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Articoli di riviste sul tema "KTaO₃"

Autore: Grafiati

Pubblicato: 16 novembre 2024

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1

Wu, Ning, Xue-Jing Zhang e Bang-Gui Liu. "Strain-enhanced giant Rashba spin splitting in ultrathin KTaO3 films for spin-polarized photocurrents". RSC Advances 10, n. 72 (2020): 44088–95. http://dx.doi.org/10.1039/d0ra08745a.

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Strong Rashba effects at semiconductor surfaces and interfaces have attracted attention for exploration and applications. We show with first-principles investigation that applying biaxial stress can cause tunable and giant Rashba effects in ultrathin KTaO₃ (KTO) (001) films.

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2

Bajorowicz, B., J. Reszczyńska, W. Lisowski, T. Klimczuk, M. Winiarski, M. Słoma e A. Zaleska-Medynska. "Perovskite-type KTaO3–reduced graphene oxide hybrid with improved visible light photocatalytic activity". RSC Advances 5, n. 111 (2015): 91315–25. http://dx.doi.org/10.1039/c5ra18124k.

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Novel rGO–KTaO₃ composites with various graphene content were successfully synthesized using a facile solvothermal method which allowed both the reduction of graphene oxide and loading of KTaO₃ nanocubes on the graphene sheets.

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3

Tong, Lei, Jie Sun, Shuting Wang, Youmin Guo, Qiuju Li, Hong Wang e Chunchang Wang. "Normal and abnormal dielectric relaxation behavior in KTaO3 ceramics". RSC Advances 7, n. 80 (2017): 50680–87. http://dx.doi.org/10.1039/c7ra09866a.

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4

Wang, Yaqin, Jianli Cheng, Maziar Behtash, Wu Tang, Jian Luo e Kesong Yang. "First-principles studies of polar perovskite KTaO3 surfaces: structural reconstruction, charge compensation, and stability diagram". Physical Chemistry Chemical Physics 20, n. 27 (2018): 18515–27. http://dx.doi.org/10.1039/c8cp02540a.

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5

Hagiwara, Hidehisa, Ittoku Nozawa, Katsuaki Hayakawa e Tatsumi Ishihara. "Hydrogen production by photocatalytic water splitting of aqueous hydrogen iodide over Pt/alkali metal tantalates". Sustainable Energy & Fuels 3, n. 11 (2019): 3021–28. http://dx.doi.org/10.1039/c9se00355j.

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6

Xu, Shaowen, Fanhao Jia, Shunbo Hu, Athinarayanan Sundaresan, Nikita V. Ter-Oganessian, Alexander P. Pyatakov, Jinrong Cheng, Jincang Zhang, Shixun Cao e Wei Ren§. "Predicting the structural, electronic and magnetic properties of few atomic-layer polar perovskite". Physical Chemistry Chemical Physics 23, n. 9 (2021): 5578–82. http://dx.doi.org/10.1039/d0cp06671k.

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7

Laguta, V. V., M. D. Glinchuk, I. P. Bykov, A. Cremona, P. Galinetto, E. Giulotto, L. Jastrabik e J. Rosa. "Shallow traps in pure KTaO 3 crystals". Radiation Effects and Defects in Solids 157, n. 6-12 (gennaio 2002): 721–27. http://dx.doi.org/10.1080/10420150215786.

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8

Potůček, Z., Z. Bryknar e J. Schulz. "Thermoluminescence of nominally pure KTaO 3 crystals". Radiation Effects and Defects in Solids 157, n. 6-12 (gennaio 2002): 1021–24. http://dx.doi.org/10.1080/10420150215827.

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9

Chen, Jikun, Xinyou Ke, Jiaou Wang, Takeaki Yajima, Haijie Qian e Song Sun. "Dipole-correlated carrier transportation and orbital reconfiguration in strain-distorted SrNbxTi1−xO3/KTaO3". Physical Chemistry Chemical Physics 19, n. 44 (2017): 29913–17. http://dx.doi.org/10.1039/c7cp06495k.

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A distinct transportation characteristic of conduction band splitting is achieved by coupling the carriers with randomly distributed lattice-dipoles for strain-distorted SrNb_xTi_1−xO₃/KTaO₃.

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10

Gupta, Anshu, Ajit Singh, Chandan Bera e Suvankar Chakraverty. "Light-matter interaction of the polar-polar interface LaVO₃-KTaO₃ (111)". Journal of Physics: Conference Series 2518, n. 1 (1 giugno 2023): 012009. http://dx.doi.org/10.1088/1742-6596/2518/1/012009.

