► Forschungsinteressen

Synthese, Struktur- und Eigenschaftscharakterisierung von intermetallischen Aluminiumverbindungen und Zintl-Phasen

  • Studien zum Elektronenübertrag in ternären intermetallischen Edelmetall-Aluminium Verbindungen der Alkali- und Erdalkalimetalle
    • mittels 27Al NMR-Spektroskopie - in Kooperation mit den Gruppen von Prof. Hellmut Eckert und Prof. Michael Hansen
    • mittels Röntgenphotoelektronenspektroskopie (XPS) - in Kooperation mit der Gruppe von Prof. Helmut Zacharias
    • mittels theoretischen Methoden (DFT) - in Kooperation mit den Gruppen von Prof. Boniface Fokwa und Prof. Samir Matar
  • Untersuchung der physikalischen Eigenschaften Seltenerdmetall-haltiger Aluminiumverbindungen:
    • Magnetismus
    • magnetokalorische Eigenschaften
    • spezifische Wärme
    • elektrische Leitfähigkeit
  • Mößbauer-spektroskopische Untersuchungen (121Sb & 151Eu) - in Kooperation mit der Gruppe von Prof. Rainer Pöttgen
  • Lösung und Verfeinerung modulierter Kristallstrukturen

DFG-Projekt: "Studien zur Bindungssituation und zum Elektronenübertrag in elektronenarmen intermetallischen Verbindungen"
https://gepris.dfg.de/gepris/projekt/441210509

 

► Mitarbeiter

Doktoranden

seit 08/2021

Stefan Engel, MSc.
Thema der Dissertation: "Studien zur Bindungssituation und zum Elektronenübertrag in elektronenarmen intermetallischen Verbindungen"

(DFG-Projekt: https://gepris.dfg.de/gepris/projekt/441210509)

[mehr...]

 
seit 05/2022

Elias Gießelmann, MSc.
Thema der Dissertation: "Strukturelle und spektroskopische Untersuchungen von (oxidierten) intermetallischen Aluminiumverbindungen der frühen Übergangsmetalle"

Gemeinsame Betreuung mit Prof. Guido Kickelbick

[mehr...]

 

► Publikationen

Buchkapitel

12

 

O. Janka:
"Intermetallic materials" in Comprehensive Inorganic Chemistry III
Elsevier, 2022
[DOI: 10.1016/B978-0-12-823144-9.00092-3]

11

 

S. Engel, O. Janka:
"Bulk Metallic Glasses" in Applied Inorganic Chemistry
De Gruyter, 2022 Chapter 2.11
[Link to Volume 1]   [Link to Volume 2]   [Link to Volume 3]

10

 

S. Engel, O. Janka:
"Shape Memory Alloys" in Applied Inorganic Chemistry
De Gruyter, 2022 Chapter 2.10
[Link to Volume 1]   [Link to Volume 2]   [Link to Volume 3]

9

 

O. Janka, M. Bertau, R. Pöttgen:
"Slags as materials resource" in Applied Inorganic Chemistry
De Gruyter, 2022 Chapter 6.4
[Link to Volume 1]   [Link to Volume 2]   [Link to Volume 3]

8

 

M. Buchner, O. Janka:
"Be and Be alloys" in Applied Inorganic Chemistry
De Gruyter, 2022 Chapter 2.7
[Link to Volume 1]   [Link to Volume 2]   [Link to Volume 3]

7

 

O. Janka:
"Metallic light-weight alloys – Al, Ti, Mg" in Applied Inorganic Chemistry
De Gruyter, 2022 Chapter 2.3
[Link to Volume 1]   [Link to Volume 2]   [Link to Volume 3]

6

 

O. Janka, S. M. Kauzlarich:
"Zintl Compounds" in Encyclopedia of Inorganic and Bioinorganic Chemistry
Wiley, 2021.
[DOI: 10.1002/9781119951438.eibc0244.pub3]

5

 

O. Janka, R. Pöttgen:
"Intermetallic compounds" in Rare Earth Chemistry
De Gruyter, 2020 Chapter 2.4, 163-176.
[DOI: 10.1515/9783110654929]

4

 

