The effect of solute segregation to deformation twin boundaries on the electrical resistivity of a single-phase superalloy

2020 ◽  
Vol 186 ◽  
pp. 208-212
Author(s):  
Stoichko Antonov ◽  
Bernard Li ◽  
Baptiste Gault ◽  
Qing Tan
Keyword(s):  
Electrical Resistivity ◽  
Single Phase ◽  
Deformation Twin ◽  
Solute Segregation ◽  
Twin Boundaries

Microstructure and Thermoelectric Properties of Na0.5CoO2

2013 ◽  
Vol 802 ◽  
pp. 218-222 ◽  
Author(s):  
Wanatchaporn Namhongsa ◽  
Tosawat Seetawan ◽  
Pennapa Muthitamongkol ◽  
Chanchana Thanachayanont
Keyword(s):  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
Powder Size ◽  
Sodium Ions ◽  
Small Particle Size ◽  
Orthorhombic Structure ◽  
Sodium Cobalt Oxide ◽  
Sintering Method

The polycrystalline of sodium cobalt oxide (Na0.5CoO2) was synthesized by solid state reaction method and sintering method. The microstructure was composed of powder size and crystal structure. The Seebeck coefficient and electrical resistivity are measured. We found that the concentration of sodium ions sandwiched between two neighboring CoO2layers played a crucial role in transport properties. The results showed small particle size, single phase and orthorhombic structure. The Seebeck coefficient of Na0.5CoO2increased as the temperature increased. The electrical resistivity was decreased as temperature decreased from the range 300-500 K.

DC Electrical Resistivity and Magnetic Property of Single-Phase α-Fe2O3Nanopowder Synthesized by a Simple Chemical Method

2009 ◽  
Vol 92 (10) ◽  
pp. 2425-2428 ◽  
Author(s):  
Prita Pant Sarangi ◽  
Sampat Raj Vadera ◽  
Manoj Kumar Patra ◽  
Chandra Prakash ◽  
Narendra Nath Ghosh
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Property ◽  
Chemical Method ◽  
Single Phase ◽  
Dc Electrical Resistivity ◽  
Simple Chemical

scholarly journals Mechanical and Electrical Characteristics of WB2 Synthesized at High Pressure and High Temperature

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1212 ◽  
Author(s):  
Changchun Wang ◽  
Lele Song ◽  
Yupeng Xie
Keyword(s):  
Grain Size ◽  
High Pressure ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Vickers Hardness ◽  
Single Phase ◽  
Hard Material ◽  
Experimental Conditions ◽  
Boundary Density ◽  
Grain Sizes

Single-phase tungsten diboride (WB2) was synthesized at high pressure and high temperature. The different grain sizes ranging from 300 nm to 3 µm were successfully obtained in WB2 by controlling the experimental conditions. The effects of grain size on hardness and resistivity properties were investigated. The Vickers hardness of WB2 was modulated with grain size. The maximum asymptotic Vickers hardness is 25.5 GPa for WB2 with a grain size of 300 nm which is a 10% increase compared to WB2 with a grain size of 3 µm. The optimal electrical resistivity of WB2 was 10−7 Ωm with the biggest grain size of 3 µm, which is ascribed to low grain boundary density. The superior properties of hardness and electrical resistivity demonstrate that WB2 should be a new functional hard material replacing WC which is widely used in industrial production.

Twin Boundaries and Stacking Faults in Monazite (Monoclinic LaPO4)

2004 ◽  
Vol 819 ◽  
Author(s):  
Randall S. Hay
Keyword(s):  
Room Temperature ◽  
Deformation Twin ◽  
Stacking Faults ◽  
Temperature Deformation ◽  
Formation Mechanisms ◽  
Twin Boundaries ◽  
Partial Dislocations ◽  
Transmission Electron ◽  
Fault Migration ◽  
Lattice Formation

AbstractMonazite (LaPO4) was indented at room temperature. Deformation twin boundaries and stacking faults were characterized by high resolution transmission electron microscopy. Kinked deformation twins were also characterized and analyzed. Three types of stacking faults associated with climb-dissociated partial dislocations were observed. Two were found on twin boundaries, and a third in the lattice. Formation mechanisms are discussed. The superimposition of stacking faults along twin boundaries during deformation twinning and the glide of climb-dissociated partial dislocations allowed by stacking fault migration are discussed. The possible relationship between the formation mechanisms for these defects and the low- temperature recrystallization and self-annealing of defects in monazite is considered.