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KTaO3 (KTO) has emerged as a potential candidate in the spintronics block showing the emergent phenomena in its bulk form as well as thin films, especially in KTO-based heterostructures and interfaces. In this work, we have grown a thin film of polar Mott insulator LaVO3 (LVO) on polar band insulator KTO (111) using the pulsed laser deposition technique. This interfce shows the insulator-to-metal transition. We have studied the photoelectrical properties by using a blue laser light of wavelength 405 nm for illumination in temperatures ranging from 76 K and 300 K. Under blue light illumination, the interface shows enhancement in conductivity, for both 76 K to 300 K. This system has shown the persistent photoconductivity as well. Further, electrostatic gating has also been applied to tune the charge carrier density and the conductivity is increased by around 23 % under the effect of light and electrostatic gating.

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11

Filipič, C., V. Bobnar, Z. Kutnjak, S. Glinšek, B. Kužnik, B. Malič, M. Kosec e A. Levstik. "Strain-induced ferroelectricity in KTaO 3 thin films". EPL (Europhysics Letters) 96, n. 3 (4 ottobre 2011): 37003. http://dx.doi.org/10.1209/0295-5075/96/37003.

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12

Maiwald, M., e O. F. Schirmer. "O − dynamic Jahn-Teller polarons in KTaO 3". Europhysics Letters (EPL) 64, n. 6 (dicembre 2003): 776–82. http://dx.doi.org/10.1209/epl/i2003-00625-3.

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13

Schwaigert, Tobias, Salva Salmani-Rezaie, Matthew R. Barone, Hanjong Paik, Ethan Ray, Michael D. Williams, David A. Muller, Darrell G. Schlom e Kaveh Ahadi. "Molecular beam epitaxy of KTaO₃". Journal of Vacuum Science & Technology A 41, n. 2 (marzo 2023): 022703. http://dx.doi.org/10.1116/6.0002223.

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Strain-engineering is a powerful means to tune the polar, structural, and electronic instabilities of incipient ferroelectrics. KTaO3 is near a polar instability and shows anisotropic superconductivity in electron-doped samples. Here, we demonstrate growth of high-quality KTaO3 thin films by molecular-beam epitaxy. Tantalum was provided by either a suboxide source emanating a TaO2 flux from Ta2O5 contained in a conventional effusion cell or an electron-beam-heated tantalum source. Excess potassium and a combination of ozone and oxygen (10% O3 + 90% O2) were simultaneously supplied with the TaO2 (or tantalum) molecular beams to grow the KTaO3 films. Laue fringes suggest that the films are smooth with an abrupt film/substrate interface. Cross-sectional scanning transmission electron microscopy does not show any extended defects and confirms that the films have an atomically abrupt interface with the substrate. Atomic force microscopy reveals atomic steps at the surface of the grown films. Reciprocal space mapping demonstrates that the films, when sufficiently thin, are coherently strained to the SrTiO3 (001) and GdScO3 (110) substrates.

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14

Trybuła, Zbigniew, Szymon Łoś, Katarzyna Kaszyńska, Maya D. Glinchuk e Igor P. Bykov. "Low Temperature Dielectric Behavior in Iron Doped KTaO 3". Ferroelectrics 268, n. 1 (gennaio 2002): 423–28. http://dx.doi.org/10.1080/713715969.

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15

Tomar, Ruchi, Neha Wadehra, Shelender Kumar, Ananth Venkatesan, D. D. Sarma, Denis Maryenko e S. Chakraverty. "Defects, conductivity and photoconductivity in Ar+ bombarded KTaO 3". Journal of Applied Physics 126, n. 3 (21 luglio 2019): 035303. http://dx.doi.org/10.1063/1.5099546.

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16

Doussineau, P., S. Ziolkiewicz e U. T. Höchli. "Ultrasonic Investigations of Tunnel States in KTaO 3 :Na". Europhysics Letters (EPL) 9, n. 6 (15 luglio 1989): 591–96. http://dx.doi.org/10.1209/0295-5075/9/6/017.

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17

Prosandeev, S. A., V. S. Vikhnin e S. Kapphan. "Percolation with constraints in the highly polarizable oxide KTaO". European Physical Journal B 15, n. 3 (2000): 469. http://dx.doi.org/10.1007/s100510051148.

