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Journal articles on the topic 'Novel Crystal Structure - Transition Metal Oxides - Magnetic Properties'

Author: Grafiati

Published: 7 September 2023

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1

Dabić, Predrag, Volker Kahlenberg, Biljana Krüger, et al. "Low-temperature phase transition and magnetic properties of K3YbSi2O7." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 77, no. 4 (2021): 584–93. http://dx.doi.org/10.1107/s2052520621006077.

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The new ambient-temperature hexagonal (space group P63 /mmc) polymorph of tripotassium ytterbium(III) disilicate (β-K3YbSi2O7) has been synthesized by the high-temperature flux method and subsequently structurally characterized. In the course of the temperature-dependent single-crystal diffraction experiments, a phase transformation of β-K3YbSi2O7 to a novel low-temperature orthorhombic phase (β′-K3YbSi2O7, space group Cmcm) has been observed at about 210 K. β-K3YbSi2O7 is isostructural with K3ErSi2O7, whereas β′-K3YbSi2O7 adopts a new type of structure. Both compounds can be built up from a r

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2

Romanenko, A. I., G. E. Chebanova, Tingting Chen, Wenbin Su, and Hongchao Wang. "Review of the thermoelectric properties of layered oxides and chalcogenides." Journal of Physics D: Applied Physics 55, no. 14 (2021): 143001. http://dx.doi.org/10.1088/1361-6463/ac3ce6.

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Abstract The current state of investigation on thermoelectric properties of layered chalcogenides and oxides is considered. The relationship between the quasi-two-dimensionality of electronic transport properties and thermoelectric properties is confirmed. A decrease in the dimension of electron transport from three-dimensional to quasi-two-dimensional in materials with a layered structure increases the thermopower with a slight change in electrical conductivity. The bismuth tellurides, bismuth selenides and its alloys are currently one of the outstanding state of the art bulk thermoelectric m

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3

Chiromawa, Idris Muhammad, Amiruddin Shaari, Razif Razali, Summanuwa Timothy Ahams, and Mikailu Abdullahi. "Ab initio Investigation of the Structure and Electronic Properties of Normal Spinel Fe2SiO4." Malaysian Journal of Fundamental and Applied Sciences 17, no. 2 (2021): 195–201. http://dx.doi.org/10.11113/mjfas.v17n2.2018.

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Transition metal spinel oxides have recently been predicted to create efficient transparent conducting oxides for optoelectronic devices. These compounds can be easily tuned by doping or defect to adapt their electronic or magnetic properties. However, their cation distribution is very complex and band structures are still subject to controversy. We propose a complete density functional theory investigation of fayalite (Fe2SiO4) spinel, using Generalized Gradient Approximation (GGA) and Local Density Approximation (LDA) in order to explain the electronic and structural properties of this mater

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4

Han, J. P., and Y. Q. Guo. "Structure stability and magnetic properties of RIn3−xTx (R = Gd, Pr,T = Co, Fe, Mn)." Powder Diffraction 32, no. 4 (2017): 249–54. http://dx.doi.org/10.1017/s0885715617001142.

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The syntheses and crystal structures and magnetic properties of novel RIn3−xTx (R = Gd，Pr；T = Fe，Co，Mn；x = 0–0.3) intermetallic compounds in rare earth-In-3d transition metal ternary system have been systematically investigated. It reveals that RIn3−xTx crystallizes in cubic AuCu3 type structure with a space group of Pm$\bar 3$m and Z = 1. The 1a and 3c crystal positions are occupied by R and In atoms, respectively. The 3d transition metals substitute partly for In and prefer to occupy the 3c site. The lattice parameters and unit cell volumes decrease with increasing the content of 3d transiti

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Zhang, Qin, Heng Chang Qian, Juan Pei, and Suo Jia Yuan. "Competing Effects of Band Filling and Steric Factors on Magnetic and Transport Properties of Double Perovskite." Advanced Materials Research 490-495 (March 2012): 325–28. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.325.