R. Pöttgen, O. Janka:
"High-Temperature Methods" in Handbook of Solid State Chemistry
Wiley-VCH, 2017Volume 2: Synthesis, Chapter 1, 1-21.
[DOI: 10.1002/9783527691036.hsscvol2003]

3

 

O. Janka, R. Pöttgen:
"Reactive Fluxes" in Handbook of Solid State Chemistry
Wiley-VCH, 2017Volume 2: Synthesis, Chapter 10, 275-286.
[DOI: 10.1002/9783527691036.hsscvol2012]

2

 

O. Janka, S. M. Kauzlarich:
"Zintl Compounds" in Encyclopedia of Inorganic and Bioinorganic Chemistry
Wiley, 2013, 1–14.
[DOI: 10.1002/9781119951438.eibc0244.pub2]

1

 

Th. Schleid, H. Müller-Bunz, O. Janka:
"Geo-Inspired Phosphors Based on Rare- Earth Metal(III) Fluorides with Complex Oxoanions: I. Fluoride Oxocarbonates and Oxosilicates", in Minerals as Advanced Materials II
Springer, 2012, 353–366.
[DOI: 10.1007/978-3-642-20018-2_33]

Übersichtsartikel

6

E. C. J. Gießelmann, R. Pöttgen, O. Janka:
Laves phases: superstructures induced by coloring and distortions
Z. Allg. Anorg. Chem. 2023, accepted.
[DOI: 10.1002/zaac.202300109]

5

R. Pöttgen, O. Janka:
CeCr2Al20-type intermetallics – Structure-property relationships
Rev. Inorg. Chem. 2023, accepted.

4

S. Engel, E. Gießelmann, R. Pöttgen, O. Janka:                                                                                                                                          
Trivalent Europium – A scarce case in intermetallics
Rev. Inorg. Chem. 2023, accepted.
[DOI: 10.1515/revic-2023-0003]

3

O. Janka, R. Pöttgen:
The Role of Beryllium in Alloys, Zintl Phases and Intermetallic Compounds
Z. Naturforsch. 2020, 75b, 421-439.
[DOI: 10.1515/znb-2019-0105]

2

 

O. Janka, O. Niehaus, R. Pöttgen, B. Chevalier:
Cerium Intermetallics with TiNiSi-Type Structure
Z. Naturforsch. 2016, 71b, 737-764.
[DOI: 10.1515/znb-2016-0101]

1

 

R. Pöttgen, O. Janka, B. Chevalier:
Cerium Intermetallics CeTX - Review III
Z. Naturforsch. 2016, 71b, 165-191.
[DOI: 10.1515/znb-2016-0013]

Artikel

2023

147

F. Hartmann, M. Bitsch, B.-J. Niebuur, M. Koch, T. Kraus, C. Dietz, R. W. Stark, C. R. Everett, P. Müller-Buschbaum, O. Janka, M. Gallei:
Self-Assembly of Polymer-Modified FePt Magnetic Nanoparticles and Block Copolymers
materials 2023, 16, 5503.
[DOI: 10.3390/ma16165503]

146

M. A. Mohamed, S. Arnold, O. Janka, A. Quade, J. Schmauch, V. Presser, G. Kickelbick:
Continuous wet chemical synthesis of Mo(C,N,O)x as anode materials for Li-ion batteries
J. Mater. Chem. A 2023, accepted.
[DOI: 10.1039/d3ta03340f]

145

T. Büttner, O. Janka, V. Huch, D. Dhara, A. Jana, D. Scheschkewitz:
Single-Source Precursors for the Chemical Vapor Deposition of Iron Germanides
Eur. J. Inorg. Chem. 2023, accepted.
[DOI: 10.1002/ejic.202300433]

144

A. Feuerstein, B. Boßmann, T. Rittner, R. Leiner, O. Janka, M. Gallei, A. Schäfer:
Polycobaltoceniumylmethylene – A Water-Soluble Polyelectrolyte Prepared by Ring-Opening Transmetalation Polymerization
ACS Macro Lett. 2023, 12, 1019-1024.
[DOI: 10.1021/acsmacrolett.3c00336]

143

E. C. J. Gießelmann, R. Pöttgen, O. Janka:
Laves phases: superstructures induced by coloring and distortions
Z. Allg. Anorg. Chem. 2023, e202300109.
[DOI: 10.1002/zaac.202300109]