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18

Kleemann, W., S. Kütz e D. Rytz. "Cluster Glass and Domain State Properties of KTaO 3 Li". Europhysics Letters (EPL) 4, n. 2 (15 luglio 1987): 239–45. http://dx.doi.org/10.1209/0295-5075/4/2/017.

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19

Reyher, H. J., B. Faust, M. Maiwald e H. Hesse. "ODMR and EPR investigations of Fe centers in KTaO $_3$". Applied Physics B: Lasers and Optics 63, n. 4 (27 settembre 1996): 331–37. http://dx.doi.org/10.1007/s003400050092.

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20

Farhi, E., A. K. Tagantsev, R. Currat, B. Hehlen, E. Courtens e L. A. Boatner. "Low energy phonon spectrum and its parameterization in pure KTaO". European Physical Journal B 15, n. 4 (2000): 615. http://dx.doi.org/10.1007/s100510051164.

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21

Prosandeev, S. A., V. S. Vikhnin e S. Kapphan. "Percolation with constraints in the highly polarizable oxide KTaO :Li". European Physical Journal B 15, n. 3 (maggio 2000): 469–74. http://dx.doi.org/10.1007/pl00011047.

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22

Liu, Changjiang, Xi Yan, Dafei Jin, Yang Ma, Haw-Wen Hsiao, Yulin Lin, Terence M. Bretz-Sullivan et al. "Two-dimensional superconductivity and anisotropic transport at KTaO 3 (111) interfaces". Science 371, n. 6530 (12 febbraio 2021): 716–21. http://dx.doi.org/10.1126/science.aba5511.

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23

Gupta, Anshu, Harsha Silotia, Anamika Kumari, Manish Dumen, Saveena Goyal, Ruchi Tomar, Neha Wadehra, Pushan Ayyub e Suvankar Chakraverty. "KTaO ₃ —The New Kid on the Spintronics Block". Advanced Materials 34, n. 9 (18 gennaio 2022): 2106481. http://dx.doi.org/10.1002/adma.202106481.

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24

Suwanwong, Sanit, Artit Hutem, Supoj Kerdmee e Piyarut Moonsri. "UV Irradiation Effect on the Surface KTaO₃ Crystals". Applied Mechanics and Materials 855 (ottobre 2016): 121–25. http://dx.doi.org/10.4028/www.scientific.net/amm.855.121.

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The perovskite oxides property are wide band-gap semiconductors and are sensitive to visible light but opaque. In this paper, we are interested in the resistance change of insulating KTaO3 crystals could decrease as much as 3-4 orders of magnitudes under exposure to focused sunlight. But, these resistances under ambient pressure changed back quickly after light was off. And the resistance changed in a similar way under exposure to synchrotron light but the increase resistance rate was much slower under vacuum condition.However, the large increase resistance rateby increasing the oxygen pressure. From the ARPES study, the change in resistance occurred due to the oxygen vacancy induced by the exposure to ultraviolet light. These oxygen vacancies induce two-dimensional electron gas at the surface KTaO3. This indicates that the KTaO3 could be used as a light sensing device.

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25

Обозова, Е. Д., П. П. Сырников e В. Г. Залесский. "Неоднородная деформация монокристалла KTaO-=SUB=-3-=/SUB=- вследствие обратного флексоэлектрического эффекта". Физика твердого тела 60, n. 5 (2018): 947. http://dx.doi.org/10.21883/ftt.2018.05.45791.312.

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26

Jie, Xing, Guo Er-Jia, Jin Kui-Juan, Lu Hui-Bin, He Meng, Wen Juan e Yang Fang. "Ultraviolet Sensitive Ultrafast Photovoltaic Effect in Tilted KTaO 3 Single Crystals". Chinese Physics Letters 27, n. 2 (febbraio 2010): 027202. http://dx.doi.org/10.1088/0256-307x/27/2/027202.

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27

Bhattacharya, Sanchari, Soumyasree Jena e Sanjoy Datta. "Emergent Phenomena in KTaO₃/SrTiO₃ Heterostructure". Journal of Physics: Conference Series 2518, n. 1 (1 giugno 2023): 012019. http://dx.doi.org/10.1088/1742-6596/2518/1/012019.