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Ordered double perovskite oxides (Sr2-3xLa2xBax)FeMoO6 (0≤x≤0.3) have been investigated in this work. X-ray powder diffraction reveals that the crystal structure of the compounds changes from a tetragonal I4/m lattice to a cubic Fm m lattice around x=0.2. Due to the electron doping, the lattice constants increase with x. Owing to the competing contribution of electron doping and steric effect, Curie temperature of the compounds is almost unchanged. The resistivity of the parent compound shows a semiconducting behavior below room temperature, but those of the doped samples exhibit a metal-semic

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6

Baker, Steve, Mervyn Roy, Chris Binns, and Martin Lees. "Controlling Crystal Structure in Embedded Magnetic Nanoparticles." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C961. http://dx.doi.org/10.1107/s205327331409038x.

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"Magnetic nanoparticles and nanocomposite materials have attracted much interest due to their novel magnetic behaviour, and their potential use in a range of applications. One of the main reasons for their novel magnetism, appreciated for some time, is the high proportion of under-coordinated atoms at the surface of nanoparticles. In the case of magnetic transition metals this leads to a narrowing of the 3d bands that are responsible for magnetism in these materials, leading to size-dependent nanoparticle properties. The atomic structure adopted by nanoparticles is also a key factor in determi

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7

Moshkina E. M., Molokeev M. S., Eremin E. V., and Bezmaternykh L. N. "Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- bixbyite." Physics of the Solid State 65, no. 6 (2023): 1009. http://dx.doi.org/10.21883/pss.2023.06.56116.57.

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To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 with the bixbyite structure on the composition, the temperature dependences of the magnetization and ac magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The dc magnetization and ac magnetic susceptibility of Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 bixbyites hav

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8

Latushka, S. I., D. V. Zheludkevich, E. V. Budemko, K. N. Nekludov, M. V. Silibin, and D. V. Karpinsky. "Crystal Structure and Magnetic Properties of Bi1-yBa(Sr)Fe1-yTiyO3 Solid Solutions." Journal of Material Science and Technology Research 10 (August 29, 2023): 82–85. http://dx.doi.org/10.31875/2410-4701.2023.10.08.

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Abstract: Usages of various chemical substitution schemes of the initial multiferroic BiFeO3 can significantly reduce known drawbacks specific for the functional oxides based of iron ions and thus foster a creation of novel magnetoelectric compounds perspective for various technological applications. In the present study the co-doped compounds of the system Bi1-y(Ba1- xSrx)yFe1-yTiyO3 (x = 0.0 – 1.0; y ≤ 0.4) synthesized using sol-gel technique were analyzed focusing on the crystal structure stability and the correlation between the structure and magnetic properties. The concentration driven e

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9

Demazeau, Gérard, Samir F. Matar, and Rainer Pöttgen. "Chemical Bonding in Metallic Rutile-type Oxides TO2 (T = Ru, Rh, Pd, Pt)." Zeitschrift für Naturforschung B 62, no. 7 (2007): 949–54. http://dx.doi.org/10.1515/znb-2007-0712.

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Abstract Synthesis routes to rutile-type oxides with 4d and 5d transition elements are summarized. Trends in electronic structure have been established through an analysis in the framework of density functional theory presenting the band structure, the density of states and the properties of chemical bonding. The metal-oxygen bond is found to play the major role in bonding of the system in the valence band. Throughout the series 4d → 5d (RuO2, RhO2, PdO2 and PtO2) the crystal field analysis of the band structure shows a lowering of eg towards t2g manifolds and a broadening of the overall densi

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10

Yi, Di, Jian Liu, Shang-Lin Hsu, et al. "Atomic-scale control of magnetic anisotropy via novel spin–orbit coupling effect in La2/3Sr1/3MnO3/SrIrO3 superlattices." Proceedings of the National Academy of Sciences 113, no. 23 (2016): 6397–402. http://dx.doi.org/10.1073/pnas.1524689113.

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Magnetic anisotropy (MA) is one of the most important material properties for modern spintronic devices. Conventional manipulation of the intrinsic MA, i.e., magnetocrystalline anisotropy (MCA), typically depends upon crystal symmetry. Extrinsic control over the MA is usually achieved by introducing shape anisotropy or exchange bias from another magnetically ordered material. Here we demonstrate a pathway to manipulate MA of 3d transition-metal oxides (TMOs) by digitally inserting nonmagnetic 5d TMOs with pronounced spin–orbit coupling (SOC). High-quality superlattices comprising ferromagnetic

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Nocerino, Elisabetta, Ola K. Forslund, Chennan Wang, et al. "Magnetic nature of wolframite MgReO₄." Journal of Physics: Conference Series 2462, no. 1 (2023): 012037. http://dx.doi.org/10.1088/1742-6596/2462/1/012037.