142

E. C. J. Gießelmann, S. Engel, Israa El Saudi, L. Schumacher, M. Radzieowski, J. M. Gerdes, O. Janka:
On the RE2TiAl3 (RE = Y, Gd–Tm, Lu) series – the first aluminum representatives of the rhombohedral Mg2Ni3Si type structure
Solids 2023, 4, 166-180.
[DOI: 10.3390/solids4030011]

141

R. Pöttgen, O. Janka:
CeCr2Al20-type intermetallics – Structure-property relationships
Rev. Inorg. Chem. 2023, accepted.
[DOI: 10.1515/revic-2023-0012]

140

E. C. J. Gießelmann, M. Radzieowski, S. F. Matar, O. Janka:
Formation of the Sub-Oxide Sc4Au2O1–x and Drastically Negative 27Al NMR Shift in Sc2Al
Inorg. Chem. 2023, 62, 9602-9617.
[DOI: 10.1021/acs.inorgchem.3c01097]

139

J. Wiethölter , A. Koldemir , M. K. Reimann , T. Block , J. Kösters , O. Janka, R. Pöttgen:
Mössbauer-spectroscopic characterization of the stannides Sr2Pd2Sn and Eu2Pd2Sn
Z. Naturforsch. B 2023, accepted.
[DOI: 10.1515/znb-2023-0015]

138

S. Engel, E. Gießelmann, R. Pöttgen, O. Janka:                                                                                                                                          
Trivalent Europium – A scarce case in intermetallics
Rev. Inorg. Chem. 2023, accepted.
[DOI: 10.1515/revic-2023-0003]

137

E. C. J. Gießelmann, S. Engel, W. Kostusiak, Y. Zhang, P. Herbeck-Engel, G. Kickelbick, O. Janka:
Raman and NMR Spectroscopic and Theoretical Investigations of the Cubic Laves-Phases REAl2 (RE = Sc, Y, La, Yb, Lu)
Dalton Trans. 2023, 52, 3391-3402.
[DOI: 10.1039/D3DT00141E]

136

A. Michaely, O. Janka, E. C. J. Gießelmann, R. Haberkorn, H. T. A. Wiedemann, C. W. M. Kay, G. Kickelbick:
Black Titania and Niobia within Ten Minutes – Mechanochemical Reduction of Metal Oxides with Alkali Metal Hydrides
Chem. Eur. J. 2023, 29, e202300223.
[DOI: 10.1002/chem.202300223]

135

S. Engel, E. C. J. Gießelmann, L. E. Schank, G. Heymann, K. Brix, R. Kautenburger, H. P. Beck, O. Janka:
Theoretical and 27Al NMR Spectroscopic Investigations of Binary Intermetallic Alkaline-Earth Aluminides
Inorg. Chem. 2023, 62, 4260–4271.
[DOI: 10.1021/acs.inorgchem.2c04391]

134

S. Engel, N. Zaremba, R. S. Touzani, O. Janka:
Eu4Al13Pt9 – A Coloring Variant of the Ho4Ir13Ge9 Type Structure
Z. Naturforsch. 2023, 78b, 147-156.
[DOI: 10.1515/znb-2023-0300]

2022

133

M. A. Mohamed, S. Arnold, O. Janka, A. Quade, V. Presser, G. Kickelbick:
Self-activation of Inorganic-Organic Hybrids derived via Continuous Synthesis of Polyoxomolybdate and para-Phenylenediamine enables very High Lithium-Ion Storage Capacity
ChemSusChem 2022, 16, e202202213.
[DOI: 10.1002/cssc.202202213]

132

N. Zaremba, V. Pavlyuk, F. Stegemann, V. Hlukhyy, S. Engel, S. Klenner, R. Pöttgen, O. Janka:
MAl4Ir2 (M = Ca, Sr, Eu) – Superstructures of the KAu4In2 type
Monatsh. Chem. 2022, 154, 43–52.
[DOI: 10.1007/s00706-022-03005-8]

