Abnormal grain growth of rutile TiO2 induced by ZrSiO4

Hanaor, Dorian; Xu, Weixing; Ferry, Michael; Sorrell, Charles C.

doi:10.1016/j.jcrysgro.2012.08.015

Cited by 34 publications

(13 citation statements)

References 68 publications

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“…A theory for the increased compressive strength because of denser struts is that a liquid phase may be formed during the sintering process. Because of a more rapid grain boundary diffusion kinetics and high grain boundary mobility during a liquid phase, the grains are growing much faster and abnormal grain growth is present in the scaffolds with divalent salt [27,28]. As shown in Figure 5 and 6, the faster grain growth of divalent salt scaffolds led to more dense struts and finally to higher compressive strength.…”

Section: Influence Of Ions On Scaffold Propertiesmentioning

confidence: 99%

Coagulated concentrated anatase slurry leads to improved strength of ceramic TiO2 bone scaffolds

Klemm

Tiainen

2018

Ceramics International

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Slurry behaviour has an important influence on the properties of ceramic scaffolds produced by the polymer sponge method. By adding chloride salts to the TiO2 slurry, the viscosity was increased depending on the chloride concentration at low pH and high particle concentration. Slurries with higher viscosity led to closed and dense scaffold struts combined with high porosity, resulting in a compressive strength over 1.6 MPa. Furthermore, scaffold prepared with 0.1 M CaCl2 and SrCl2 showed the formation of Caand Sr-rich phases at the grain boundaries. These ions were also shown to reduce the activation energy for grain growth in the TiO2 scaffold as indicated by the significantly larger grain size. Ca 2+-doped scaffolds had the highest compressive strength, while the strength of Sr 2+-doped scaffolds was reduced by the formation of a solid solution phase below the sintering temperature.

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Section: Influence Of Ions On Scaffold Propertiesmentioning

confidence: 99%

Coagulated concentrated anatase slurry leads to improved strength of ceramic TiO2 bone scaffolds

Klemm

Tiainen

2018

Ceramics International

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“…The best known example is for sapphire, which, in the pure state, is a colorless wide band gap insulator. However, contamination by Ti and Fe increases the light absorption, which generates a blue color, through a single IVCT reaction according to the reaction: …”

Section: Introductionmentioning

confidence: 99%

Multivalence Charge Transfer in Doped and Codoped Photocatalytic TiO₂

et al. 2016

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The present work reports data for the mineralogical and chemical properties of anatase thin films individually doped or codoped with chromium and vanadium, fabricated by sol-gel spin coating on glass substrates and annealing at 450 °C for 2 h. X-ray photoelectron spectroscopy data indicated the presence of Ti(4+), Ti(3+), Cr(3+), and possibly Cr(4+) in the Cr-doped thin films; Ti(4+), Ti(3+), V(3+), V(4+), and possibly V(5+) in the V-doped thin films; and Ti(4+), Ti(3+), Cr(3+), Cr(4+), V(3+), V(4+), and possibly V(5+) in the codoped thin films. While the thermodynamically stable valences Ti(4+), Cr(3+), and V(5+) would be expected to have formed, the presence of the nonequilibrium valences Ti(3+), Cr(4+), V(3+), and V(4+) is considered to have resulted from intervalence charge transfer for the Cr-doped and V-doped systems but from multivalence charge transfer (MVCT) for the codoped system. The latter phenomenon, which is introduced as a new conceptual term, describes the nature of the mutual exchange of electrons during valence changes of both dopant (Cr, V) and matrix (Ti) ions during annealing. In the present case, MVCT appears to be a transient metastable condition that acts during annealing, but subsequent UV irradiation can alter its effects.

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“…[ 5 ] The 1T′‐to‐2H phase transition due to the reduction of Te vacancies can trigger the abnormal grain growth of 2H‐MoTe 2 through the grain boundary (GB) migration. [ 6 ] However, it is still very challenging for designed growth of large‐size MoTe 2 single crystal since it is difficult to precisely control the growth parameters, for example, nucleation density, grain growth rate and feeding rate of the precursor. [ 7 ] As a result, some defects with high density of Te vacancies are hard to be avoided in the CVD‐grown 2H‐MoTe 2 .…”

Section: Introductionmentioning

confidence: 99%

Defect Etching of Phase‐Transition‐Assisted CVD‐Grown 2H‐MoTe₂

Zhou

Tao

Chen

et al. 2021

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2D molybdenum ditelluride (MoTe2) with polymorphism is a promising candidate to developing phase‐change memory, high‐performance transistors and spintronic devices. The phase‐transition‐assisted chemical vapor deposition (CVD) process has been used to prepare large‐scale 2H‐MoTe2 with large grain size and low density of grain boundary. However, because of the lack of precise control of the growth condition, some defects including the amorphous regions and grain boundaries in 2H‐MoTe2 are hardly avoidable. Here, a facile method of selectively etching defects in large‐scale CVD‐grown 2H‐MoTe2 by triiodide ion (I3−) solution is reported. The defect etching is attributed to the reduced lattice symmetry, high chemisorption activity and high conductivity of the defects due to the high density of Te vacancies. The treated 2H‐MoTe2 shows the suppressed hysteresis in the electrical transfer curve, enhances hole mobility and the higher effective barrier height on the metal contact, suggesting the decreased density of defects. Further chemical analysis indicates that the 2H‐MoTe2 is not damaged or doped by I3− solution during the etching process. This simple and low‐cost post‐processing method is effective for etching the defects in large‐area 2H‐MoTe2 for high‐performance device applications.

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Abnormal grain growth of rutile TiO2 induced by ZrSiO4

Cited by 34 publications

References 68 publications

Coagulated concentrated anatase slurry leads to improved strength of ceramic TiO2 bone scaffolds

Coagulated concentrated anatase slurry leads to improved strength of ceramic TiO2 bone scaffolds

Multivalence Charge Transfer in Doped and Codoped Photocatalytic TiO₂

Defect Etching of Phase‐Transition‐Assisted CVD‐Grown 2H‐MoTe₂

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Abnormal grain growth of rutile TiO2 induced by ZrSiO4

Cited by 34 publications

References 68 publications

Coagulated concentrated anatase slurry leads to improved strength of ceramic TiO2 bone scaffolds

Coagulated concentrated anatase slurry leads to improved strength of ceramic TiO2 bone scaffolds

Multivalence Charge Transfer in Doped and Codoped Photocatalytic TiO2

Defect Etching of Phase‐Transition‐Assisted CVD‐Grown 2H‐MoTe2

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Product

Resources

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Multivalence Charge Transfer in Doped and Codoped Photocatalytic TiO₂

Defect Etching of Phase‐Transition‐Assisted CVD‐Grown 2H‐MoTe₂