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Abstract Rhenium oxides belonging to the family AReO4 where A is a metal cation, exhibit interesting electronic and magnetic properties. In this study we have utilized the muon spin rotation/relaxation (µ +SR) technique to study the magnetic properties of the MgReO4 compound. To the best of our knowledge, this is the first investigation reported on this interesting material, that is stabilized in a wolframite crystal structure using a special high-pressure synthesis technique. Bulk magnetic studies show the onset of an antiferromagnetic (AF) long range order, or a possible singlet spin state a

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12

Krisyuk, Vladislav V., Samara Urkasym Kyzy, Tatyana V. Rybalova, Ilya V. Korolkov, Mariya A. Grebenkina та Alexander N. Lavrov. "Structure and Properties of Heterometallics Based on Lanthanides and Transition Metals with Methoxy-β-Diketonates". Molecules 27, № 23 (2022): 8400. http://dx.doi.org/10.3390/molecules27238400.

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The possibility of obtaining volatile polynuclear heterometallic complexes containing lanthanides and transition metals bound by methoxy-β-diketonates was studied. New compounds were prepared by cocrystallization of monometallic complexes from organic solvents. Ln(tmhd)3 were used as initial monometallic complexes (Ln = La, Pr, Sm, Gd, Tb, Dy, Lu; tmhd = 2,2,6,6-tetramethylheptane-3,5-dionate) in combination with TML2 in various ratios (TM = Cu, Co, Ni, Mn; L: L1 = 1,1,1-trifluoro-5,5-dimethoxypentane-2,4-dionate, L2 = 1,1,1-trifluoro-5,5-dimethoxy-hexane-2,4-dionate, L3 = 1,1,1-trifluoro-5-me

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Struch, Niklas, Gregor Schnakenburg та Arne Lützen. "A novel crystal structure of {tris[4-(1H-pyrazol-3-yl-κN2)-3-azabut-3-enyl]amine-κN}iron(II) bis(tetrafluoridoborate) methanol monosolvate featuring a low-spin configuration". Acta Crystallographica Section C Structural Chemistry 71, № 12 (2015): 1048–52. http://dx.doi.org/10.1107/s2053229615020409.

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Mononuclear complexes are good model systems for evaluating the effects of different ligand systems on the magnetic properties of iron(II) centres. A novel crystal structure of the title compound, [Fe(C18H24N10)](BF4)2·CH3OH, with one molecule of methanol per formula unit exhibits a strictly sixfold coordination sphere associated with a low-spin configuration at the metal centre. The incorporated methanol solvent molecule promotes extended hydrogen-bonding networks between the tetrafluoridoborate anions and the cationic units. A less constrained crystal structure regarding close contacts betwe

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14

Dissanayaka Mudiyanselage, Ranuri S., Tai Kong, and Weiwei Xie. "Crystal growth and physical properties of an antiferromagnetic molecule: trans-dibromidotetrakis(acetonitrile)chromium(III) tribromide, [CrBr2(NCCH3)4](Br3)." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 77, no. 4 (2021): 624–31. http://dx.doi.org/10.1107/s2052520621004662.

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The synthesis, crystal structure determination, magnetic properties and bonding interaction analysis of a novel 3d transition-metal complex, [CrBr2(NCCH3)4](Br3), are reported. Single-crystal X-ray diffraction results show that [CrBr2(NCCH3)4](Br3) crystallizes in space group C2/m (No. 12) with a symmetric tribromide anion and the powder X-ray diffraction results show the high purity of the material specimen. X-ray photoelectron studies with a combination of magnetic measurements demonstrate that Cr adopts the 3+ oxidation state. Based on the Curie–Weiss analysis of magnetic susceptibility dat

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15

Yahsi, Yasemin. "X-ray characterization and magnetic properties of dioxygen-bridged CuIIand MnIIISchiff base complexes." Acta Crystallographica Section C Structural Chemistry 72, no. 7 (2016): 585–92. http://dx.doi.org/10.1107/s2053229616008974.