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Abstract KTaO3 has become a new material of attraction for exploring various exotic properties at its surface and interfaces. To explore the substrate effect of KTaO3, we have studied a new heterostructure made by KTaO3 and SrTiO3. KTaO3 is a 5d polar perovskite with the complementary planes of KO− and TaO 2 + , whereas SrTiO3 is a 3d non-polar perovskite with alternative stacking SrO0 and TiO 2 0 . By taking the epitaxial layers of SrTiO3 on top of KTaO3, we have created two different interfaces along (0 0 1), which are KO − / TiO 2 0 and TaO 2 + / SrO 0 . We have studied these two interfaces by using density functional theory. In KO − / TiO 2 0 interface, the signature of two-dimensional hole gas (2DHG) has been found. Though the interface turns to insulator when epitaxial layers reach beyond 4.5 u.c. The other one, i.e., TaO 2 + / SrO 0 interface, shows the typical behaviour of two-dimensional electron gas (2DEG), only at the epitaxial layer 2.5 uc. The presence of both types of carriers in a single system for different kinds of interfaces has great use in various device applications.

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28

Tsukada, Shinya, e Yukikuni Akishige. "Thickness Dependence of Extrinsic Dielectric Response in Reduced Ni-Doped KTaO$_{3}$". Japanese Journal of Applied Physics 51 (20 settembre 2012): 09LC01. http://dx.doi.org/10.1143/jjap.51.09lc01.

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29

Zhen-Ye, Zhu, Wang Si-Qi e Fu Yan-Ming. "First-Principles Study of Properties of Strained PbTiO 3 /KTaO 3 Superlattice". Chinese Physics Letters 33, n. 2 (febbraio 2016): 026302. http://dx.doi.org/10.1088/0256-307x/33/2/026302.

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30

Goh, Gregory K. L., Kelvin Y. S. Chan, Barnabas S. K. Tan, Y. W. Zhang, J. H. Kim e Thomas Osipowicz. "Low-Temperature Epitaxy of KTaO[sub 3] and KNbO[sub 3] Films". Journal of The Electrochemical Society 155, n. 1 (2008): D52. http://dx.doi.org/10.1149/1.2801862.

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31

Wu, Bin, Jinzhen Cai e Xin Zhou. "Structural, electronic, optical and photocatalytic properties of KTaO₃ with NiO cocatalyst modification". RSC Advances 12, n. 50 (2022): 32270–79. http://dx.doi.org/10.1039/d2ra06425a.

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Density functional theory calculations reveal that NiO serves as an oxidation cocatalyst to form type-II band alignment with KTaO3, which suppresses the recombination of photoinduced carriers and enhances the photocatalytic activity of KTaO3.

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32

Wang, Fu-Ning, Ji-Chao Li, Yi Li, Xin-Miao Zhang, Xue-Jin Wang, Yu-Fei Chen, Jian Liu, Chun-Lei Wang, Ming-Lei Zhao e Liang-Mo Mei. "Prediction of high-mobility two-dimensional electron gas at KTaO 3 -based heterointerfaces". Chinese Physics B 28, n. 4 (aprile 2019): 047101. http://dx.doi.org/10.1088/1674-1056/28/4/047101.

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33

Paulauskas, I. E., J. E. Katz, G. E. Jellison, N. S. Lewis, L. A. Boatner e G. M. Brown. "Growth, Characterization, and Electrochemical Properties of Doped n-Type KTaO[sub 3] Photoanodes". Journal of The Electrochemical Society 156, n. 5 (2009): B580. http://dx.doi.org/10.1149/1.3089281.

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34

Maglione, M., S. Rod e U. T. Höchli. "Order and Disorder in SrTiO 3 and in Pure and Doped KTaO 3". Europhysics Letters (EPL) 4, n. 5 (1 settembre 1987): 631–36. http://dx.doi.org/10.1209/0295-5075/4/5/019.

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35

Norton, D. P., N. A. Theodoropoulou, A. F. Hebard, J. D. Budai, L. A. Boatner, S. J. Pearton e R. G. Wilson. "Properties of Mn-Implanted BaTiO[sub 3], SrTiO[sub 3], and KTaO[sub 3]". Electrochemical and Solid-State Letters 6, n. 2 (2003): G19. http://dx.doi.org/10.1149/1.1531871.