Evaluation of Thermoelectric Properties of Cu3.21Bi4.79S9 Bismuth Chalcogenide

2016 ◽  
Vol 701 ◽  
pp. 220-224
Author(s):  
Milan Chandra Barma ◽  
Bui Duc Long ◽  
Mohd Faizul Mohd Sabri ◽  
Ramesh Singh ◽  
Suhana Mohd Said ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Mechanical Alloying ◽  
Seebeck Coefficient ◽  
Single Phase ◽  
Hot Isostatic Pressing ◽  
Milled Powder ◽  
Measuring System ◽  
Secondary Phases ◽  
Type Conversion ◽  
Increasing Temperature

Cu3.21Bi4.79S9 was synthesized from Cu, Bi and S element powders using mechanical alloying method. The formation of Cu3.21Bi4.79S9 was identified using XRD and the changes of morphologies of the mixtures of Cu, Bi, and S powders during milling were observed using table top SEM. The milled powders were sintered using Hot-isostatic pressing at 230°C with a pressure of 50 MPa. Electrical resistivity and Seebeck coefficient of sintered samples were measured using ZEM-3 (Electrical resistivity and Seebeck Coefficient measuring System). Cu3.21Bi4.79S9 and some secondary phases were found in the 5h milled powder but single phase Cu3.21Bi4.79S9 was only obtained after milling for 15 h. A minimum electrical resistivity of sintered Cu3.21Bi4.79S9 sample was found to be 0.66 Ω.m at 170°C. We observed that a n- to p-type conversion at temperature of around 75 °C. However, a maximum n-type Seebeck coefficient of Cu3.21Bi4.79S9 was of -214 μV/K at 45 °C. The Seebeck coefficient decreases with increasing temperature and it reaches zero value at around 75 °C and then p-type Seebeck coefficient increases with increasing the temperature. The maximum p-type Seebeck coefficient was observed of 202 μV/K at 170°C.

scholarly journals Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy

2015 ◽  
Vol 107 (9) ◽  
pp. 091901 ◽  
Author(s):  
S. B. Jin ◽  
K. Zhang ◽  
R. Bjørge ◽  
N. R. Tao ◽  
K. Marthinsen ◽  
...  
Keyword(s):  
Deformation Twin ◽  
Coarse Grained ◽  
Twin Boundaries

THE Pr AND OXYGEN CORRELATION IN THE GdPr123 SYSTEM

2002 ◽  
Vol 16 (25) ◽  
pp. 943-953 ◽  
Author(s):  
H. KHOSROABADI ◽  
V. DAADMEHR ◽  
M. AKHAVAN
Keyword(s):  
Electrical Resistivity ◽  
Transition Temperature ◽  
Linear Dependence ◽  
Single Phase ◽  
Hole Concentration ◽  
Resistivity Measurements ◽  
Annealing Method

We prepared single-phase polycrystalline Gd 1 - x Pr x Ba 2 Cu 3 O 7 - δ samples with x = 0, 0.10, 0.15, and 0.20. The deoxygenation process of these samples was performed by an annealing method. Electrical resistivity measurements revealed depression of the transition temperature with the increase of x and δ. We calculated the hole concentration in the CuO 2 plane for different values of x and δ. A linear dependence of transition temperature and hole concentration in the CuO 2 plane was found as a function of 2δ + x. It is proposed that a combination of the localization and filling of holes should be considered as the effective mechanisms for the appearance of the Pr anomaly in HTSCs.

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