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The coordination chemistry of multinuclear metal compounds is important because of their relevance to the multi-metal active sites of various metalloproteins and metalloenzymes. Multinuclear CuIIand MnIIIcompounds are of interest due to their various properties in the fields of coordination chemistry, inorganic biochemistry, catalysis, and optical and magnetic materials. Oxygen-bridged binuclear MnIIIcomplexes generally exhibit antiferromagnetic interactions and a few examples of ferromagnetic interactions have also been reported. Binuclear CuIIcomplexes are important due to the fact that they

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16

Suyolcu, Y. E., G. Christiani, P. A. van Aken, and G. Logvenov. "Design of Complex Oxide Interfaces by Oxide Molecular Beam Epitaxy." Journal of Superconductivity and Novel Magnetism 33, no. 1 (2019): 107–20. http://dx.doi.org/10.1007/s10948-019-05285-4.

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Abstract Complex oxides provide a versatile playground for many phenomena and possible applications, for instance, high-temperature superconductivity, magnetism, ferroelectricity, metal-to-insulator transition, colossal magnetoresistance, and piezoelectricity. The origin of these phenomena is the competition between different degrees of freedom such as charge, orbital, and spin, which are interrelated with the crystal structure, the oxygen stoichiometry, and the doping dependence. Recent developments not only in the epitaxial growth technologies, such as reactive molecular beam epitaxy, but al

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Habermeier, Hanns-Ulrich. "Complex Oxide Interfaces: A Path to Design New Materials." MRS Proceedings 1454 (2012): 137–48. http://dx.doi.org/10.1557/opl.2012.924.

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ABSTRACTHeterostructures composed of transition metal oxides with strong electron correlation offer a unique opportunity to design new artificial materials whose electrical, magnetic and optical properties can be manipulated by tailoring the occupation of the d-orbitals of the transition metal in the compound. This possibility is an implication of symmetry constraints at interfaces with the consequence of a reconstruction of the coupled charge-, spin-, and orbital states of the constituents and their interactions. Novel architectures can be constructed showing functions well beyond charge dens

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18

Mondal, S., and A. K. Banthia. "Triethanolamine Molybdate, a New Polymeric Precursor for Molybdenum Nitride." Advanced Materials Research 29-30 (November 2007): 195–98. http://dx.doi.org/10.4028/www.scientific.net/amr.29-30.195.

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Nitrides remain a relatively unexplored class of materials primarily due to the difficulties associated with their synthesis and characterization. Several synthetic routes, including high temperature reactions, microwave assisted synthesis, and the use of plasmas, to prepare binary and ternary nitrides have been explored. Transition metal nitrides form a class of materials with unique physical properties, which give them varied applications, as high temperature ceramics, magnetic materials, superconductors or catalysts. They are commonly prepared by high temperature conventional processes, but

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19

Hamchaoui, Farida, Véronique Alonzo, Diego Venegas-Yazigi, Houria Rebbah, and Eric Le Fur. "Six novel transition-metal phosphite compounds, with structure related to yavapaiite: Crystal structures and magnetic and thermal properties of AI[MIII(HPO3)2] (A=K, NH4, Rb and M=V, Fe)." Journal of Solid State Chemistry 198 (February 2013): 295–302. http://dx.doi.org/10.1016/j.jssc.2012.10.007.

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20

Morozova, Polina A., Stanislav S. Fedotov, and Artem M. Abakumov. "(Digital Presentation) Prussian Blue Analogs – a Wide Variety of Promising Cathode Materials with Peculiar Electrochemical Properties." ECS Meeting Abstracts MA2022-01, no. 1 (2022): 59. http://dx.doi.org/10.1149/ma2022-01159mtgabs.

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Today, post-lithium energy storage technologies are now rapidly progressing due to the high price of a net Li-ion battery, which also depends on the desired capacity and power. Among sodium, potassium, calcium, magnesium, and even aluminum-based alternatives, young potassium-ion batteries demonstrate high capacity and energy density, notable ionic transport in electrolytes, the possibility to employ graphite anodes, and a wide variety of possible electrode materials: layered oxides, polyanionic, organic compounds, Prussian Blue analogs. However, the latter ones are generally considered as the

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Hamchaoui, Farida, Veronique Alonzo, Diego Venegas-Yazigi, Houria Rebbah, and Eric Le Fur. "ChemInform Abstract: Six Novel Transition-Metal Phosphite Compounds, with Structure Related to Yavapaiite: Crystal Structures and Magnetic and Thermal Properties of AI[MIII(HPO3)2] (A: K, NH4, Rb and M: V, Fe)." ChemInform 44, no. 17 (2013): no. http://dx.doi.org/10.1002/chin.201317018.

