Julian Bradley Walker
About
Julian Walker is an Associate Professor at the Department of Materials Science and Engineering in the Functional Materials and Materials Chemistry research group (FACET).
Julian is a materials scientist with expertise in the synthesis and characterization of inorganic, supramolecular and hybrid ionic molecular functional materials. In these systems the interplay of different external stimuli such as temperature, electric field, stress or magnetic field can be utilized to augment the material behavior, such as phase transition parameters, or for the purposes of electromechanical coupling and charge storage.
Core research areas:
- Engineering functional and mechanical properties of functional materials through compositions, synthesis, domain and microstructure engineering.
- Compositional design and engineering of hybrid molecular systems for functional applications as dielectrics, piezoelectrics, ferroelectrics, electrocalorics and thermal energy storage.
- Ionic plastic crystal systems as novel phase change and ferroic materials.
Background
- Julian obtained his PhD from the University of New South Wales, Australia in 2014, in the group of Prof. Nagarajan Valanoor.
- 2014-2016 he was a postdoctoral researcher at the Electronic Ceramics Department, Jozef Stefan Institute, Slovenia with Prof. Barbara Malic.
- 2016-2018 Julian joined the Materials Research Institute, Pennsylvania State University where he spent two and a half years in the group of Prof. Susan Trolier-McKinstry working with piezoelectric thin film application and innovation, with projects like the development of piezoelectric adjustable optics as a candidate technology for NASA's proposed Lynx telescope.
- 2018 He joined NTNU as a postdoctoral researcher working with hybrid materials.
- 2021 Julian was appointed Associate Professor.
Teaching
Julian is currently the course responsible and main lecturer for masters and undergraduate level courses at the Department of Materials Science and Engineering:
- TMT4145 Ceramic Engineering
- TMT4245 Functional Materials.
Honors/Awards
- Excellence in Reviewing: Scripta Materiala (2018), Journal of Materials Chemistry C (2018, 2019), Materials Horrizons (2022)
- Best Young Researcher award, Piezoresponse Force Microscopy and Nano-scale Phenomena in Polar Materials conference, 2014
- Australian Postgraduate Award - Industry, University of New South Wales, Australia, 2010-2013
Competencies
Publications
2022
-
Walker, Julian;
Marshall, Kenneth Paul;
Beceiro, Jorge Salgado;
Williamson, Benjamin;
Løndal, Nora Statle;
Castro-Garcia, Socorro.
(2022)
Mesophase Transitions in [(C2H5)4N][FeBrCl3] and [(CH3)4N][FeBrCl3] Ferroic Plastic Crystals.
Chemistry of Materials
Academic article
-
Nylund, Inger-Emma;
Løndal, Nora Statle;
Walker, Julian;
Vullum, Per Erik;
Einarsrud, Mari-Ann;
Grande, Tor.
(2022)
Cation Disorder in Ferroelectric Ba4M2Nb10O30 (M = Na, K, and Rb)Tetragonal Tungsten Bronzes.
Inorganic Chemistry
Academic article
2021
-
Denis-Rotella, Lyndsey M.;
Esteves, Giovanni;
Walker, Julian;
Zhou, Hanhan;
Jones, Jacob L.;
Trolier-Mckinstry, Susan.
(2021)
Residual Stress and Ferroelastic Domain
Reorientation in Declamped {001}
Pb(Zr0.3Ti0.7)O3 Films.
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Academic article
2020
-
Walker, Julian;
Scherrer, Simon Wolfgang;
Løndal, Nora Statle;
Grande, Tor;
Einarsrud, Mari-Ann.
(2020)
Electric field dependent polarization switching of tetramethylammonium bromotrichloroferrite(III) ferroelectric plastic crystals.
Applied Physics Letters
Academic article
-
Walker, Julian;
Mirjanic, Anja;
Sadl, Uros;
Condurache, Oana Andreea;
Bencan, Andreja;
Rojac, Tadej.
(2020)
Magnetic contributions in multiferroic gadolinium modified bismuth ferrite ceramics.
Scripta Materialia
Academic article
-
Liu, Lisha;
Rojac, Tadej;
Kimpton, Justin;
Walker, Julian;
Makarovic, Maja;
Li, Jing-Feng.
(2020)
Poling-induced inverse time-dependent microstrain mechanisms and post-poling relaxation in bismuth ferrite.
Applied Physics Letters
Academic article
-
Walker, Julian;
Miranti, Rany;
Skjærvø, Susanne Linn;
Rojac, Tadej;
Grande, Tor;
Einarsrud, Mari-Ann.
