High-pressure synthesis and crystal structures of the strontium oxogallates Sr2Ga2O5 and Sr5Ga6O14

Kahlenberg, Volker; Goettgens, Valerie Sue; Mair, Philipp; Schmidmair, Daniela

doi:10.1016/j.jssc.2015.04.016

Cited by 4 publications

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“…98 In addition, Sr2Ga2O5 has been synthesized under 1.5 GPa of pressure, but this material does not form a brownmillerite structure. 99 There is one report on the crystal structure of Ca2Fe0.5Ga1.5O5, synthesized using standard solid-state synthesis method. 98 However, that study only reports the crystal structure using X-ray diffraction, and no other information regarding properties of Ca2Fe0.5Ga1.5O5 has been reported.…”

Section: Introductionmentioning

confidence: 99%

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

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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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Section: Introductionmentioning

confidence: 99%

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

Hona¹

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ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr₂Ga₂O₅ and Sr₅Ga₆O₁₄.

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Electrical properties of the ordered oxygen-deficient perovskite Ca2Fe0.5Ga1.5O5

Hona

Huq

Ramezanipour

2018

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High-pressure synthesis and crystal structures of the strontium oxogallates Sr2Ga2O5 and Sr5Ga6O14

Cited by 4 publications

References 39 publications

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

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

ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr₂Ga₂O₅ and Sr₅Ga₆O₁₄.

Electrical properties of the ordered oxygen-deficient perovskite Ca2Fe0.5Ga1.5O5

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High-pressure synthesis and crystal structures of the strontium oxogallates Sr2Ga2O5 and Sr5Ga6O14

Cited by 4 publications

References 39 publications

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

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

ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr2Ga2O5 and Sr5Ga6O14.

Electrical properties of the ordered oxygen-deficient perovskite Ca2Fe0.5Ga1.5O5

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ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr₂Ga₂O₅ and Sr₅Ga₆O₁₄.