Characterization of the In Situ‐Formed Oxide Layer at the
The formation of an in situ‐formed oxide layer or oxide whiskers was observed for ceramic filters based on MgO–C 4 Al 2 O 3 –MgO–C 12 and Al 2 O 3 –C 13-15 after immersion in liquid steel. The in situ formation of oxide structures was described qualitatively and by thermodynamic calculations but the influences on the morphology
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Evolution of an alumina-magnesia/self-forming spinel
Other studies reported the addition of synthetic spinel aggregate and fine MgO powder in order to reinforce alumina structure by in-situ spinel formation in the matrix 18-21 . However just few published investigations analyze the inclusion of MgO in high-alumina low cement castables without any synthetic spinel
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In Situ Formation of Bismuth‐Based Perovskite
Sep 16 2020 · In Situ Formation of Bismuth‐Based Perovskite Heterostructures for High‐Performance Cocatalyst‐Free Photocatalytic Hydrogen Evolution Yunqi Tang School of Energy and Environment Department of Materials Science and Engineering City University of Hong Kong Kowloon Tong Hong Kong P. R. China
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In Situ Characterization of Thin Film Growth ScienceDirect
Abstract In situ spectroscopic ellipsometry is a versatile optical measurement technique for characterizing thin films. Ellipsometric measurements commonly determine thin film thickness growth and etch rates optical constants surface and interface quality composition and other related material
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Effect of in situ spinel seeding on synthesis of MgO-rich
May 10 2007 · Abstract. J Mater Sci (2007) 42 7286–7293 DOI 10.1007/s Effect of in situ spinel seeding on synthesis of MgO-rich MgAl O 2 4 composite Deepak Mohapatra Æ Debasish Sarkar Received 19 September 2006 / Accepted 23 January 2007 / Published online 10 May 2007 Springer Science Business Media LLC 2007 Abstract MgO-rich MgAl O spinel was prepared by
Get PriceCharacterization of the In Situ‐Formed Oxide Layer at the
The formation of an in situ‐formed oxide layer or oxide whiskers was observed for ceramic filters based on MgO–C 4 Al 2 O 3 –MgO–C 12 and Al 2 O 3 –C 13-15 after immersion in liquid steel. The in situ formation of oxide structures was described qualitatively and by thermodynamic calculations but the influences on the morphology
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Improving in situ spinel refractory castables using a
Apr 01 2016 · This high strength is caused by three factors (i) formation of a strong ceramic bond between the particles and the formation of adhesive glassy phases which improve the sample strength by creating strong bonds between the particles (ii) in situ formation of spinel a strengthening phase in the texture of material and (iii) formation of
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Understanding the Crystallization of Nanosized Cobalt
Dec 14 2005 · By using combined QEXAFS/XRD (supported by measurements obtained using DSC XRD and IR spectroscopy) we have studied in situ the evolution of nanosized cobalt aluminate spinel (CoAl2O4) particles from cobalt-ion-exchanged zeolite precursors. All of the cobalt-ion-exchanged zeolites were observed to first undergo dehydration followed by amorphization before the CoAl2O4
Get PriceIn Situ Formation of Bismuth‐Based Perovskite
Sep 16 2020 · In Situ Formation of Bismuth‐Based Perovskite Heterostructures for High‐Performance Cocatalyst‐Free Photocatalytic Hydrogen Evolution Yunqi Tang School of Energy and Environment Department of Materials Science and Engineering City University of Hong Kong Kowloon Tong Hong Kong P. R. China
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The influence of in situ spinel formation on
Jan 01 2008 · The influence of in situ spinel formation on microstructure and strength of MgO–C refractories containing reactive alumina is investigated as a function of coking temperature. XRD SEM MOR techniques and rotary slag testing were employed to evaluate the microstructure and properties. The improvement of refractory properties was found to be related to the in situ spinel formation in
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The Postspinel Phase Boundary in Mg2SiO4 Determined by in
The phase boundary between spinel (γ phase) and MgSiO3 perovskite MgO periclase in Mg2SiO4 was determined by in situ x-ray measurements by a combination of the synchrotron radiation source (SPring-8) and a large multianvil high-pressure apparatus. The boundary was determined at temperatures between 1400° to 1800°C demonstrating that the postspinel phase boundary has a negative
Get PriceStructural complexity of layered-spinel composite
The changes that occur to the structure of the spinel component and to the average oxidation state of the manganese ions within the composite structure as lithium is electrochemically removed in a battery have been monitored using these techniques in some cases in situ.
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An In Situ Formed Surface Coating Layer Enabling LiCoO2
Jun 15 2020 · It is discovered that LiCoO 2 reacts with Li 1.5 Al 0.5 Ti 1.5 (PO 4) 3 (LATP) at 700 °C to form exclusively spinel phases in addition to Li 3 PO 4 which are structurally coherent to the layered lattice of LiCoO 2. The heat annealing of the precoated thin layer of LATP enables the formation of a high‐quality surface layer.
