RE dependence of superconductivity in parent T’-RE2CuO4 – implication on the nature of superconductivity

2012 ◽  
Vol 1434 ◽  
Author(s):  
Michio Naito ◽  
Ai Ikeda ◽  
Hideki Yamamoto ◽  
Takaaki Manabe
Keyword(s):  
Transition Temperature ◽  
Boundary Conditions ◽  
Thermodynamic Stability ◽  
Systematic Investigation ◽  
Stringent Control ◽  
Annealing Conditions ◽  
Post Annealing ◽  
Metal Organic ◽  
Ionic Size ◽  
Organic Decomposition

ABSTRACTWe present the results of our systematic investigation of the RE dependency of superconductivity in the parent compounds T’-RE2CuO4 (RE = Pr, Nd, Sm, Eu, Gd, and Tb). Superconducting samples were prepared by metal organic decomposition (MOD). A stringent control of synthesis- and post-annealing-conditions is required to obtain superconducting samples. Superconductivity with a transition temperature (Tconset) ≥ 30 K is achieved for RE = Pr and Nd. By contrast, Tconset is at highest 20 K for RE = Gd. Our results indicate that the induction of superconductivity into T’-RE2CuO4 cuprates strongly depends on the RE3+ ionic size. This trend is discussed from the viewpoint of RE-dependent thermodynamic stability of T’-RE2CuO4. For smaller RE3+ ions, the thermodynamic boundary conditions become tighter.

Effect of Stoichiometry on the Ferroelectric Properties of (Pb1−xLax)TiO3 Thin Films

1998 ◽  
Vol 541 ◽  
Author(s):  
I-Nan Lin ◽  
Cheng-Hsiung Lin ◽  
Yen-Hua Hsu ◽  
Han-Fang Teng ◽  
Hsiu-Fung Cheng
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Leakage Current ◽  
Rapid Thermal Annealing ◽  
Remanent Polarization ◽  
Ferroelectric Properties ◽  
The Other ◽  
Post Annealing ◽  
Metal Organic ◽  
Organic Decomposition

AbstractThe (Pb1−xLax)TiO3, (PLT) thin films possessing good ferroelectric properties were successfully obtained by using metal-organic-decomposition (MOD) process, followed by furnace post-annealing at 600-700°C (60 min) or rapid thermal annealing (RTA) at 600-700°C (60 s). Excess Pb-species incorporated in precursors for compensating for the Pb-loss during MOD process results in pronounced modification on thin film's electrical properties. The leakage current is reduced from JL= 1 × 10−3 A/cm2 to 1 × 10−4 A/cm2 (at 400 kV/cm) and the remanent polarization is increased from Pr= 8.3 µ C/cm2 to 12.6 µC/cm2, when 10 mol% excess-Pb is added. On the other hand, larger La-content in PLT films results in more pronounced Pb-loss and induces larger leakage current, which significantly degrades the ferroelectric properties of the films. The best properties obtained for PLT films prepared by the MOD process are: Pr= 12.6 µC/cm2, Ec = 80 kV/cm and JL= 10−5 A/cm2 (at 400 kV/cm).

Charge Trapping and Degradation Properties of PZT Thin Films for MEMS

1996 ◽  
Vol 444 ◽  
Author(s):  
Hyeon-Seag Kim ◽  
D. L. Polla ◽  
S. A. Campbell
Keyword(s):  
Thin Films ◽  
Loss Factor ◽  
High Field ◽  
Microelectromechanical Systems ◽  
Charge Trapping ◽  
Metal Organic ◽  
Electrical Reliability ◽  
Silicon Based ◽  
Degradation Properties ◽  
Organic Decomposition

AbstractThe electrical reliability properties of PZT (54/46) thin films have been measured for the purpose of integrating this material with silicon-based microelectromechanical systems. Ferroelectric thin films of PZT were prepared by metal organic decomposition. The charge trapping and degradation properties of these thin films were studied through device characteristics such as hysteresis loop, leakage current, fatigue, dielectric constant, capacitancevoltage, and loss factor measurements. Several unique experimental results have been found. Different degradation processes were verified through fatigue (bipolar stress), low and high charge injection (unipolar stress), and high field stressing (unipolar stress).