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36

Bruno, Flavio Y., Siobhan McKeown Walker, Sara Riccò, Alberto la Torre, Zhiming Wang, Anna Tamai, Timur K. Kim, Moritz Hoesch, Mohammad S. Bahramy e Felix Baumberger. "Band Structure and Spin–Orbital Texture of the (111)‐KTaO 3 2D Electron Gas". Advanced Electronic Materials 5, n. 5 (13 marzo 2019): 1800860. http://dx.doi.org/10.1002/aelm.201800860.

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37

Jacobs, Dakota C., Rebecca E. Veitch e Patrick E. Chappell. "Evaluation of Immortalized AVPV- and Arcuate-Specific Neuronal Kisspeptin Cell Lines to Elucidate Potential Mechanisms of Estrogen Responsiveness and Temporal Gene Expression in Females". Endocrinology 157, n. 9 (7 luglio 2016): 3410–19. http://dx.doi.org/10.1210/en.2016-1294.

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In females, ovarian estradiol modulates kisspeptin (Kiss-1) synthesis to act as an obligatory regulator of downstream gonadotropin release in vivo, via stimulation of GnRH neurons. Changes in the ovarian condition are relayed to the neuroendocrine hypothalamus via two sexually dimorphic Kiss-1 populations, located in the anteroventral periventricular (AVPV) and arcuate nuclei, conveying estradiol-positive and -negative feedback, respectively. To elucidate how differential responsiveness to estradiol is mediated in these populations, we generated two kisspeptin-secreting cell lines from an adult kiss1-green fluorescent protein (GFP) female mouse. These lines recapitulate in vivo responsiveness to estradiol, with KTaV-3 (AVPV) cells demonstrating significantly increased kiss1 expression under high physiological estradiol exposure, whereas KTaR-1 (arcuate) cells exhibit kiss1 suppression after lower estradiol exposure. Baseline expression of estrogen receptor-α (esr1) differs significantly between KTaV-3 and KTaR-1 cells, with KTaR-1 cells demonstrating higher basal expression of esr1. Estradiol stimulation of kiss1 expression in KTaV-3 cells is modulated in a dose-dependent manner up to 25.0 pM, with less responsiveness observed at higher doses (>50.0 pM). In contrast, KTaR-1 kiss1 attenuates at lower estradiol doses (2.0–5.0 pM), returning to baseline levels at 25.0 pM and greater. Furthermore, the expression of the core clock genes bmal1 and per2 show normal rhythms in KTaV-3 cells, regardless of estradiol treatment. Conversely, KTaR-1 antiphasic transcription of bmal1 and per2 is phase delayed by low estradiol treatment. Strikingly, estradiol induces circadian rhythms of kiss1 expression only in KTaV-3 cells. Further exploration into estradiol responsiveness will reveal mechanisms responsible for the differential expression pattern demonstrated in vivo between these cell types.

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38

Гусева, Ольга Сергеевна, Ольга Витальевна Малышкина e Артем Сергеевич Митченко. "EFFECT OF MODIFIERS ON THE BARIUM NIOBATE-CALCIUM CERAMICS STRUCTURE". Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials, n. 14 (15 dicembre 2022): 572–82. http://dx.doi.org/10.26456/pcascnn/2022.14.572.

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В работе методом твердофазного синтеза получены образцы керамики состава CaBaNbO чистого и с модифицирующими добавками (5%) SrTiO, KTaO или LiTaO. У всех исследуемых составов керамик выявлено наличие крупных и мелких зерен. Показано, что вхождение LiTaO в состав керамики CaBaNbO на порядок уменьшает размер зерен, а вхождение SrTiO приводит к удлинению формы зерна. На основе анализа элементного состава установлено, что введение модификаторов в состав CaBaNbOуменьшает избыток кислорода в структуре тетрагональной вольфрамовой бронзы, по сравнению с немодифицированной керамикой CaBaNbO. Максимум на температурной зависимости диэлектрической проницаемости практически не зависит от типа модификатора и лежит в интервале 279-285°С. Это на 60 градусов выше температуры Кюри монокристалла CaBaNbO. Независимо от температуры измерения, максимальное значение диэлектрической проницаемости имеет материал CaBaNbOO + 5%SrTiO. Тогда как минимальное значение диэлектрической проницаемости при комнатной температуре имеет образец CaBaNbO + 5%LiTaO, а в точке Кюри - образец CaBaNbO. In this work, the ceramic samples CaBaNbO pure and with modifying additives (5%) SrTiO, KTaO or LiTaO were obtained by solid-phase synthesis. All studied compositions of ceramics revealed the presence of large and small grains. It is shown that the addition of LiTa0 to the composition of CaBaNbO ceramics reduces the grain size by an order of magnitude, while the addition of SrTi0 leads to an elongation of the grain shape. Based on the analysis of the elemental composition, it was found that the introduction of modifiers into the composition of CaBaNbO reduces the excess of oxygen in the structure of tetragonal tungsten bronze, compared to unmodified CaBaNbO ceramics. The maximum on the temperature dependence of the permittivity is practically independent of the type of modifier and is located in the range of 279-285°C. This is 60 degrees higher than the Curie temperature of the CaBaNbO single crystal. Regardless of the measurement temperature, CaBaNbO + 5%SrTiO material has the maximum value of the permittivity. Whereas the minimum value of the permittivity at room temperature has the CaBaNbO + 5%LiTa0 sample, and at the Curie point, the CaBaNbO sample.

