Effects of Cation Substitution on the Thermoelectric Properties in Ca-Co-O

2001 ◽  
Vol 691 ◽  
Author(s):  
Ichiro Matsubara ◽  
Ryoji Funahashi ◽  
Masahiro Shikano ◽  
Kei Sasaki ◽  
Hiroyuki Enomoto
Keyword(s):  
Thin Films ◽  
Solid Solution ◽  
Thermoelectric Power ◽  
Compressive Stress ◽  
Thermoelectric Properties ◽  
Plane Stress ◽  
Solution Process ◽  
Cation Substitution ◽  
Combinatorial Approach ◽  
Solid Solution Range

ABSTRACTWe have prepared (Ca1−x−yMxBiy)3Co4Oz (M = Mg, Sr, and Ba) thin films by a combinatorial approach using a solution process. In the systems of (Ca1−x−yMxBiy)3Co4Oz (M = Mg, Sr, and Ba), solid solution range was determined to be × < 0.8 (M = Sr, y = 0), x < 1.0 (M = Mg, y = 0), x = 0.0 (M = Ba, y = 0), and x < 0.4 (M = Bi, x = 0). No solid solution range was obtained for the substitution of Ba for Ca site. The in-plane compressive stress in the CoO2 sublattice is controllable by the cation substitution for Ca in the (Ca2CoO3) sublattice. With increasing in-plane stress, the magnitude of thermoelectric power and resistivity increased.

scholarly journals Large thermoelectric power variations in epitaxial thin films of layered perovskite GdBaCo2O5.5±δ with a different preferred orientation and strain

2020 ◽  
Vol 8 (38) ◽  
pp. 19975-19983
Author(s):  
Arindom Chatterjee ◽  
Emigdio Chavez-Angel ◽  
Belén Ballesteros ◽  
José Manuel Caicedo ◽  
Jessica Padilla-Pantoja ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Tensile Strain ◽  
Preferred Orientation ◽  
Oxygen Stoichiometry ◽  
Layered Perovskite ◽  
Epitaxial Thin Films ◽  
P Type

Oxygen stoichiometry in epitaxial GdBaCo2O5.5±δ films accommodates the strain, which substantially affects thermoelectric properties, bringing the material from p-type (tensile strain c⊥-oriented on STO) to n-type thermopower (compressive b⊥ on LAO).

Enhanced thermoelectric properties of PEDOT:PSS nanofilms by a chemical dedoping process

2014 ◽  
Vol 2 (18) ◽  
pp. 6532-6539 ◽  
Author(s):  
Hongkwan Park ◽  
Seung Hwan Lee ◽  
Felix Sunjoo Kim ◽  
Hyang Hee Choi ◽  
In Woo Cheong ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Conjugated Polymer ◽  
Polymer Thin Films ◽  
Post Processing ◽  
Power Generators

Our results indicate that a well-designed simple post-processing process can boost the efficiency of thermoelectric power generators made of conjugated polymer thin films.

Processing and Characterisation of Single‐Phase Superconducting Thin Films in the Bi‐Sr‐Ca‐Cu‐O System from Chemical Precursors

1989 ◽  
Vol 169 ◽  
Author(s):  
S. J. Golden ◽  
T. E. Bloomer ◽  
F. F. Lange ◽  
A. M. Segadaes ◽  
K. J. Vaidya ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Solid Solution ◽  
Single Phase ◽  
Bulk Material ◽  
Superconducting Thin Films ◽  
Film Properties ◽  
Ethyl Hexanoate ◽  
Film Study ◽  
Solid Solution Range

AbstractThin films in the Bi‐Sr‐Ca‐Cu‐O system have been synthesized from liquid ethyl hexanoate precursors by spin pyrolysis. An extensive solid solution range was determined for the two Cu‐layer phase through the study of c‐axis oriented, single‐phase thin films fabricated on single‐crystal MgO (100). Extensive cation non‐stoichiometry was observed in all cases. The variation of important thin film properties with composition within the solid solution range have been described.Utilising the results from the thin film study together with data relating to liquid formation in mixtures of bulk material a working model describing the formation of the two‐layer phase has been formulated. The two‐layer phase is formed as the result of precipitation from a fugitive liquid at temperatures exceeding 730 *C.

