Structural and thermoelectric properties of n-type Sr1−x Ti x MnO3−δ perovskite system

Kim, C. M.; Seo, Jang Woo; Choi, Soon‐Mok; Seo, Won Seon; Lee, S.; Lim, Young Soo; Park, K.

doi:10.1007/s13391-014-4237-9

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…Perovskite oxides exhibit a wide range of structural, electrical and magnetic properties. [1][2][3][4] They have been studied for their potential applications in different technological fields, such as fuel cells, thermoelectric devices and sensors. 2,5,6 The structure and properties of perovskites can vary significantly [7][8][9][10][11][12][13][14] upon variation of the A-or B-site cations in the ABO 3 formula, where the A-cations occupy the 12-coordinated sites located between the BO 6 octahedra.…”

Section: Introductionmentioning

confidence: 99%

Structure-dependence of electrical conductivity and electrocatalytic properties of Sr2Mn2O6 and CaSrMn2O6

Hona

Ramezanipour

2019

J Chem Sci

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Remarkable enhancement of the electrical conductivity and electrocatalytic activity is demonstrated as a result of the transformation of crystal structure between Sr 2 Mn 2 O 6 and CaSrMn 2 O 6. The structure of Sr 2 Mn 2 O 6 is known to consist of dimeric units of face-sharing MnO 6 octahedra. Whereas, CaSrMn 2 O 6 contains individual octahedra, connected to each other through corner-sharing. Herein we show that the changes in the crystal structure result in significant improvement of the electrical conductivity, by five orders of magnitude, for CaSrMn 2 O 6 , compared to Sr 2 Mn 2 O 6. Variable temperature conductivity studies from 25-800°C indicate semiconducting properties for both compounds, where the enhanced conductivity of CaSrMn 2 O 6 persists in the entire temperature range. The electrocatalytic activity of both compounds toward oxygen evolution reaction (OER) has also been investigated, indicating superior OER activity of CaSrMn 2 O 6 compared to Sr 2 Mn 2 O 6. A pronounced improvement in the onset potential and kinetics of OER is observed for CaSrMn 2 O 6. These studies demonstrate an important correlation between crystal structure, electrical conductivity and electrocatalytic properties.

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Section: Introductionmentioning

confidence: 99%

Structure-dependence of electrical conductivity and electrocatalytic properties of Sr2Mn2O6 and CaSrMn2O6

Hona

Ramezanipour

2019

J Chem Sci

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“…As such, the conversion efficiency (η) of thermoelectric devices should be enhanced. The conversion efficiency is expressed as follows:

η = \frac{T_{normalH} - T_{normalC}}{T_{H}} [\frac{\sqrt[]{1 + Z T} - 1}{\sqrt{1 + Z T} + (T_{normalC} / T_{normalH})}]

where T H is the temperature at hot junction, T C is the temperature at cold junction, T is the average of T H and T C , and Z is the figure of merit, which is defined as follows:

Z = \frac{σ {normalα}^{2}}{normalκ}

where σ is the electrical conductivity, α is the Seebeck coefficient, and κ is the thermal conductivity. The dimensionless figure of merit (ZT) measures the quality of thermoelectric materials for applications.…”

Section: Introductionmentioning

confidence: 99%

Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

et al. 2017

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Ca 0.8 Y 0.2Àx Dy x MnO 3Àd (0≤x≤0.2) samples were fabricated by the solid-state reaction method, and their thermoelectric properties were studied from 500°C to 800°C. Upon the substitution of Dy 3+ for Y 3+ in the Ca 0.8 Y 0.2Àx Dy x MnO 3Àd , the electrical and thermal conductivities gradually decreased with increasing Dy 3+ concentration, whereas the absolute value of the Seebeck coefficient significantly increased. The Ca 0.8 Dy 0.2 MnO 3Àd showed the largest value of dimensionless figure of merit (0.180) at 800°C as a result of the combination of the largest absolute value of the Seebeck coefficient and the lowest thermal conductivity. We believe that the Ca 0.8 Dy 0.2 MnO 3Àd is a promising thermoelectric material at high temperatures.

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“…For BaSrCoFeO6-δ, the conductivity is higher, but the difference between the conductivity values at low and high temperature is not as significant as that of fields, such as fuel cells, thermoelectric devices and sensors. 148,[182][183] The structure and properties of perovskites can vary significantly 4, 84-85, 92, 120, 184-186 upon variation of the Aor B-site cations in the ABO3 formula, where the A-cations occupy the 12-coordinated sites located between the BO6 octahedra.…”

Section: Electrical Conductivitymentioning

confidence: 99%

“…147 This structure transforms into a cubic perovskite structure if the degree of oxygendeficiency changes to 0.25 ≤ δ ≤ 0.38. [147][148]82 Another example is Sr2Fe2O6-δ, where a series of different phases have been reported, depending on the variation of the δ value. 83 The arrangement of oxygen-vacancies in the crystal lattice is also important.…”

Section: Introductionmentioning

confidence: 99%

Oxygen deficient perovskites: effect of structure on electrical conductivity, magnetism and electrocatalytic activity.