131

H. Hübner, B.-J. Niebuur, O. Janka, L. Gemmer, M. Koch, T. Kraus, G. Kickelbick, B. Stühn, M. Gallei:
Crystalline Carbosilane-Based Block Copolymers: Synthesis by Anionic Polymerization and Morphology Evaluation in the Bulk State
Macromol. Chem. Phys. 2022, 225, 2200178.
[DOI: 10.1002/macp.202200178]

130

J. Keuter, M. Dimitrova, O. Janka, A. Hepp, R. J. F. Berger, F. Lips:
An Anionic Amido-Substituted Seven-Vertex Siliconoid Cluster
Chem. Eur. J. 2022, 28, e202201473.
[DOI: 10.1002/chem.202201473]

129

S. Baur, K. Brix, A. Feuerstein, O. Janka, R. Kautenburger:
Retention of waste cocktail elements onto characterised calcium silicate hydrate (C–S–H) phases: A kinetic study under highly saline and hyperalkaline conditions
Appl. Geochem. 2022, 143, 105319.
[DOI: 10.1016/j.apgeochem.2022.105319]

128

 

J. P. Scheifers, J. Flores, O. Janka, R. Pöttgen,B. P.T. Fokwa:
Triangular Arrangement of Ferromagnetic Iron Chains in the High-TC Ferromagnet TiFe1−xOs2+xB2
Chem. Eur. J. 2022, 28, e202201058.
[DOI: 10.1002/chem.202201058]

127

 

S. Engel, J. Bönnighausen, F. Stegemann, R. S. Touzani, O. Janka:
SrAl5Pt3 and Sr2Al16Pt9 – two new strontium aluminum platinides
Z. Naturforsch B. 2022, 77, 367-379.
[DOI: 10.1515/znb-2022-0012]

126

 

M. Hämmer, F. Pielnhofer, O. Janka, H. Takahashi, P. Gross, R. Pöttgen, H. A. Höppe:
Polymorphism and Optical, Magnetic and Thermal Properties of the either Phyllo- or Inosilicate-analogous Borosulfate Cu[B2(SO4)4]
Dalton Trans. 2022, 51, 3104-3115.
[DOI: 10.1039/D1DT04090A]

2021

125

 

A. K. Boehm, S. Husmann, M. Besch, O. Janka, V. Presser, M. Gallei:
Porous Mixed-Metal Oxide Li-Ion Battery Electrodes by Shear-Induced Co-assembly of Precursors and Tailored Polymer Particles
ACS Appl. Mater. Interfaces 2021, 13, 61166-61179.

[DOI: 10.1021/acsami.1c19027]

 

124

 

W. Cao, S. Yin, M. Bitsch, S. Liang, M. Plank, M. Opel, M. A. Scheel, M. Gallei, O. Janka, M. Schwartzkopf, S. V. Roth, P. Müller-Buschbaum:
In Situ Study of FePt Nanoparticles-Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films
Adv. Funct. Mater. 2021, 32, 2107667.

[DOI: 10.1002/adfm.202107667]

 

123

 

E. Gießelmann, Rachid S. Touzani, B. Morgenstern, O. Janka:
Synthesis, Crystal and Electronic Structure of CaNi2Al8
Z. Naturforsch. 2021, 76b, 659-668.

[DOI: 10.1515/znb-2021-0105]

122

 

F. Stegemann, T. Block, S. Klenner, Y. Zhang, B. P. T. Fokwa, C. Doerenkamp, H. Eckert, O. Janka:
Structural, Physical, Theoretical and Spectroscopic Investigations of Mixed-Valent Eu2Ni8Si3 and its Structural anti-Type Sr2Pt3Al8
Eur. J. Inorg. Chem. 2021, 3832-3845.

[DOI: 10.1002/ejic.202100564]

121

 

l. Wang, K. Frisella, P. Srimuk, O. Janka, G. Kickelbick, V. Presser:
Electrochemical lithium recovery with lithium iron phosphate: What causes performance degradation and how can we improve the stability?
Sustain. Energy Fuels 2021, 5, 3124-3133.

[DOI: 10.1039/D1SE00450F]

120

 

S. Pohl, O. Janka, E. Füglein, G. Kickelbick:
Thermoplastic Silsesquioxane Hybrid Polymers with a Local Ladder-Type Structure
Macromolecules 2021, 54, 3873–3885.

