Ferroic Materials

Ferroics constitute a unique class of materials possessing either ferromagnetism, ferroelectricity or ferroelasticity. Two or more of these properties are found in so-called multiferroics. Our discovery of ferroelastic properties in LaCoO3-based materials in 2001 initiated our interest in ferroic materials. Since then ferroic materials have become the most important research field for the group, including advanced synthesis, ceramic processing and characterization of crystal structure, phase transitions and ferroic properties. Lead-free materials such as K0.5Na0.5NbO3 (KNN) and Bi0.5Na0.5TiO3 (BNT), ferroelectric tungsten bronzes such as Sr1-xBaxNb2O6 and multiferroic materials such as BiFeO3 and YMnO3 have been central to the research in the last decade. The main activities in the field of ferroic materials include:    

  • Development of lead-free ferroelectric materials based on BNT and KNN.
  • Preparation of thin films of ferroic perovskite materials by chemical solution deposition techniques.
  • Effect of strain in AMnO3 (A=Ca, Sr, Ba) and ferroic nano-composites
  • In situ studies of hydrothermal synthesis of KNN 
  • Investigating defect chemistry of manganites and ferrites.
  • Density functional theory (DFT) studies of point defects in multiferroics (BiFeO3,YMnO3)
  • Combined DFT and experimental investigation of ferroelectric tetragonal tungsten bronzes.
  • Development of biocompatible piezoelectric materials.
  • Conductivity and dielectric properties of ferroelectric domain walls.
  • Skyrmion dynamics.

Polarization and strain vs. electric field of <100>-, <111>-textured and non-textured Ba0.92Ca0.08TiO3 materials. The panels to the left show conventionally sintered samples while the panels to the right show spark plasma sintered materials.

Recent relevant publications:

S. H. Skjærvø, E. T. Wefring, S. K. Nesdal, N. H. Gaukås, G. H. Olsen, J. Glaum, T. Tybell and S. M. Selbach
Interstitial Oxygen as a Source of p-type Conductivity in Hexagonal Manganites
Nature Commun. 7 (2016) 13745.

A. Marthinsen, C. Faber, U. Aschauer, N. A. Spaldin and S. M. Selbach
Coupling and competition between ferroelectricity, magnetism, strain and oxygen vacancies in AMnO3 perovskites
MRS Commun. 6 (2016) 182-191 and arXiv:1606.05165

S. Manz, M. Matsubara, T. Lottermoser, J. Büchi, A. Iyama, T. Kimura, D. Meier and M. Fiebig
Reversible optical switching of antiferromagnetism in TbMnO3
Nature Photon. 10 (2016) 653-656.

S. Zhukow, J. Glaum, H. Kungl, E. Sapper, R. Dittmer, Y. A. Genenko and H. von Seggern
Fatigue effect on polarization switching dynamics in polycrystalline bulk ferroelectrics
J. Appl. Phys. 120 (2016) 064103.

A. Dussaux, P. Schoenherr, K. Koumpouras, J. Chico, K. Chang, L. Lorenzelli, N. Kanazawa, Y. Tokura, M. Garst, A. Bergman, C. L. Degen and D. Meier
Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe
Nature Commun. 7 (2016) 12430.

M. Acosta, L. A. Schmitt, C. Cazorla, A. Studer, A. Zintler, J. Glaum, H.-J. Kleebe, W. Donner, M. Hoffman, J. Rödel and M. Hinterstein
Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuth-based piezoceramics
Sci. Rep. 6 (2016) 28742. 

J. Glaum, M. Zakhozheva, M. Acosta, E. Aksel, H.-J. Kleebe, M. Hoffman and L. A. Schmitt
Influence of B-site Disorder on the Properties of Unpoled Bi1/2Na1/2TiO3-0.06Ba(Zr1-xTix)O3 Piezoceramics
J. Am. Ceram. Soc. 99 (2016) 2801-2808.

G. H. Olsen, U. Aschauer, N. A. Spaldin, S. M. Selbach and T. Grande
Origin of ferroelectric polarization in tetragonal tungsten-bronze-type oxides
Phys. Rev. B 93 (2016) 180101(R).

E. T. Wefring, F. H. Schader, K. G. Webber, M.-A. Einarsrud and T. Grande
Electrical conductivity and ferroelastic properties of Ti-substituted solid solutions (1-x)BiFeO3–xBi0.5K0.5TiO3
J. Eur. Ceram. Soc. 36 (2016) 497-506.