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Méndez-Arriaga, José M., Itziar Oyarzabal, Álvaro Martín-Montes, Judith García-Rodríguez, Miguel Quirós, and Manuel Sánchez-Moreno. "First Example of Antiparasitic Activity Influenced by Thermochromism: Leishmanicidal Evaluation of 5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine Metal Complexes." Medicinal Chemistry 16, no. 3 (2020): 422–30. http://dx.doi.org/10.2174/1573406415666190401120607.

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Background: The World Health Organization catalogues illnesses such as Leishmaniasis as neglected diseases, due to low investment in new drugs to fight them. The search of novel and non-side effects anti-parasitic compounds is one of the urgent needs for the Third World. The use of triazolopyrimidines and their metallic complexes has demonstrated hopeful results in this field. Objective: This work studies the antiparasitic efficacy of a series of 5,7-dimethyl-1,2,4- triazolo[1,5-a]pyrimidine first row transition metal complexes against three leishmania spp. strains. Methods: The in vitro antip

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Sengupta, Abhinanda, Ajit Kumar, Aakash Ahuja, et al. "Nano-Crystallites of P2-Type Layered Transition Metal Oxide High Voltage Cathode for Sodium-Ion Battery." ECS Meeting Abstracts MA2022-02, no. 64 (2022): 2332. http://dx.doi.org/10.1149/ma2022-02642332mtgabs.

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In this era of transitioning from conventional sources of energy to non-conventional, sodium-ion battery research has been burgeoning as an indigenous solution to energy storage applications, considering the sustainability, cost effectiveness, high availability and a familiar redox chemistry 1. P2-type Na2/3Ni1/3Mn2/3O2 is one of the preeminent cathode for sodium-ion batteries because of their environmental friendliness, open framework, superior specific capacity, higher operating voltage and air-moisture stability. However, rapid capacity decay on charging it to a higher voltage because of P2

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Imamaliyeva, Samira Zakir. "New Thallium Tellurides with Rare Earth Elements." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 22, no. 4 (2020): 460–65. http://dx.doi.org/10.17308/kcmf.2020.22/3117.

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Compounds of the Tl4LnTe3 (Ln-Nd, Sm, Tb, Er, Tm) composition were synthesized by the direct interaction of stoichiometric amounts of thallium telluride Tl2Te elementary rare earth elements (REE) and tellurium in evacuated (10-2 Pa) quartz ampoules. The samples obtained were identified by differential thermal and X-ray phase analyses. Based on the data from the heating thermograms, it was shown that these compounds melt with decomposition by peritectic reactions. Analysis of powder diffraction patterns showed that they were completely indexed in a tetragonal lattice of the Tl5Te3 type (space g

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Norouzi, Nazgol, Darrell Omo-Lamai, Timofey Averianov, Farbod Alimohammadi, and Ekaterina Pomerantseva. "Molybdenum Oxide/Dopamine-Derived Carbon Electrodes with Enhanced Electrochemical Activity in Energy Storage Systems." ECS Meeting Abstracts MA2022-02, no. 2 (2022): 137. http://dx.doi.org/10.1149/ma2022-022137mtgabs.

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Herein, a versatile sol-gel reaction produces new electrode materials consisting of tightly integrated molybdenum oxide and carbon derived from chemically incorporated dopamine molecules, and the materials show enhanced electrochemical activity in nonaqueous Li-ion and aqueous Zn-ion energy storage systems. The novel synthesis entails the oxidation of molybdenum in aqueous solutions of excess and limited dopamine (Dopa) hydrochloride via a hydrogen peroxide-initiated process. The transformation of molybdenum under the condition of Dopa excess (Mo:Dopa molar ratio of 1:1) resulted in the format

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Ye, Xubin, Jianfa Zhao, Hena Das, et al. "Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO3." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-22064-9.

