scholarly journals Phonon-glass electron-crystal behaviour by A site disorder in n-type thermoelectric oxides

2017 ◽  
Vol 10 (9) ◽  
pp. 1917-1922 ◽  
Author(s):  
L. M. Daniels ◽  
S. N. Savvin ◽  
M. J. Pitcher ◽  
M. S. Dyer ◽  
J. B. Claridge ◽  
...  
Keyword(s):  
Site Disorder ◽  
Thermoelectric Oxides ◽  
A Site ◽  
Electron Crystal

Phonon-glass electron-crystal (PGEC) behaviour is realised in La0.5Na0.5Ti1–xNbxO3 thermoelectric oxides.

A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-xSrxMnO3

2012 ◽  
Vol 112 (7) ◽  
pp. 073905 ◽  
Author(s):  
Sk. Sabyasachi ◽  
A. Karmakar ◽  
S. Majumdar ◽  
S. Giri ◽  
S. Das ◽  
...  
Keyword(s):  
Charge Ordering ◽  
Site Disorder ◽  
A Site

Effects of A-site disorder in the properties of A2CoMnO6(A = La, Tb)

2014 ◽  
Vol 26 (38) ◽  
pp. 386001 ◽  
Author(s):  
J Blasco ◽  
J García ◽  
G Subías ◽  
J Stankiewicz ◽  
S Lafuerza ◽  
...  
Keyword(s):  
Site Disorder ◽  
A Site

A-site disorder induced collapse of charge-ordered state and phase separated phase in manganites

2006 ◽  
Vol 89 (22) ◽  
pp. 222505 ◽  
Author(s):  
K. F. Wang ◽  
F. Yuan ◽  
S. Dong ◽  
D. Li ◽  
Z. D. Zhang ◽  
...  
Keyword(s):  
Site Disorder ◽  
A Site ◽  
Ordered State

Study of A-Site Disorder Dependent Structural, Magnetic, and Magnetocaloric Properties in La0.7-xSmxCa0.3MnO3Manganites

2013 ◽  
Vol 52 (10S) ◽  
pp. 10MC12 ◽  
Author(s):  
Mohammad Shafique Anwar ◽  
Faheem Ahmed ◽  
Seung Rok Lee ◽  
Rehan Danish ◽  
Bon Heun Koo
Keyword(s):  
Site Disorder ◽  
Magnetocaloric Properties ◽  
A Site

A-Site Deficient SrTiO3: A Possible Phonon-Glass Electron-Crystal?

MRS Advances ◽  
2016 ◽  
Vol 1 (60) ◽  
pp. 3997-4002 ◽  
Author(s):  
Srinivasa R. Popuri ◽  
Jan-Willem G. Bos
Keyword(s):  
Thermal Conductivity ◽  
Electrical Properties ◽  
Oxygen Deficiency ◽  
Charge Carriers ◽  
Conductivity Data ◽  
Fixed Amount ◽  
Figures Of Merit ◽  
Nb Content ◽  
A Site ◽  
Electron Crystal

ABSTRACTThe thermoelectric properties of polycrystalline samples of Sr1-xLa0.67xTiO3-δ and Sr0.20La0.53Ti1−yNbyO3-δ have been investigated. The first series has a gradually increasing amount of A-site vacancies, and charge carriers linked to the oxygen deficiency. The second series has a fixed amount of A-site vacancies (27%) and variation of the Nb content was used to optimise the electrical properties. Maximum power factors of 0.6 mW m-1 K-2 for x = 0.4 and 0.4 mW m-1 K-2 for y = 0.05 were observed at 700 K. Combining these values with thermal conductivity data obtained previously, suggests that maximum figures of merit zT = 0.16 for x = 0.4 and zT = 0.2 for y = 0.05 are possible at 1000 K. This study contributes new insight on the interplay between A-site vacancies and thermoelectric performance in SrTiO3.

A-Site Cational Size Disorder Effects in La0.55Ca0.45MnO3

2007 ◽  
Vol 336-338 ◽  
pp. 351-355
Author(s):  
K.F. Wang ◽  
X.P. Liu ◽  
Q.C. Li ◽  
Y. Wang ◽  
L.F. Wang ◽  
...  
Keyword(s):  
Ground State ◽  
Curie Point ◽  
Atomic Fraction ◽  
Ionic Radii ◽  
Disorder Effects ◽  
Radial Distortion ◽  
Site Disorder ◽  
Glass Insulator ◽  
A Site ◽  
Cation Size

The effects of A-site cation size disorder in ABO3 type ferromagnetic metallic La0.55Ca0.45MnO3 system have been studied by substituting La3+ and Ca2+ by other ions, while keeping the valency of Mn ions and the A-site cation mean radius <rA> constant in the substituted compounds with different A-site ionic radii variance σ2 = Σi (xiri 2 − <rA>2), where xi and ri are the atomic fraction and ionic radii of i-type ions at A-site, respectively. It is revealed that the A-site disorder induces the decreasing of the magnetization and the increasing of the resistivity. The ferromagnetic Curie point TC decreases with the increasing of the A-site ionic radii variance, too. Moreover, the ground state of the system transits from ferromagnetic metal to glass insulator upon increasing variance of the A-site ionic radii from 0.0003 for La0.55Ca0.45MnO3 to 0.009 for Gd0.55Sr0.45MnO3. It is argued that the suppression of the ferromagnetism is ascribed to the enhanced radial distortion of the MnO6 octahedra due to the increasing A-site disorder.

scholarly journals A and B site doping of a phonon-glass perovskite oxide thermoelectric

2018 ◽  
Vol 6 (32) ◽  
pp. 15640-15652 ◽  
Author(s):  
L. M. Daniels ◽  
S. Ling ◽  
S. N. Savvin ◽  
M. J. Pitcher ◽  
M. S. Dyer ◽  
...  
Keyword(s):  
Perovskite Oxide ◽  
Structural Symmetry ◽  
Thermoelectric Oxides ◽  
Electron Crystal

The effect of structural symmetry is investigated in phonon-glass electron-crystal (PGEC) La1−yKyTiO3 and La0.5K0.5Ti1−zNbzO3 thermoelectric oxides

Ferromagnetic metal to cluster-glass insulator transition induced by A-site disorder in manganites

2006 ◽  
Vol 88 (15) ◽  
pp. 152505 ◽  
Author(s):  
K. F. Wang ◽  
Y. Wang ◽  
L. F. Wang ◽  
S. Dong ◽  
H. Yu ◽  
...  
Keyword(s):  
Ferromagnetic Metal ◽  
Insulator Transition ◽  
Site Disorder ◽  
Glass Insulator ◽  
A Site
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