New ternary alkalioxometallates of the first-row transition-metal elements through the azide nitrate route [Elektronische Ressource] / vorgelegt von Naveed Zafar Ali

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Max-Planck-Institute für Festkörperforschung Stuttgart New ternary alkalioxometallates of the first-row transition-metal elements through the Azide Nitrate Route Naveed Zafar Ali Dissertation an der Universität Stuttgart Stuttgart, 2011 New ternary alkalioxometallates of the first-row transition-metal elements through the Azide Nitrate Route Von der Fakultät Chemie der Universität Stuttgart zur Erlangung der Würde eines Doktors der Naturwissenschaften (Dr. rer. nat.) genehmigte Abhandlung Vorgelegt von Naveed Zafar Ali aus Islamabad, Pakistan Hauptberichter: Prof. Dr. Dr. h. c. mult. Martin Jansen Mitberichter: Prof. Dr. Robert E. Dinnebier Mitprüfer und Prüfungsvorsitzender: Prof. Dr. Thomas Schleid Tag der Einreichung der Arbeit: 26.01.2011 Tag der mündlichen Prüfung: 02.03.2011 Max-Planck-Institut für Festkörperforschung, Stuttgart 2011 Dedicated to: My Adorable Family. Table of contents Contents 1: Introduction…………………………………….……………………………… 1 2: Methods and instrumentation………………………………………………… 14 2.1 Working Methodology……………………………………………………… 14 2.1.1 Working under inert atmosphere……………..………………… 14 2.1.1.

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• Published by: universitat_stuttgart
• Published: 01 January 2011
• Reads: 44
• Language: English
• Document size: 18 MB

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Max-Planck-Institute für Festkörperforschung

Stuttgart







New ternary alkalioxometallates of the first-row
transition-metal elements through the
Azide Nitrate Route

Naveed Zafar Ali















Dissertation an der Universität Stuttgart

Stuttgart, 2011




New ternary alkalioxometallates of the first-row transition-
metal elements through the Azide Nitrate Route



Von der Fakultät Chemie der Universität Stuttgart
zur Erlangung der Würde eines
Doktors der Naturwissenschaften (Dr. rer. nat.)
genehmigte Abhandlung



Vorgelegt von
Naveed Zafar Ali
aus Islamabad, Pakistan



Hauptberichter: Prof. Dr. Dr. h. c. mult. Martin Jansen
Mitberichter: Prof. Dr. Robert E. Dinnebier
Mitprüfer und Prüfungsvorsitzender: Prof. Dr. Thomas Schleid


Tag der Einreichung der Arbeit: 26.01.2011
Tag der mündlichen Prüfung: 02.03.2011



Max-Planck-Institut für Festkörperforschung, Stuttgart
2011










































































































Dedicated to: My Adorable Family.
Table of contents
Contents
1: Introduction…………………………………….……………………………… 1

2: Methods and instrumentation………………………………………………… 14
2.1 Working Methodology……………………………………………………… 14
2.1.1 Working under inert atmosphere……………..………………… 14
2.1.1.1 Vacuum and inert gas glass apparatus.......................... 14
2.1.1.2 Glove box..................................................................... 16
2.1.1.3 Schlenk technique........................................................ 17
2.1.2 Investigation under high pressure……………………………… 18
2.1.3 Azide-Nitrate/Nitrite Route…………………………………….. 20
2.1.4 Crystal growth………………………………………………….. 22
2.1.5 High – temperature laboratory furnaces………….…………... 23
2.2 Analytical Techniques………………………………………….…………. 24
2.2.1 X-ray diffraction methods………………………….………… 24
2.2.2 Powder X-ray diffraction………………………….…………. 24
2.2.3 Precession technique………………………………………….... 30
2.2.4 Single crystal diffraction……………………………………….. 31
2.2.5 Raman spectroscopy…………………………………………… 33
2.2.6 Energy dispersive X-ray spectroscopy (EDX+SEM) …………. 33
2.2.7 Thermal analysis…………………………………….................. 34
2.2.8 Temperature dependence of the specific heat (Cp) ……............. 36
2.2.9 Conductivity measurements…………………………................. 36
2.2.10 Magnetic measurements…………………………..................... 37
2.2.11 Mössbauer spectroscopy………………………........................ 40
2.2.12 Synchrotron radiation………………………............................. 43
2.2.13 Neutron diffraction………………………................................. 44
2.2.14 MAPLE calculations…………………….................................. 46
2.2.15 Bilbao crystallographic server……………………................... 47
2.3 References……………………....................................................................... 47
i Table of contents
3: Synthesis of (active) starting materials………………...................................... 50
3.1 Synthesis of alkali azides (AN ) ……………………..................................... 50 3
3.1.1 Lithium, potassium, rubidium and cesium azides….................... 50
3.1.2 Drying Assembly......................................................................... 54
3.2 Synthesis of (active) transition metal binary oxides....................................... 55
3.2.1 Iron(III)-oxide, Fe O ................................................................... 55 2 3
3.2.2 Cobalt(II-III)-oxide, Co O .......................................................... 57 3 4
3.2.3 Copper (II)-oxide, CuO................................................................ 58
3.2.4 Chromium (III)-oxide, Cr O ....................................................... 59 2 3
3.3 References....................................... ............................................................... 60

