1998
DOI: 10.1006/jssc.1998.7829
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Polaronic Conduction in La2−Sr CoO4(0.25≤x≤1.10) below Room Temperature

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Cited by 40 publications
(32 citation statements)
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References 48 publications
(67 reference statements)
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“…The bulk conductivity should be given firstly if investigation of the conductive mechanism of La 2 CuSnO 6 ceramics is needed. As shown in the work of Iguchi et al [20], the impedance spectrum is used to determine the contribution from the grain interiors, grain boundaries and interface of sample-electrode, and the response frequency decreases in the turn. The typical impedance spectra at various temperatures are shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The bulk conductivity should be given firstly if investigation of the conductive mechanism of La 2 CuSnO 6 ceramics is needed. As shown in the work of Iguchi et al [20], the impedance spectrum is used to determine the contribution from the grain interiors, grain boundaries and interface of sample-electrode, and the response frequency decreases in the turn. The typical impedance spectra at various temperatures are shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…[10][11][12] It is well known that the dimensionality of a system is a key factor governing its electronic structure, and thus, twodimensional ͑2D͒ layered cobalt oxides are quite interesting to compare with the three-dimensional ͑3D͒ perovskites. Thus far, various studies have been carried out on K 2 NiF 4 -type cobalt oxides, [13][14][15][16][17][18][19][20] 4 according to their theoretical studies using the unrestricted Hartree-Fock approximation and the real-space recursion method. 19,20 In the present study, we have developed a K 2 NiF 4 -type cobalt oxide with only Co 4+ ions, Sr 2 CoO 4 , using a high pressure and high temperature technique.…”
mentioning
confidence: 99%
“…The activation energy of bulk resistivities is just a bit larger than that of dielectric relaxation, while that of grain boundary is smaller. In the polaronic scenario [22], the activation energy required for electrical conduction due to a hopping process of small polarons is the sum of the hopping energy, which is equal to that of the dielectric relation, and half of the potential difference between a free polaron and a polaron bound to a trap. So the activation energy of electrical conduction should be larger than that of dielectric relaxation.…”
Section: Resultsmentioning
confidence: 99%