Metal-Organic Frameworks (MOFs) as Fuels for Advanced Applications: Evaluating and Modifying the Combustion Energy of Popular MOFs

2019 ◽  
Author(s):  
Hatem M. Titi ◽  
Mihails Arhangelskis ◽  
Athanassis Katsenis ◽  
Cristina Mottillo ◽  
Ghada Ayoub ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Energy Content ◽  
Metal Organic Frameworks ◽  
Systematic Investigation ◽  
Combustion Energy ◽  
Metal Organic ◽  
Advanced Applications ◽  
Ligand Replacement

Systematic investigation of combustion energies for popular metal-organic frameworks (MOFs) reveals energy content comparable to conventional energetic materials and can be further modified and dine-tuned by polymorphism and isostructural ligand replacement to yield materials with energy densities comparable to Diesel or kerosene.<br>

Biomimetic Catalysts of Iron–based Metal-Organic Frameworks with High Peroxidase-Mimicking Activity for Colorimetric Biosensing

2021 ◽  
Author(s):  
Xiao-Ning Wang ◽  
Yu-Meng Zhao ◽  
Jialuo Li ◽  
Jiandong Pang ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Systematic Investigation ◽  
Biomimetic Catalysts ◽  
Biomimetic Catalyst ◽  
Metal Organic ◽  
Iron Based ◽  
Colorimetric Biosensing

The field of Metal-Organic Frameworks (MOFs)-based biomimetic catalyst has achieved great progresses, but is still in its infancy stage. The systematic investigation on the tailored construction of MOF-based biomimetic catalysts...

Proposal for a material with negative thermal expansion

2016 ◽  
Vol 30 (32) ◽  
pp. 1650238
Author(s):  
Mikrajuddin Abdullah
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Metal Organic Framework ◽  
Negative Thermal Expansion ◽  
Lennard Jones ◽  
Model Predictions ◽  
Metal Organic ◽  
Organic Framework

I propose a model of a material that exhibits negative thermal expansion (NTE) properties and criteria for the occurrence of linear and volumetric NTE. I derived the criteria for an arbitrary force between rigid units in the material. These criteria are also discussed specifically for the Lennard–Jones (6–12) potential and in more detail for metal–organic framework (MOF) materials comprising rigid units connected by organic linkers. Qualitatively, the model predictions can explain some observed results. Surprisingly, the model can produce equations for the transition temperature from NTE to positive thermal expansion (PTE), [Formula: see text] K, which is exactly the same as the temperature at which the glass transition begins to occur in most polymers, i.e., [Formula: see text] K.

scholarly journals Buckling and vibration analysis of shape memory laminated composite beams under axially heterogeneous in-plane loads in the glass transition temperature region

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Nilesh Tiwari ◽  
A. A. Shaikh
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Boundary Conditions ◽  
Shape Memory ◽  
Transition Region ◽  
Shape Memory Polymer ◽  
Shear Deformation Theory ◽  
Effect Of Temperature ◽  
Glass Transition Region

AbstractBuckling and vibration study of the shape memory polymer composites (SMPC) across the glass transition temperature under heterogeneous loading conditions are presented. Finite element analysis based on C° continuity equation through the higher order shear deformation theory (HSDT) is employed considering non linear Von Karman approach to estimate critical buckling and vibration for the temperature span from 273 to 373 K. Extensive numerical investigations are presented to understand the effect of temperature, boundary conditions, aspect ratio, fiber orientations, laminate stacking and modes of phenomenon on the buckling and vibration behavior of SMPC beam along with the validation and convergence study. Effect of thermal conditions, particularly in the glass transition region of the shape memory polymer, is considerable and presents cohesive relation between dynamic modulus properties with magnitude of critical buckling and vibration. Moreover, it has also been inferred that type of axial loading condition along with the corresponding boundary conditions significantly affect the buckling and vibration load across the glass transition region.

Greatly enhanced flux pinning properties of fluorine-free metal–organic decomposition YBCO films by co-addition of halogens (Cl, Br) and metals (Zr, Sn, Hf)

2018 ◽  
Vol 31 (4) ◽  
pp. 044004 ◽  
Author(s):  
Takanori Motoki ◽  
Shuhei Ikeda ◽  
Shin-ichi Nakamura ◽  
Genki Honda ◽  
Tatsuoki Nagaishi ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Ybco Films ◽  
Metal Organic ◽  
Co Addition ◽  
Pinning Properties ◽  
Free Metal ◽  
Organic Decomposition
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