Enhanced Thermoelectric Properties of BiCuSeO Ceramics by Bi Vacancies

2018 ◽  
Vol 913 ◽  
pp. 803-810 ◽  
Author(s):  
Wen Qiang Ma ◽  
Cheng Jie Deng ◽  
Jin Le Lan ◽  
Xiao Ping Yang ◽  
Yuan Hua Lin
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Power Factor ◽  
Slight Reduction ◽  
Temperature Synthesis ◽  
Pristine Sample ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Spark Plasma ◽  
Sintering Method

Polycrystalline Bi1-xCuSeO (0 ≤ x ≤ 0.05) ceramics were prepared by self-propagating high-temperature synthesis followed by spark plasma sintering method. All the samples correspond with single BiCuSeO phase and high vacancies sample had higher density. The highest power factor of 4.71×10-4 W.m-1.K-2 was obtained by 5% Bi vacancies at 873K, which is about 32% higher than that of the pristine sample. Along with slight reduction of thermal conductivity, the maximum ZT reached 0.68. The results show that vacancy engineering is a promising method for thermoelectric applications of BiCuSeO and related ceramics.

Spark plasma sintering of UHTC powders obtained by self-propagating high-temperature synthesis

2008 ◽  
Vol 43 (19) ◽  
pp. 6406-6413 ◽  
Author(s):  
Roberta Licheri ◽  
Roberto Orrù ◽  
Clara Musa ◽  
Antonio Mario Locci ◽  
Giacomo Cao
Keyword(s):  
High Temperature ◽  
Spark Plasma Sintering ◽  
Temperature Synthesis ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Spark Plasma

Fabrication of SPS Compacts from Ta, Hf-Containing ZrB2-ZrC Powder Mixtures Synthesized by the MA-SHS in Air Process

2006 ◽  
Vol 45 ◽  
pp. 1041-1046
Author(s):  
T. Tsuchida ◽  
K. Mochizuki
Keyword(s):  
High Temperature ◽  
Molar Ratio ◽  
Matrix Composites ◽  
Temperature Synthesis ◽  
Indentation Method ◽  
Homogeneous Microstructure ◽  
Powder Mixtures ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Spark Plasma

Mechanical Activation assisted Self-propagating High-temperature Synthesis in air (MA-SHS in air process) was successfully applied to the synthesis of the powder mixtures of ZrB2 and ZrC containing Ta and Hf as a precursor of Ultra High Temperature Ceramic (UHTC) matrix composites. When the powder mixtures of (Ta or Hf+Zr)/B/C=2/2/1 (Ta or Hf/Zr=0/2, 0.1/1.9, 0.2/1.8, 0.4/1.6) in molar ratio were mechanically activated (MA) by ball milling for 45-60 min and then exposed to air, they self-ignited spontaneously and the self-propagating high-temperature synthesis (SHS) was occurred to form ZrB2 and ZrC. From these MA-SHS powders, the Ta, Hf-containing ZrB2-ZrC composite compacts having a fine and homogeneous microstructure composed of < 5 μm-sized grains were fabricated by spark plasma sintering (SPS) at 1800°C. The mechanical properties of the composites evaluated by Vickers indentation method was improved by the addition of Ta and showed the values of Vickers hardness (HV) of 16.9 GPa and fracture toughness of 4.3 MPa·m1/2.

AlMgB14–TiB2 composite materials obtained by self-propagating high-temperature synthesis and spark plasma sintering

2020 ◽  
Vol 46 (14) ◽  
pp. 22733-22737
Author(s):  
P.Yu. Nikitin ◽  
I.A. Zhukov ◽  
A.E. Matveev ◽  
S.D. Sokolov ◽  
M.S. Boldin ◽  
...  
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Spark Plasma Sintering ◽  
Temperature Synthesis ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Spark Plasma

IR-transparent MgO-Y2O3 ceramics by self-propagating high-temperature synthesis and spark plasma sintering

2020 ◽  
Vol 46 (10) ◽  
pp. 15786-15792
Author(s):  
D.A. Permin ◽  
M.S. Boldin ◽  
A.V. Belyaev ◽  
S.S. Balabanov ◽  
A.V. Novikova ◽  
...  
Keyword(s):  
High Temperature ◽  
Spark Plasma Sintering ◽  
Temperature Synthesis ◽  
Plasma Sintering ◽  
High Temperature Synthesis ◽  
Spark Plasma
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