[DOI: 10.1021/acs.macromol.1c00310]

119

 

E. Selb, T. Buttlar, O. Janka, M. Tribus, S. G. Ebbinghaus, G. Heymann:
Multianvil high-pressure/high-temperature synthesis and characterization of magnetoelectric HP-Co3TeO6
J. Mater. Chem. C 2021, 9, 5486–5496.

[DOI: 10.1039/D0TC05210H]

118

 

D. D. Zimmermann, O. Janka, C. Buyer, R. Niewa, Th. Schleid:
Nd5OF5Se4 and Sm5OF5Se4: New layered oxide fluoride selenides of the lanthanoids
Solid State Sci. 2021, 116, 106601.

[DOI: 10.1016/j.solidstatesciences.2021.106601]

117

 

P. Shankhari, O. Janka, R. Pöttgen, B. P. T. Fokwa:
Rare-Earth-free Magnets: Enhancing Magnetic Anisotropy and Spin Exchange Toward High-TC Hf2MIr5B2(M = Mn, Fe)
J. Am. Chem. Soc. 2021, 143, 4205–4212.

[DOI: 10.1021/jacs.0c10778]

116

 

E. M. Heppke, S. Klenner, O. Janka, R. Pöttgen, T. Bredow, M. Lerch:
Cu2ZnSbS4 – A thioantimonate(V) with remarkably strong covalent Sb–S bonding
Inorg. Chem. 2021, 60, 2730–2739.

[DOI: 10.1021/acs.inorgchem.0c03601]

115

 

M. Radzieowski, T. Block, J. Koppe, M. R. Hansen, R. Pöttgen, O. Janka:
(Pseudo)binary Antimonides: Insights on Local Ordering and Effective Charge Configurations from 121Sb MAS NMR and Mössbauer Spectroscopies
J. Phys. Chem. C, 2021, 125, 1454–1466.

[DOI: 10.1021/acs.jpcc.0c09650]

2020

114

 

P. Pues, F. Baur, S. Schwing, D. Rytz, R. Pöttgen, C. Paulsen, O. Janka, B. Rendenbach, D. Johrendt, T. Jüstel:
Temperature and time-dependent luminescence of single crystals of KTb3F10
J. Lumin, 2020, 227, 117523.

[DOI: 10.1016/j.jlumin.2020.117523]

113

 

L. Pasqualini, O. Janka, S. Olthof, H. Huppertz, K. Liedl, R. Pöttgen, M. Podewitz, J. Bruns:
Ni[B2(SO4)4] and Co[B2(SO4)4]: Unveiling systematic trends in phyllosilicate analogue borosulfates
Chem. Eur. J., 2020, 26, 17405-17415.

[DOI: 10.1002/chem.202002221]

112

 

C. Funk, O. Reckeweg, F. J. DiSalvo, A. Schulz, S. Klenner, R. Pöttgen, O. Janka, Th. Schleid:
A New Class of Mixed-Valent Europium Halide ortho-Oxoborates: Eu6X[BO3]4 (X = Cl, Br and I)
J. Alloys Compd., 2020, 844, 156038.

[DOI: 10.1016/j.jallcom.2020.156038]

111

 

M. Hämmer, O. Janka, J. Böddinghausen, S. Klenner, R. Pöttgen, H. A. Höppe:
On the Phosphors Na5M(WO4)4 (M = Y, La-Nd, Sm-Lu, Bi) - Crystal Structures, Thermal Decomposition, Optical and Magnetic Properties
Dalton Trans., 2020, 49, 8209-8225 .

[DOI: 10.1039/D0DT00782J]

110

 

F. Eustermann, M. Eilers-Rethwisch, M. K. Reimann, O. Janka:
Synthesis and magnetic properties of the extended RE4Pd9Al24 series (RE = Sc, Y, Ce–Nd, Sm, Gd–Lu)
Z. Naturforsch. B, 2020, 75, 633-641.

[DOI: 10.1515/znb-2020-0051]

109

 

F. Eustermann, M. Eilers-Rethwisch, M. K. Reimann, O. Janka:
Structural transition and antiferromagnetic ordering in the solid solution CePd1–xAuxAl (x = 0.1–0.9)
Z. Naturforsch. B, 2020, 75, 895-901.