M. Lilienblum, T. Lottermoser, S. Mainz, S. M. Selbach, A. Cano and M. Fiebig
Ferroelectricity in the hexagonal manganites
Nature Phys. 11 (2015) 1070-1073.

G. H. Olsen, S. M. Selbach and T. Grande
On the energetics of cation ordering in tungsten-bronze-type oxides
Phys. Chem. Chem. Phys. 17 (2015) 30343-30351.

M. I. Morozov, M.-A. Einarsrud, J. R. Tolchard, P. T. Geiger, K. G. Webber, D. Damjanovic and T. Grande
In-situ structural investigations of ferroelasticity in soft and hard rhomohedral and tetragonal PZT
J. Appl. Phys. 118 (2015) 164104.

E. T. Wefring, M.-A. Einarsrud and T. Grande
Electrical conductivity and thermopower of (1-x)BiFeO3–xBi0.5K0.5TiO3 (x=0.1, 0.2) ceramics near the ferroelectric to paraelectric phase transition
Phys. Chem. Chem. Phys. 17 (2015) 9420-9428.

A. B. Haugen, F. Madaro, L.-P. Bjørkeng, T. Grande and M.-A. Einarsrud
Sintering of sub-micron K0.5Na0.5NbO3 powders fabricated by spray pyrolysis
J. Eur. Ceram. Soc. 35 (2015) 1449-1457.

A. B. Haugen, G. H. Olsen, F. Madaro, M. I. Morozov, G. Tutuncu, J. L. Jones, T. Grande and M.-A. Einarsrud
Piezoelectric K0.5Na0.5NbO3 Ceramics Textured Using Needlelike K0.5Na0.5NbO3 Templates
J. Am. Ceram. Soc. 97 (2014) 3818-3825.

A. B. Haugen, M. I. Morozov, J. L. Jones and M.-A. Einarsrud
Rayleigh analysis of dielectric properties in textured K0.5Na0.5NbO3 ceramics
J. Appl. Phys. 116 (2014) 214101.

A. B. Haugen, M. I. Morozov, M. Johnsson, T. Grande and M.-A. Einarsrud
Effect of crystallographic orientation in textured Ba0.92Ca0.08TiO3 piezoelectric ceramics
J. Appl. Phys. 116 (2014) 134102.

E. T. Wefring, M. I. Morozov, M.-A. Einarsrud and T. Grande
Dielectric and Piezoelectric Properties of Solid Solutions in the System (1-x) Bi0.5K0.5TiO3 – x Bi0.5Na0.5ZrO3
J. Am. Ceram. Soc. 97 (2014) 2928-2935.

M. I. Morozov, M.-A. Einarsrud and T. Grande
Control of conductivity and electric field induced strain in bulk Bi0.5K0.5TiO3–BiFeO3 ceramics
Appl. Phys. Lett. 104 (2014) 122905.

M.-A. Einarsrud and T. Grande
1D oxide nanostructures from chemical solutions (Tutorial review)
Chem. Soc. Rev. 43 (2014) 2187-2199. PDF

M. I. Morozov, M.-A. Einarsrud and T. Grande
Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3-BiFeO3 ceramics
J. Appl. Phys. 115 (2014) 044104.

About us

Contact persons:

Professor Mari-Ann Einarsrud
E-mail: mari-ann.einarsrud@ntnu.no
Phone: +47 73 59 40 02

Professor Tor Grande
E-mail: tor.grande@ntnu.no
Phone: +47 73 59 40 84

Professor Kjell Wiik
E-mail: kjell.wiik@ntnu.no
Phone: +47 73 59 40 82

Assoc. Prof. Hilde Lea Lein
E-mail: hilde.lea.lein@ntnu.no
Phone: +47 73 55 08 80

 Assoc. Prof. Fride Vullum-Bruer
Phone: +47 73 59 39 76

Assoc. Prof. Sverre M. Selbach
Phone: +47 73 59 40 99

Assoc. Prof. Maria Benelmekki
Phone: +47 73 59 40 05

Assoc. Prof. Dennis Meier
Phone: +47 73 59 40 47


Assoc. Prof. Sondre K. Schnell
Phone: +47 45 27 54 63

Visiting address:
Sem Sælandsvei 12

Postal address:
Inorganic Chemistry and Ceramics Research Group
att: Mari-Ann Einarsrud
Department of Materials Science and Engineering