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Lee, J. S., Z. G. Khim, Y. D. Park, D. P. Norton, J. D. Budai, L. A. Boatner, S. J. Pearton e R. G. Wilson. "Effects of Co Implantation in BaTiO[sub 3], SrTiO[sub 3], and KTaO[sub 3]". Electrochemical and Solid-State Letters 6, n. 4 (2003): J1. http://dx.doi.org/10.1149/1.1558353.

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Chappell, Patrick, Jessica Ewton, Teagan James, Varsha Karthikeyan e Alia Starman. "PMON54 Exosomes Isolated from Conditioned Media of Immortalized Kisspeptin Neurons Exert Diverse Effects on Central and Peripheral in Vitro Cell Models." Journal of the Endocrine Society 6, Supplement_1 (1 novembre 2022): A555—A556. http://dx.doi.org/10.1210/jendso/bvac150.1154.

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Abstract Previous work in our laboratory explored the proteomic contents of exosome-like extracellular vesicles (EVs) released into the media in vitro from immortalized Kisspeptin (KP) neuronal cell lines KTaV-3 (derived from female mouse AVPV) and KTaR-1 (derived from KNDy neurons in the ARC). EVs were isolated from conditioned media via ultracentrifugation or filtration kit and validated using a NanoCyte, and LCMS-MS analysis revealed that relative abundance of exosomal cargo varied dependent upon estrogen (E2) exposure in vitro, with ∼150-170 proteins up-regulated and ∼200-220 proteins downregulated by E2 in EVs of KTaR-1 and KTaV-3 KP neurons. Since E2-regulated KP exosomal proteins included candidates implicated in the regulation of synaptic plasticity and signaling (i.e. annexins, semaphorins, connexins), we investigated the effects of exposure to purified EVs on gene expression in immortalized GnRH neurons (GT1-7 cells). Notably, EVs from 24h E2-treated KTaV-3 neurons induced increased expression of kiss1r in GT1-7 cells, in contrast to KTaV-3 neurons not exposed to E2, suggesting that AVPV KP neurons may signal an increase in KP receptivity in GnRH neurons in vivo via non-neuronal communication. Additionally, increases in expression of the synaptic scaffolding protein PSD-95 (dlg4) were seen in GT1-7 cells treated with E2-treated KTaV-3 EVs, suggesting AVPV KP neurons may use extracellular vesicles to modulate GnRH neuronal synaptic plasticity over the estrous cycle. While EVs isolated from KTaR-1 conditioned media did not alter GT1-7 kiss1r or dlg4 levels, treatment (24h) resulted in induction of selective gap junction hemichannel expression in GT1-7 cells. KTaR-1 (but not KTaV-3) EVs increased expression of Cx26 (gjb2) irrespective of E2 exposure, while induction of Cx43 (gja1) expression in GT1-7 cells was only observed following treatment with E2-deprived KTaR-1 EVs. Further, we found that KTaR-1 media and EVs can affect osteoblast function in vitro, including increases in sp7 and runx2 expression, E2-dependent modulation of wnt10b, and formation of bone matrix (evaluated by Alizarin Red assay) in cultured osteoblast lines, supporting recent studies implicating ARC KP neurons in bone remodeling. Lastly, we found significant levels of immunomodulatory pentraxins (PTX3) in KP EVs, with abundance dependent upon prior E2 exposure in KTaR-1 KP neurons, as revealed by ELISA. Together, results from these studies suggest that EVs may represent additional intercellular communication pathways utilized by Kiss-1 neurons to elicit changes in nearby neuronal populations and potentially even in the periphery, affecting inflammation and bone remodeling. Future studies will address mechanisms involved in the E2 regulation of exosomal cargo in these critical neuronal populations. Presentation: Monday, June 13, 2022 12:30 p.m. - 2:30 p.m.