[DOI: 10.1515/znb-2020-0025]

108

 

M. Radziewoski, S. Klenner, R.-D. Hoffmann, O. Janka:
Structure Solution of Incommensurately Modulated La6MnSb15
Z. Kristallogr., 2020, 235, 291-301.

[DOI: 10.1515/zkri-2020-0034]

107

 

F. Stegemann, Y. Zhang, B. P. T. Fokwa, O. Janka:
On the Formation of the Gd3Ru4Al12 versus the Y2Co3Ga9 Type Structure – M3Rh4Al12 (M = Ca, Eu) versus M2T3Al9 (M = Ca, Sr, Eu, Yb; T = Ir, Pt).
Dalton Trans., 2020, 49, 6398-6406.

[DOI: 10.1039/D0DT00521E]

106

 

M. Zoller, R. Bubnova, S. Filatov, Y. Biryukov, E. Haussühl, R. Pöttgen, O. Janka, S. Penner, C. Praty, H. Fitzek, J. Winkler, H. Huppertz:
Elucidating the physical properties of the molybdenum oxide Mo4O11 and its tantalum substituted variant Mo2Ta2O11
Z. Kristallogr., 2020, 235, 143-155.

[DOI: 10.1515/zkri-2019-0073]

105

 

M. Radzieowski, F. Stegemann, S. Klenner, O. Janka:
On the Divalent Character of the Eu Atoms in the Ternary Zintl Phases Eu5In2Pn6 and Eu3MAs3 (Pn = As-Bi; M = Al, Ga)
Mater. Chem. Front., 2020, 4, 1231-1248.
[DOI: 10.1039/C9QM00703B]

104

 

M. Radzieowski, F. Stegemann, O. Janka:
Magnetic Properties of the RE2Pt6X15 (RE = Y, La-Nd, Sm, Gd-Lu; X = Al, Ga) Series
Eur. J. Inorg. Chem., 2020, 1199-1210.
[DOI: 10.1002/ejic.201901332]

103

 

S. Engelbert, O. Janka, S. Klenner, R. Pöttgen:
Tin-rich Phases RE2Au3Sn6 with RE = La, Ce, Pr, Nd, Sm - Synthesis, Structure, Magnetic Properties, and 119Sn Mössbauer Spectra
Z. Anorg. Allg. Chem., 2020, 646, 1508-1516.
[DOI: 10.1002/zaac.201900329]

102

M. Radzieowski, F. Stegemann, J. Bönnighausen, O. Janka:
Physical and Magnetocaloric Properties of TbPdAl2 and the Ferromagnetic Solid Solution Tb1-xLuxPdAl2 (x = 0.1-0.9)
Inorg. Chem., 2020, 59, 1137-1144.
[DOI: 10.1021/acs.inorgchem.9b02753]

101

 

C. Paulsen, T. Block, C. Benndorf, O. Oeckler, J. Bönnighausen, O. Janka, R. Pöttgen:
Au4 squares and linear infinite cadmium chains as building units in the intermetallic phases REAu4Cd2 (RE = La-Nd, Sm) with YbAl4Mo2 type structure
Z. Naturforsch., 2020, 75b, 73-82.
[DOI: 10.1515/znb-2019-0153]

100

 

M. Witt, J. Bönnighausen, F. Eustermann, A. Savourat, J. Scheifers, B. P. T. Fokwa, C. Doerenkamp, H. Eckert, O. Janka:
Extending the Knowledge on the Quaternary Rare Earth Nickel Aluminum Germanides of the RENiAl4Ge2 Series (RE = Y, Sm, Gd-Tm, Lu) - Structural, Magnetic and NMR-Spectroscopic Investigations
Z. Naturforsch., 2020, 75b, 149-162.
[DOI: 10.1515/znb-2019-0176]

99

O. Janka, R. Pöttgen:
The Role of Beryllium in Alloys, Zintl Phases and Intermetallic Compounds
Z. Naturforsch., 2020, 75b, 421-439.
[DOI: 10.1515/znb-2019-0105]

Publikationen aus der Zeit vor der Forschung an der UdS finden sich auf der Seite von Oliver Janka.