A combinatorial approach to solution-processed InGaO3(ZnO)m superlattice films: growth mechanisms and their thermoelectric properties

CrystEngComm ◽  
2016 ◽  
Vol 18 (5) ◽  
pp. 807-815 ◽  
Author(s):  
Sung Woon Cho ◽  
Myoungho Jeong ◽  
Jun Hyeon Kim ◽  
Yong Hun Kwon ◽  
Hyoungsub Kim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Single Phase ◽  
Combinatorial Approach ◽  
Growth Mechanisms ◽  
Transmission Electron ◽  
Superlattice Structures ◽  
Growth Evolution

The strong single-phase InGaO3(ZnO)m films with superlattice structures showed superior thermoelectric power factors. Their microstructural growth evolution was investigated using transmission electron microscopy in detail.

Structure and thermoelectric properties of binary and Fe-doped iridium silicide thin films

2000 ◽  
Vol 15 (3) ◽  
pp. 772-782 ◽  
Author(s):  
W. Pitschke ◽  
R. Kurt ◽  
A. Heinrich ◽  
J. Schumann ◽  
H. Grießmann ◽  
...  
Keyword(s):  
Thin Films ◽  
Electron Beam ◽  
Thermoelectric Power ◽  
Structure Formation ◽  
Thermoelectric Properties ◽  
Formation Process ◽  
Physical Vapor Deposition ◽  
Thermoelectric Power Factor ◽  
Structure Formation Process ◽  
Thermoelectric Transport Properties

The structure-formation process and thermoelectric properties of binary and Fe-doped IrxSi1−x (0.30 ≤ x ≤ 0.41) thin films were investigated. The films were prepared by means of physical vapor deposition techniques, in particular by magnetron co-sputtering and electron beam co-evaporation. The amount of Fe dopant varied between 0 and 5 at.%. The phase-formation process depends on the volume fractions of the major components Ir and Si, whereas the small concentrations of dopant did not change the sequence of the crystalline phases formed. On the other hand, the thermoelectric transport properties correlate strongly with both the structure-formation process and the chemical composition of the films. Fe-doped iridium silicide films with useful thermoelectric power factors were successfully obtained by both magnetron co-sputtering and electron beam co-evaporation. A maximum thermoelectric power factor of 8.5 μW/(K2 cm) at 1200 K was observed for evaporated layers with thechemical composition Ir0.35Si0.63Fe0.02.

n-Type thermoelectric materials based on CuTCNQ nanocrystals and CuTCNQ nanorod arrays

2015 ◽  
Vol 3 (6) ◽  
pp. 2677-2683 ◽  
Author(s):  
Yuanhui Sun ◽  
Fengjiao Zhang ◽  
Yimeng Sun ◽  
Chong-an Di ◽  
Wei Xu ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Power ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Nanorod Arrays

The present work demonstrates the thermoelectric properties of CuTCNQ, including nanocrystals and thin films containing nanorod arrays. CuTCNQ displayed n-type thermoelectric behaviors with a relatively high thermoelectric power up to −632.1 μV K−1 at 370 K.

Preparation of Ba1−xSrxTiO3 Thin Films by Metalorganic Chemical Vapor Deposition and Their Properties

1993 ◽  
Vol 335 ◽  
Author(s):  
S. R. Gilbert ◽  
B. W. Wessels ◽  
D. A. Neumayer ◽  
T. J. Marks ◽  
J. L. Schindler ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid Solution ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Auger Spectroscopy ◽  
Organic Chemical ◽  
Titanium Tetraisopropoxide ◽  
Solid Solution Range ◽  
Metal Organic

AbstractBa1−xSrxTiO3 thin films were deposited over the entire solid solution range by low pressure metal-organic chemical vapor deposition. The metal-organic precursors employed were titanium tetraisopropoxide and barium and strontium(hexafl uoroacetylacetonate)2·tetraglyme. The substrates used were LaAlO3 and (100) p-type Si. Ba1−xSrxTiO3 films deposited on LaAlO3 were epitaxial, while the films deposited on Si showed no texture. Auger spectroscopy indicated that single phase Ba1−xSrxTiO3 films did not contain detectable levels of fluorine contamination. The dielectric constant was found to depend upon the solid solution composition x, and values as large as 220 measured at a frequency of 1 MHz were obtained. The resistivities of the as-deposited films ranged from 103 to 108 Ω-cm. Temperature dependent resistivity measurements indicated the films were slightly oxygen deficient.

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