Hona¹

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Oxygen evolution reaction …………………………………………....19 CHAPTER 2. TRANSFORMATION OF STRUCTURE, ELECTRICAL CONDUCTIVITY AND MAGNETISM IN AA'Fe2O6-δ, A=Sr, Ca and A'= Sr..…... 21 Introduction ………………………………………………………………….. 21 Experimental ……... …………………………………………………………. 23 Results and discussion ………………………………………………………. 25 Crystal structure ……………………………………………………... 25 Magnetic structure …………………………………………………… 33 Electrical Properties ………………………………………………..… 36 Conclusion ………………………………………………………………...…. 43 CHAPTER 3. UNRAVELING THE ROLE OF STRUCTURAL ORDER IN TRANSFORMATION OF ELECTRICAL CONDUCTIVITY IN Ca2FeCoO6-δ, CaSrFeCoO6-δ and Sr2FeCoO6-δ …………………………………………………..….. 44 ix Introduction ………………………………………………………………...…. 44 Experimental ………………………………………………………………..…. 46 Results and discussion …………………………………….…………………. 48 Crystal structure ………………………………………….…………… 48 X-ray photoelectron spectroscopy …………………………………… 61 Electrical conductivities ……………………………………...………. 65 Conclusion …………………………………………………………………….. 73 CHAPTER 4. MAGNETIC STRIUCTURE OF CaSrFeCoO5 ………………..……… 75 Introduction …………………………………………………………….……….75 Experimental section ……………………………………………….………….. 77 Results and discussion ………………………………………………………….……. 78 Conclusion ……………………………………………………………….…………… 86 CHAPTER 5. ELECTRICAL PROPERTIES OF ORDERED OXYGEN-DEFICIENT PEROVSKITE Ca2Fe0.5Ga1.5O5…………..…..……………………………………….. 87 Introduction …………………………………………….……………………. 87 Materials and methods ………………………………….……………………. 90 Results and discussion ……………………………………...……….…………91 Crystal structure …………………………………………….….……… 91 x Electrical properties ………………………………..………….……… 94 Conclusion ……………………………………………..…………..…………. 99 CHAPTER 6. ENHANCED ELECTRICAL PROPERTIES OIN BaSrFe2O6-δ (δ=0.5): A DISORDERED DEFECT-PEROVSKITE………………………..………………..…. 100 Introduction …………………………………………………….…………… 100 Experimental……… ………………………………………..……………….. 102 Results and discussion …………………………………………..…………… 103 Crystal structure …………………………………………………...…. 103 Magnetic properties ………………………………………...…………109 Electrical properties ………………………………………………….. 111 Conclusion ……………………………………………….………………….. 115 CHAPTER 7. CHARGE-TRANSPORT PROPERTIES OF Ca2FeGaO6-δ AND CaSrFeGaO6-δ: THE EFFECT OF DIFECT-ORDERED .……………………...…….. 117 Introduction ………………………………………………………………….. 117 Experimental …………………………………………….………………….. 120 Results and discussion ………………………………..……………………… 121 Crystal structure ……………………………………………….…….. 121 Microstructure and X-ray photoelectron spectroscopy studies…………125 Electrical properties ………………………………….………………. 127 Conclusion ………………………………………………………..…………. 133 xi CHAPTER 8. DISPARITY IN ELECTRICAL AND MAGNETIC PROPERTIES OF ISOSTRUCTURAL OXYGEN-DEFICIENT PEROVSKITES BaSrCo2O6-δ AND BaSrCoFeO6-δ ………..………….……………………………………………..…….. 134 Introduction ……………………………………………………….…………. 134 Experimental……… …………………………………….….………………… Results and discussion …………………………………….……...………….. Crystal structure and crystallite morphology …….………….………… X-ray photoelectron spectroscopy (XPS) and iodometric titration ….…141 Magnetic properties ……………………………………………....…… Electrical conductiviti...

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Structural and thermoelectric properties of n-type Sr1−x Ti x MnO3−δ perovskite system

Cited by 10 publications

References 28 publications

Structure-dependence of electrical conductivity and electrocatalytic properties of Sr2Mn2O6 and CaSrMn2O6

Structure-dependence of electrical conductivity and electrocatalytic properties of Sr2Mn2O6 and CaSrMn2O6

Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)

Oxygen deficient perovskites: effect of structure on electrical conductivity, magnetism and electrocatalytic activity.

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Structural and thermoelectric properties of n-type Sr1−x Ti x MnO3−δ perovskite system

Cited by 10 publications

References 28 publications

Structure-dependence of electrical conductivity and electrocatalytic properties of Sr2Mn2O6 and CaSrMn2O6

Structure-dependence of electrical conductivity and electrocatalytic properties of Sr2Mn2O6 and CaSrMn2O6

Electrical transport and thermoelectric properties of Ca0.8Y0.2−xDyxMnO3−δ (0 ≤ x ≤ 0.2)

Oxygen deficient perovskites: effect of structure on electrical conductivity, magnetism and electrocatalytic activity.

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Electrical transport and thermoelectric properties of Ca_0.8Y_0.2−xDy_xMnO_3−δ (0 ≤ x ≤ 0.2)