Get PriceImproved Li-ion diffusion and stability of a LiNi0.5Mn1
The co-doping with metal cations and incorporation of the Li 7 La 3 Zr 2 O 12 (LLZO) superionic conductor into spinel LiNi 0.5 Mn 1.5 O 4 are achieved in situ through a spray drying method by co-doping with Zr and La elements. Microscopic structural characterizations reveal that the doping of hetero-cations into LiNi 0.5 Mn 1.5 O 4 is effective at reducing the amount of Mn 3 enhancing the
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In Situ Formation of Bismuth‐Based Perovskite
Sep 16 2020 · In Situ Formation of Bismuth‐Based Perovskite Heterostructures for High‐Performance Cocatalyst‐Free Photocatalytic Hydrogen Evolution Yunqi Tang School of Energy and Environment Department of Materials Science and Engineering City University of Hong Kong Kowloon Tong Hong Kong P. R. China
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In Situ Formation of an Oxygen-Evolving Catalyst in
Aug 22 2008 · The utilization of solar energy on a large scale requires its storage. In natural photosynthesis energy from sunlight is used to rearrange the bonds of water to oxygen and hydrogen equivalents. The realization of artificial systems that perform "water splitting" requires catalysts that produce oxygen from water without the need for excessive driving potentials.
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Visualizing non-equilibrium lithiation of spinel oxide via
article osti_ title = Visualizing non-equilibrium lithiation of spinel oxide via in situ transmission electron microscopy author = He Kai and Zhang Sen and Li Jing and Yu Xiqian and Meng Qingping and Zhu Yizhou and Hu Enyuan and Sun Ke and Yun Hongseok and Yang Xiao -Qing and Zhu Yimei and Gan Hong and Mo Yifei and Stach Eric A. and Murray Christopher B. and Su
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In situ Synthesis of Nickel Ferrite Nanoparticle/organic
X-ray diffraction analysis revealed that the crystallinity of spinel particles was dependent upon the hydrolysis conditions of NA-IAA. Nanocrystalline nickel ferrite particles around 10 nm were uniformly dispersed in the organic matrix. The formation of nickel ferrite was confirmed by energy-dispersive x-ray and x-ray photoelectron spectroscopy.
Get PriceThe redox "filter" beneath magmatic orogens and the
The two most important magmatic differentiation series on Earth are the Fe-enriching tholeiitic series which dominates the oceanic crust and island arcs and the Fe-depleting calc-alkaline series which dominates the continental crust and continental arcs. It is well known that calc-alkaline magmas are more oxidized when they erupt and are preferentially found in regions of thick crust but
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Materials Free Full-Text In Situ Spinel Formation in a
The hydration of an equimolar mixture of MgO and Al2O3 nano-powders has been proven to be an effective way to synthesize Mg6Al2CO3(OH)16∙4H2O as a component of a nano-structured matrix and magnesia-alumina spinel precursor for high-performance cement-free corundum-spinel refractory castables. (Mg3)–OH–brucite sites (417 °C) formed initially within the magnesia ndashalumina
Get Price(PDF) In-situ formation or pre-formed spinel addition
Download full-text PDF Read castable refractories have been fabricated with in-situ spinel formation. Spinel formation occurs between 1200 and 1400 °C with a net-like morphology interlinked
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In Situ Studies of Solvothermal Synthesis of Energy Materials
In order to produce tailor‐made materials with specific properties for advanced energy technologies it is essential to obtain an improved understanding of these processes and in this context in situ studies are an important tool as they provide real time information on the reactions taking place.
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Jan 01 2016 · Vol. 101 no. 1 January 2016 Table of Contents. LETTERS. 231. In-situ crystal structure determination of seifertite SiO2 at 129 GPa Studying a minor phase near Earth s core-mantle boundary. Li Zhang Dmitry Popov Yue Meng Junyue Wang Cheng Ji Bing Li and Ho-kwang Mao. Open Access.
Get PriceStructural complexity of layered-spinel composite
The changes that occur to the structure of the spinel component and to the average oxidation state of the manganese ions within the composite structure as lithium is electrochemically removed in a battery have been monitored using these techniques in some cases in situ.
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In situ formation of sintered cordierite–mullite nano
Highlights We succeeded to obtain in situ formed sintered cordierite–mullite nano–macro composites from waste and pure materials at 1400 °C. Their sinterability was greatly dependent on both firing temperature and composition. XRD patterns showed that the optimum temperature required for formation of sintered cordierite–mullite nano–macro composites was achieved at 1400 °C. The batch
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