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AbstractPbMO3 (M = 3d transition metals) family shows systematic variations in charge distribution and intriguing physical properties due to its delicate energy balance between Pb 6s and transition metal 3d orbitals. However, the detailed structure and physical properties of PbFeO3 remain unclear. Herein, we reveal that PbFeO3 crystallizes into an unusual 2ap × 6ap × 2ap orthorhombic perovskite super unit cell with space group Cmcm. The distinctive crystal construction and valence distribution of Pb2+0.5Pb4+0.5FeO3 lead to a long range charge ordering of the -A-B-B- type of the layers with two

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Lyubutin, Igor S., Alexander G. Gavriliuk, and Viktor Struzhkin. "Magnetic Collapse and Insulator-Metal Transitions in Some 3D Metal Oxides Under High Pressures." MRS Proceedings 987 (2006). http://dx.doi.org/10.1557/proc-987-0987-pp05-05.

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AbstractIn the systems with strong electron correlations, many theories predict the high-pressure-induced dielectric-metal transition, which is followed by collapse of localized magnetic moment and structural phase transition. In this report, summary results of many last experiments on the influence of high pressure on the magnetic and crystal structure as well on the electronic and transport properties of 3d metal oxides is presented. Along with X-ray diffraction, optical absorption, Raman scattering and electroresistivity measurements, several synchrotron radiation techniques have also been

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Yamaura, Jun-ichi, and Zenji Hiroi. "Crystal structure and magnetic properties of the 5d transition metal oxides AOsO4(A=K,Rb,Cs)." Physical Review B 99, no. 15 (2019). http://dx.doi.org/10.1103/physrevb.99.155113.

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Kumar, Harish, Matthias Köpf, A. Ullrich, M. Klinger, Anton Jesche, and Christine A. Kuntscher. "Fluorite-related iridate Pr3IrO7: Crystal growth, structure, magnetism, thermodynamic, and optical properties." Journal of Physics: Condensed Matter, October 13, 2022. http://dx.doi.org/10.1088/1361-648x/ac9a26.

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Abstract Spin-orbit coupling in heavy 5$d$ metal oxides, in particular, iridates have received tremendous interest in recent years due to the realization of exotic electronic and magnetic phases. Here, we report the synthesis, structural, magnetic, thermodynamic, and optical properties of the ternary iridate Pr$_3$IrO$_7$. Single crystals of Pr$_3$IrO$_7$ have been grown by the KF flux method. Structural analysis shows that Pr$_3$IrO$_7$ crystallizes in an orthorhombic phase with $Cmcm$ symmetry. The electron energy loss spectroscopy study indicates that Pr is in a 3+ valence state, which impl

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Nenoff, Tina M., Nancy B. Jackson, William T. A. Harrison, Steven G. Thoma, and Steven D. Kohler. "Mixed-Metal Templated Phosphate Phases." MRS Proceedings 432 (1996). http://dx.doi.org/10.1557/proc-432-309.

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AbstractIn an effort to direct the structure formation and subsequently the catalytic properties of novel materials, both organic molecules and transition metals have been systematically incorporated into zinc phosphate materials, and various transition metals into zirconium phosphate materials. The resultant phases in the Zn/P experiments are determined not by the organic template, but by the type and stoichiometric amount of metal incorporated and by the organic template's anion. Furthermore, only one of the phases, a Ni/Zn/P, shows any acidic catalytic behavior. Similarly, the transition me

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Lu, Qiyang, Changhee Sohn, Guoxiang Hu, et al. "Metal–insulator transition tuned by oxygen vacancy migration across TiO2/VO2 interface." Scientific Reports 10, no. 1 (2020). http://dx.doi.org/10.1038/s41598-020-75695-1.

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Abstract Oxygen defects are essential building blocks for designing functional oxides with remarkable properties, ranging from electrical and ionic conductivity to magnetism and ferroelectricity. Oxygen defects, despite being spatially localized, can profoundly alter global properties such as the crystal symmetry and electronic structure, thereby enabling emergent phenomena. In this work, we achieved tunable metal–insulator transitions (MIT) in oxide heterostructures by inducing interfacial oxygen vacancy migration. We chose the non-stoichiometric VO2-δ as a model system due to its near room t

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Lee, Sang A., Hoidong Jeong, Sungmin Woo, et al. "Phase transitions via selective elemental vacancy engineering in complex oxide thin films." Scientific Reports 6, no. 1 (2016). http://dx.doi.org/10.1038/srep23649.