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DAS, NABYENDU. "EFFECTS OF STRAIN COUPLING AND MARGINAL DIMENSIONALITY IN THE NATURE OF PHASE TRANSITION IN QUANTUM PARAELECTRICS". International Journal of Modern Physics B 27, n. 08 (15 marzo 2013): 1350028. http://dx.doi.org/10.1142/s0217979213500288.

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Here a recently observed weak first order transition in doped SrTiO 3 [Taniguchi, Itoh and Yagi, Phys. Rev. Lett.99, 017602 (2007)] is argued to be a consequence of the coupling between strain and order parameter fluctuations. Starting with a semi-microscopic action, and using renormalization group equations for vertices, we write the free energy of such a system. This fluctuation renormalized free energy is then used to discuss the possibility of first order transition at zero temperature as well as at finite temperature. An asymptotic analysis predicts small but a finite discontinuity in the order parameter near a mean field quantum critical point at zero temperature. In case of finite temperature transition, near quantum critical point such a possibility is found to be extremely weak. Results are in accord with some experimental findings on quantum paraelectrics such as SrTiO 3 and KTaO 3.

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Vikhnin, V. S., A. G. Badalyan e P. G. Baranov. "Model of Copper Centres in KTaO 3 : Charge Transfer, Charge Compensation, and Propagation of Superhyperfine Field". Ferroelectrics 283, n. 1 (gennaio 2003): 149–65. http://dx.doi.org/10.1080/00150190390204222.

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Ivanov, S. A., V. V. Zhurov, G. Hermeler e Wulf Depmeier. "Structural Phase Transitions in KTaO₃:Li Crystals: Evidence from X-Ray Powder Diffraction Data". Materials Science Forum 228-231 (luglio 1996): 633–38. http://dx.doi.org/10.4028/www.scientific.net/msf.228-231.633.

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Arakcheeva, Alla, Gervais Chapuis, Vladimir Grinevitch e Vladimir Shamray. "A novel perovskite-like Ta-bronze KTa1+z O3: preparation, stoichiometry, conductivity and crystal structure studies". Acta Crystallographica Section B Structural Science 57, n. 2 (1 aprile 2001): 157–62. http://dx.doi.org/10.1107/s0108768100018917.

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A new cubic Ta-bronze (1) KTa_{1+z}^{+(5 -\delta)}O3 [z ≃ 0.107 (3)] was obtained on a cathode by molten salt electrolysis of the system K2TaOF5–K3TaO2F4–(KF + NaF + LiF)eutectic. Black, metallic cubic crystals of (1) are formed together with tetragonal β-Ta. The perovskite-like crystal structure of (1) [a = 4.005 (1) Å, space group Pm\bar3m] was refined with anharmonic displacement parameters for Ta and K atoms and anisotropic displacement parameters for a split O-atom position [KM4CCD diffractometer; λ(Mo Kα); 3320 measured reflections with I > 3σ(I); R = 0.0095, wR = 0.0065, Δρmin = −0.91 e Å−3, Δρmax = 0.65 e Å−3]. Defects in the O and K atomic positions were found. (1) is a semiconductor in the temperature range 4–300 K, whereas the well studied and closely related colourless transparent crystals KTa+5O3 (2) are dielectric. Differences in the properties of (1) and (2) are assumed to be connected with the existence of Ta dumb-bells statistically distributed into the KTaO3 matrix.

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Bicknell, Ann, Jan Francis‐Smythe e Jane Arthur. "Knowledge transfer: de‐constructing the entrepreneurial academic". International Journal of Entrepreneurial Behavior & Research 16, n. 6 (28 settembre 2010): 485–501. http://dx.doi.org/10.1108/13552551011082461.

