A kinetic model for two-step phase transformation of hydrothermally treated nanocrystalline anatase

CrystEngComm ◽  
2016 ◽  
Vol 18 (17) ◽  
pp. 3033-3039
Author(s):  
Kairat Sabyrov ◽  
R. Lee Penn
Keyword(s):  
Phase Transformation ◽  
Kinetic Model

scholarly journals Overview of Phase-Change Electrical Probe Memory

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 772 ◽  
Author(s):  
Lei Wang ◽  
Wang Ren ◽  
Jing Wen ◽  
Bangshu Xiong
Keyword(s):  
Phase Transformation ◽  
Kinetic Model ◽  
Phase Change ◽  
State Of The Art ◽  
The State ◽  
Design Rule ◽  
Next Generation ◽  
Future Prospects ◽  
Storage Devices ◽  
Electrical Probe

Phase-change electrical probe memory has recently attained considerable attention owing to its profound potential for next-generation mass and archival storage devices. To encourage more talented researchers to enter this field and thereby advance this technology, this paper first introduces approaches to induce the phase transformation of chalcogenide alloy by probe tip, considered as the root of phase-change electrical probe memory. Subsequently the design rule of an optimized architecture of phase-change electrical probe memory is proposed based on a previously developed electrothermal and phase kinetic model, followed by a summary of the state-of-the-art phase-change electrical probe memory and an outlook for its future prospects.

Phase-Transformation Kinetics of TiO2 in TiO2/(O′+β′)-Sialon Multi-Phase Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 2318-2321
Author(s):  
Jian Yang ◽  
Xiang Xin Xue ◽  
Li Mei Pan ◽  
Mei Wang ◽  
Tai Qiu
Keyword(s):  
Phase Transformation ◽  
Kinetic Model ◽  
Raw Materials ◽  
Transformation Process ◽  
Transformation Kinetic ◽  
Order Kinetic ◽  
Weight Percentage ◽  
Tio2 Anatase ◽  
Additive Content ◽  
Kinetics Of

TiO2/(O′+β′)-Sialon multiphase ceramics with different phase composition of TiO2 were prepared by pressureless sintering under high-purity N2 atmosphere with (O′+β′)-Sialon powder and nano TiO2 (anatase) powder as raw materials, Yb2O3 or Tb2O3 as additive. For each sample, the weight percentage of anatase in TiO2 was calculated from XRD data and the kinetics of anatase-rutile transformation was investigated, wherein the emphasis was placed on the influence of Yb2O3 and Tb2O3. The results indicate that the added Tb2O3 and Yb2O3 serve the significant function of inhibition and promotion on the phase transformation, and the effects are enhanced and attenuated with increasing additive content, respectively. For the sample without additive, the transformation process follows apparent first-order kinetic model. The addition of Yb2O3 or Tb2O3 results in completely different transformation kinetic law. For the samples with Yb2O3 added, the transformation is an apparent second-order reaction, whereas a unique kinetic model, CA=kt1/2+C, is valid for the samples containing Tb2O3. In the two cases, the effect of the additive content on the transformation can be perfectly reflected by the apparent rate constant.

scholarly journals Kinetic Model of ^|^gamma; to ^|^alpha; Phase Transformation at Grain Boundaries in B-Bearing Low Alloy Steel

2012 ◽  
Vol 98 (9) ◽  
pp. 482-490 ◽  
Author(s):  
Suguru Yoshida ◽  
Kohsaku Ushioda ◽  
Yoshio R. Abe ◽  
John ^|^Aring;gren
Keyword(s):  
Phase Transformation ◽  
Kinetic Model ◽  
Grain Boundaries ◽  
Alloy Steel ◽  
Alpha Phase ◽  
Low Alloy Steel

Phase Transformation In Ti-6al-4v Alloys

1972 ◽  
Vol 30 ◽  
pp. 584-585
Author(s):  
Shiro Fujishiro
Keyword(s):  
Phase Transformation ◽  
Grain Boundary ◽  
Cryogenic Temperature ◽  
Β Phase ◽  
Heat Treated ◽  
Mixed Microstructure ◽  
Ductile Behavior

The Ti-6 wt.% Al-4 wt.% V commercial alloys have exhibited an improved formability at cryogenic temperature when the alloys were heat-treated prior to the tests. The author was interested in further investigating this unusual ductile behavior which may be associated with the strain-induced transformation or twinning of the a phase, enhanced at lower temperatures. The starting materials, supplied by RMI Co., Niles, Ohio were rolled mill products in the form of 40 mil sheets. The microstructure of the as-received materials contained mainly ellipsoidal α grains measuring between 1 and 5μ. The β phase formed an undefined grain boundary around the a grains. The specimens were homogenized at 1050°C for one hour, followed by aging at 500°C for two hours, and then quenched in water to produce the α/β mixed microstructure.

Microstructural and Microchemical Characterization of Nickel Sulfide Inclusions in Plate Glass

1991 ◽  
Vol 49 ◽  
pp. 962-963
Author(s):  
J. Cooper ◽  
O. Popoola ◽  
W. M. Kriven
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Glass Matrix ◽  
Nickel Sulfide ◽  
Plate Glass ◽  
Thermal Expansion Mismatch ◽  
Volume Increase ◽  
Β Phase ◽  
Microchemical Characterization

Nickel sulfide inclusions have been implicated in the spontaneous fracture of large windows of tempered plate glass. Two alternative explanations for the fracture-initiating behaviour of these inclusions have been proposed: (1) the volume increase which accompanies the α to β phase transformation in stoichiometric NiS, and (2) the thermal expansion mismatch between the nickel sulfide phases and the glass matrix. The microstructure and microchemistry of the small inclusions (80 to 250 μm spheres), needed to determine the cause of fracture, have not been well characterized hitherto. The aim of this communication is to report a detailed TEM and EDS study of the inclusions.

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