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Abstract Defect engineering has brought about a unique level of control for Si-based semiconductors, leading to the optimization of various opto-electronic properties and devices. With regard to perovskite transition metal oxides, O vacancies have been a key ingredient in defect engineering, as they play a central role in determining the crystal field and consequent electronic structure, leading to important electronic and magnetic phase transitions. Therefore, experimental approaches toward understanding the role of defects in complex oxides have been largely limited to controlling O vacancie

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Nallagatla, Venkata Raveendra, Harisankar Sasindra, Hyoung Gyun Kim, et al. "Graphene Quantum Dots as an Oxygen Reservoir for Topotactic Phase Transition‐Based Memristive Devices." Advanced Electronic Materials, August 22, 2023. http://dx.doi.org/10.1002/aelm.202300401.

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AbstractA novel class of transition metal oxides, capable of reversible topotactic phase transition between the oxygen‐deficient brownmillerite and oxygen‐rich perovskite, has emerged as a promising material for memristive and magnetoelectric devices. However, the absence of a local oxygen source in the device structure necessitates an oxygen exchange process between the surrounding atmosphere and the switching layer during operation, which can lead to unreliable device performance. In this study, graphene quantum dots (GQDs) are introduced into a SrFe0.5Co0.5Ox memristive device as an oxygen

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Blanchet, Miles D., Bethany E. Matthews, Steven R. Spurgeon, Steve M. Heald, Tamara Isaacs-Smith, and Ryan B. Comes. "Jahn–Teller-driven phase segregation in MnxCo3−xO4 spinel thin films." Journal of Vacuum Science & Technology A 41, no. 5 (2023). http://dx.doi.org/10.1116/6.0002329.

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Transition metal spinel oxides comprised of earth-abundant Mn and Co have long been explored for their use in catalytic reactions and energy storage. However, understanding functional properties can be challenging due to differences in sample preparation and the ultimate structural properties of the materials. Epitaxial thin film synthesis provides a novel means of producing precisely controlled materials to explore the variations reported in the literature. In this work, MnxCo3−xO4 samples from x = 0 to x = 1.28 were synthesized through molecular beam epitaxy and characterized to develop a ma

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Muneta, Iriya, Takanori Shirokura, Pham Nam Hai, Kuniyuki Kakushima, Kazuo Tsutsui, and Hitoshi Wakabayashi. "Ferromagnetism modulation by ultralow current in a two-dimensional polycrystalline molybdenum disulphide atomic layered structure." Scientific Reports 12, no. 1 (2022). http://dx.doi.org/10.1038/s41598-022-22113-3.

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AbstractLayered materials, such as graphene and transition metal dichalcogenides, are able to obtain new properties and functions through the modification of their crystal arrangements. In particular, ferromagnetism in polycrystalline MoS2 is of great interest because the corresponding nonmagnetic single crystals exhibit spontaneous spin splitting only through the formation of grain boundaries. However, no one has reported direct evidence of this unique phenomenon thus far. Herein, we demonstrate ferromagnetism modulation by an ultralow current density < 103 A/cm2 in 7.5-nm-thick polycrysta

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Takeda, Airi, Hidenori Hiraoka, Kota Nakamura, et al. "Polyol Synthesis of Ni and Fe Co-Incorporated Tungsten Oxide for Highly Efficient and Durable Oxygen Evolution Reaction." Journal of The Electrochemical Society, July 8, 2022. http://dx.doi.org/10.1149/1945-7111/ac7fbe.

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Abstract The development of inexpensive transition metal-based catalysts for water splitting has attracted global attention, which should be accomplished in the simplest and most scalable way feasible. In this study, nickel and iron co-incorporated tungsten oxides (NixFe1-xWO4) were synthesized using a simple polyol method, and the materials achieved a highly efficient and stable oxygen evolution reaction (OER) in an alkaline electrolyte. The product as-synthesized using the polyol method consisted of an undeveloped wolframite structure, which was converted to its complete crystal by heat trea

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