4: The AFeO (A = K, Rb and Cs) family 2
Three-dimensional magnetic iron oxides……………….................................... 61
4.1 Introduction…................................................................................................. 62
4.2 Experimental................................................................................................... 67
4.2.1 Synthesis...................................................................................... 67
4.2.2 X-ray single crystal diffraction.................................................... 68
4.2.3 High-resolution synchrotron powder diffraction......................... 73
4.2.4 Neutron diffraction experiments................................................. 73
4.2.5 Thermal analysis and magnetic susceptibility measurement…... 75
4.2.6 Mössbauer Spectroscopy on RbFeO and CsFeO ...................... 75 2 2
4.3 Results and discussion..................................................................................... 76
4.3.1 Single crystal X-ray diffraction.................................................... 76
4.3.2 Thermal analysis and magnetic susceptibility characterization……… 87
4.3.3 High-resolution synchrotron powder diffraction………………. 90
4.3.4 Neutron scattering experiments................................................... 102
4.4 Discussion and Conclusions............................................................................ 116
4.5 Mössbauer Spectroscopy on RbFeO and CsFeO .......................................... 122 2 2
4.6 Parametric Rietveld refinement....................................................................... 129
4.7 References....................................................................................................... 132

ii Table of contents
5: New two-dimensional layered magnetic oxides................................................ 136
5-A: Synthesis, crystal structure and magnetic properties of CsCoO , 2
a new two dimensional layered structure............................................................ 137
5.1 Introduction..................................................................................................... 137
5.2 Experimental Details....................................................................................... 139
5.3 Results and discussion..................................................................................... 144
5.3.1 Single crystal X-ray diffraction.................................................... 144
5.3.2 Structural phase transitions in CsCoO ........................................ 150 2
5.3.3 The result of a temperature-dependent resistivity........................ 154
5.3.4 Thermal analysis and magnetic characterization......................... 156
5.4 Conclusion....................................................................................................... 159
5-B: Synthesis, crystal structure and magnetic properties of β-KCrO ........................ 161 2
5.5 Introduction..................................................................................................... 161
5.6 Experimental................................................................................................... 162
5.7 Results and discussion..................................................................................... 168
5.7.1 Description of crystal structure.................................................... 168
5.7.2 MAPLE calculations.................................................................... 170
5.8 Structural phase transitions............................................................................. 171
5.9 A comparison of α-KCrO to β-KCrO ........................................................... 174 2 2
5.10 Magnetic properties....................................................................................... 175
5.11 The specific heat for KCrO .......................................................................... 178 2
5.12 Conclusion..................................................................................................... 179
5.13 References..................................................................................................... 180


6: One-Dimensional Alkali-oxocuprates................................................................ 186
6.1. Synthesis, structure and magnetic properties of the new Wigner
crystallized chain cuprate Na Cu O ............................................................. 187 5 3 6
6.1.1 Introduction.................................................................................. 187
6.1.2 Experimental details..................................................................... 191
6.1.2.1 Material synthesis......................................................... 191
iii Table of contents
6. 1.2.2 Structure determination................................................ 193
6.1.2.3 The X-ray investigation on powder samples…………. 194
6.1.2.4 The differential scanning calorimetry (DSC)………… 194
6.1.2.5 Temperature dependence of the specific heat (C )…... 195 p
6.1.2.6 The magnetic susceptibility measurement.................... 195
6.1.2.7 Computational methods................................................ 196
6.1.3 Results and discussion................................................................. 196
6.1.3.1 Crystal Structure and Structure Comparison………… 196
6.1.3.2 Thermal analysis and magnetic characterization…….. 199
6.1.4 Theoretical investigation of the magnetic properties…………... 202
6.1.5 Conclusion................................................................................... 208
6.2. Reinvestigation of physical properties of the
Wigner crystallized chain cuprate Na Cu O ........................................................ 209 3 2 4
6.2.1 Experimental details..................................................................... 209
6.2.1.1 Material synthesis......................................................... 209
6.2.1.2 The X-ray investigation on powder samples…………. 211
6.2.1.3 Temperature dependence of the specific heat (C )…... 211 p
6.2.1.4 The magnetic susceptibility χ(T) .................................. 211
6.2.2 Results and discussion................................................................. 213
6.3 Crystal Structure and Raman Spectroscopic Study of K [CuO ][CO ]…….. 216 5 2 3
6.3.1 Introduction.................................................................................. 216
6.3.2 Experimental Section................................................................... 217
6.3.2.1 Synthesis....................................................................... 217
6.3.2.2 X-ray Analysis.............................................................. 218
6.3.2.3 Raman Spectroscopy and Chemical Analysis………... 220
6.3.3 Results and Discussion................................................................. 221
6.4 References....................................................................................................... 224




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