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PurposeThe purpose of this paper is to illuminate motivations and “pull” factors of academics engaging in knowledge transfer (KT).Design/methodology/approachIn total, 15 in‐depth interviews were conducted with experienced, KT active (KTAs) academics to reveal their motivations and pull factors for engaging. Data were transcribed and submitted to template analysis to achieve qualitative conceptual “saturation”, from which a conjuctural analysis of conceptual relations was derived.FindingsFrom the data, seven thematic areas were inducted: values‐in‐practice, motivations and “buzz moments”, purposive activities, the academic context, the journey of the KTA, pedagogy and perceptions of risk.Research limitations/implicationsThe interview sample (12 males, three females) of active KTAs can be seen as a representative and authentic regional sample from the Midlands – who had carried out both teaching, research and KT aspects within their academic roles. In total, 120,000 words of dialogue were candidly reported, attesting to conceptual coherence.Practical implicationsThe results concur with some existing literature on conceptualising the KTA as an academic intrapreneur, but also highlight aspects of how this role conceptually differs from non‐KTA academics. This has implications for the recruitment, development and retention of KTAs, in addition to facilitating their roles in higher education institutions (HEIs).Originality/valueThis paper constitutes a unique induction of a conceptual model for a relatively new economic and operational phenomenon in HEIs: the KTA. The paper contrasts with existing literature on the barriers and challenges to KTA work by emphasis on the positive and motivational aspects of the role.

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Chang, Sheng Ding, Mu Wei Ji, Chang Xu Yan, Bo Li e Jin Wang. "Photoelectric Response Difference between KTaO₃/ Au and K₂Ta₂O₆/Au Nanocrystals Resulting from Potassium Tantalate Structure". Key Engineering Materials 814 (luglio 2019): 83–89. http://dx.doi.org/10.4028/www.scientific.net/kem.814.83.

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Potassium tantalates is one kind of important semiconductor with potential applications on photoelectric transformation and photocatalysis. Herein, Au nanoparticles were grown on the surface of two kinds of potassium tantalates, KTaO3 nanocubes and K2Ta2O6 nanooctahedron, by flexible reducing HAuCl4, and KTaO3/Au and K2Ta2O6/Au hetero-nanostructures were formed. Although the Au nanoparticles loading enhances the light absorption, KTaO3/Au and K2Ta2O6/Au hetero-nanostructures exhibit different photoelectric properties. The difference of photoelectric properties of two kinds of potassium tantalates/Au hetero-structures hint the photoelectric-property enhancement depends on multiple factors.

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Трепаков, В. А., А. П. Скворцов, Z. Potuvcek, L. Jastrabik e A. Dejneka. "Температурный сдвиг бесфононных f-f-линий люминесценции Er-=SUP=-3+-=/SUP=- в квантовом параэлектрике KTaO-=SUB=-3-=/SUB=-". Физика твердого тела 62, n. 5 (2020): 800. http://dx.doi.org/10.21883/ftt.2020.05.49252.663.

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Abstract In KTaO_3:Er crystals, we observed a temperature shift, unusual for rare earth impurities, for narrow zero-phonon luminescence lines, due to the ^4 S _3/2 → ^4 I _13/2, ^4 F _9/2 → ^4 I _15/2, and ^4 S _3/2 → ^4 I _15/2 transitions in Er^3+ impurity ions. The magnitude of the shifts turned out to be comparable with the large shifts of the R lines of the Cr^3+ luminescence in SrTiO_3:Cr and KTaO_3:Cr crystals, that is, substantially larger than that for the three-charged rare earth ions usually observed in the f – f luminescence spectra in ionic crystals.

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Goyal, Saveena, Neha Wadehra e Suvankar Chakraverty. "Tuning the Electrical State of 2DEG at LaVO 3 −KTaO 3 Interface: Effect of Light and Electrostatic Gate". Advanced Materials Interfaces 7, n. 16 (17 giugno 2020): 2000646. http://dx.doi.org/10.1002/admi.202000646.

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Trepakov, V. A., A. P. Skvortsov, Z. Potucek, Z. Bryknar, D. Nuzhnyy, V. Laguta, V. G. Kuznetsov, A. A. Gavrikov e A. Dejneka. "Optical spectroscopy and unusual temperature shift of f – f zero-phonon luminescence lines: KTaO₃:Er". Ferroelectrics 591, n. 1 (26 aprile 2022): 191–200. http://dx.doi.org/10.1080/00150193.2022.2041938.

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Basun, S. A., V. E. Bursian, H. Hesse, S. Kapphan, L. S. Sochava e V. S. Vikhnin. "Polarization Sensitive Photo Recharging and Optical Alignment of the Tetragonal Fe³⁺ Centers in KTaO₃". Materials Science Forum 239-241 (gennaio 1997): 345–48. http://dx.doi.org/10.4028/www.scientific.net/msf.239-241.345.

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