3, Page(s) 543–551

    Abstract: Flavin photochemistry involves the production of transient flavin free radicals which in turn sensitize molecular oxygen to generate superoxide. The blue light induced photochemical chain reaction of flavins may be blocked at two different levels by ... ...

    Abstract Flavin photochemistry involves the production of transient flavin free radicals which in turn sensitize molecular oxygen to generate superoxide. The blue light induced photochemical chain reaction of flavins may be blocked at two different levels by photoresponse inhibitors. A protein-bound/lipid-bound flavin located on the biomembrane may take part in the blue-light mediated sensory transduction by 'releasing' a 'free radical messenger' equivalent into the cell interior.
    MeSH term(s) Flavins/radiation effects ; Free Radicals/chemistry ; Light ; Neurons, Afferent/metabolism ; Neurons, Afferent/physiology ; Photochemistry ; Photoreceptor Cells/chemistry ; Photoreceptor Cells/drug effects ; Riboflavin/chemistry ; Signal Transduction/physiology ; Superoxides/chemistry
    Chemical Substances Flavins ; Free Radicals ; Superoxides (11062-77-4) ; Riboflavin (TLM2976OFR)
    Language English
    Publishing date 1994-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 1144589-0
    ISSN 1039-9712 ; 0158-5231
    ISSN 1039-9712 ; 0158-5231
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1611: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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  10. Article: Starvation induced hypothyroidism involves perturbations in thyroid superoxide-SOD system in pigeons.

    Prem, P / Parihar, M S / Malini, L / Pradeep, K G

    Biochemistry and molecular biology international

    1998  Volume 45, Issue 1, Page(s) 73–83

    Abstract: This study investigated the influence of starvation over seven days on avian thyroidal superoxide radical levels and superoxide dismutase activity profiles in the Indian rock pigeon Columba livia intermeida, in relation with iodine metabolism. The serum ... ...

    Abstract This study investigated the influence of starvation over seven days on avian thyroidal superoxide radical levels and superoxide dismutase activity profiles in the Indian rock pigeon Columba livia intermeida, in relation with iodine metabolism. The serum thyroid hormone profile was assayed to correlate the thyroidal redox status with the circulating thyroid hormone levels. The spin-trapping results suggest a role for thyroidal superoxide anion (O2.-) in causing a hypothyroid state in pigeons during long term energy withdrawal. Pigeons starved for 1 day generated superoxide and iodide free radicals in their thyroids, with a significant decrease in SOD activity. Regain of SOD activity in 2nd- and 3rd-day starved birds is marked by complete scavenging of radicals in the thyroid, suggesting the significance of SOD in thyroid glands as a potential antioxidant sink against reactive oxygen species, O2.- Resurgence of O2.- radicals with a parallel decrease in SOD activity in the thyroid gland on 5th- and 7th-day of starvation provides evidence of disruption of homeostasis between pro-oxidant and antioxidant states, leading to oxidative stress in avian thyroid during long-term calorie crisis. Following starvation both thyroid hormones thyroxine (T4) and triiodothyronine (T3) decreased, putting pigeons in a hypothyroid state. We argue that oxidative inactivation of thyroid peroxidase and other thyroid proteins by radical attack during starvation invoked oxidative stress, which could be one of the factors responsible for the hypothyroid state in pigeons.
    MeSH term(s) Animals ; Antioxidants/metabolism ; Columbidae ; Hypothyroidism/blood ; Hypothyroidism/enzymology ; Hypothyroidism/metabolism ; Iodides/blood ; Male ; Oxidative Stress ; Starvation/blood ; Starvation/enzymology ; Starvation/metabolism ; Superoxides/blood ; Superoxides/metabolism ; Thyroid Gland/enzymology ; Thyroid Gland/metabolism ; Thyroxine/blood ; Triiodothyronine/blood
    Chemical Substances Antioxidants ; Iodides ; Triiodothyronine (06LU7C9H1V) ; Superoxides (11062-77-4) ; Thyroxine (Q51BO43MG4)
    Language English
    Publishing date 1998-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1144589-0
    ISSN 1039-9712 ; 0158-5231
    ISSN 1039-9712 ; 0158-5231
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