(2020)
Super-coercive electric field hysteresis in ferroelectric plastic crystal tetramethylammonium bromotrichloroferrate(III).
Journal of Materials Chemistry C
Academic article
2019
-
Ibn-Mohammed, Taofeeq;
Randall, Clive A;
Mustapha, Khameel B;
Guo, Jing;
Walker, Julian;
Berbano, Seth.
(2019)
Decarbonising ceramic manufacturing: A techno-economic analysis of energy efficient sintering technologies in the functional materials sector.
Journal of the European Ceramic Society
Academic article
-
Makarovic, M;
Bencan, A;
Walker, Julian;
Malic, B;
Rojac, T.
(2019)
Processing, piezoelectric and ferroelectric properties of (x)BiFeO3-(1-x)SrTiO3 ceramics.
Journal of the European Ceramic Society
Academic article
-
Cardoletti, Juliette;
Radetinac, Aldin;
Thiem, Daniel;
Walker, Julian;
Komissinskiy, Philipp;
Xu, Bai-Xiang.
(2019)
Modelling of the vertical deflection of ferroelectric bending tongues loaded at their free end.
AIP Advances
Academic article
-
Coleman, K;
Walker, Julian;
Beechem, Thomas E;
Trolier-Mckinstry, Susan E.
(2019)
Effect of stresses on the dielectric and piezoelectric properties of Pb(Zr0.52Ti0.48)O3 thin films.
Journal of Applied Physics
Academic article
Journal publications
-
Walker, Julian;
Marshall, Kenneth Paul;
Beceiro, Jorge Salgado;
Williamson, Benjamin;
Løndal, Nora Statle;
Castro-Garcia, Socorro.
(2022)
Mesophase Transitions in [(C2H5)4N][FeBrCl3] and [(CH3)4N][FeBrCl3] Ferroic Plastic Crystals.
Chemistry of Materials
Academic article
-
Nylund, Inger-Emma;
Løndal, Nora Statle;
Walker, Julian;
Vullum, Per Erik;
Einarsrud, Mari-Ann;
Grande, Tor.
(2022)
Cation Disorder in Ferroelectric Ba4M2Nb10O30 (M = Na, K, and Rb)Tetragonal Tungsten Bronzes.
Inorganic Chemistry
Academic article
-
Denis-Rotella, Lyndsey M.;
Esteves, Giovanni;
Walker, Julian;
Zhou, Hanhan;
Jones, Jacob L.;
Trolier-Mckinstry, Susan.
(2021)
Residual Stress and Ferroelastic Domain
Reorientation in Declamped {001}
Pb(Zr0.3Ti0.7)O3 Films.
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Academic article
-
Walker, Julian;
Scherrer, Simon Wolfgang;
Løndal, Nora Statle;
Grande, Tor;
Einarsrud, Mari-Ann.
(2020)
Electric field dependent polarization switching of tetramethylammonium bromotrichloroferrite(III) ferroelectric plastic crystals.
Applied Physics Letters
Academic article
-
Walker, Julian;
Mirjanic, Anja;
Sadl, Uros;
Condurache, Oana Andreea;
Bencan, Andreja;
Rojac, Tadej.
(2020)
Magnetic contributions in multiferroic gadolinium modified bismuth ferrite ceramics.
Scripta Materialia
Academic article
-
Liu, Lisha;
Rojac, Tadej;
Kimpton, Justin;
Walker, Julian;
Makarovic, Maja;
Li, Jing-Feng.
(2020)
Poling-induced inverse time-dependent microstrain mechanisms and post-poling relaxation in bismuth ferrite.
Applied Physics Letters
Academic article
-
Walker, Julian;
Miranti, Rany;
Skjærvø, Susanne Linn;
Rojac, Tadej;
Grande, Tor;
Einarsrud, Mari-Ann.
(2020)
Super-coercive electric field hysteresis in ferroelectric plastic crystal tetramethylammonium bromotrichloroferrate(III).
Journal of Materials Chemistry C
Academic article
-
Ibn-Mohammed, Taofeeq;
Randall, Clive A;
Mustapha, Khameel B;
Guo, Jing;
Walker, Julian;
Berbano, Seth.
(2019)
Decarbonising ceramic manufacturing: A techno-economic analysis of energy efficient sintering technologies in the functional materials sector.
Journal of the European Ceramic Society
Academic article
-
Makarovic, M;
Bencan, A;
Walker, Julian;
Malic, B;
Rojac, T.
(2019)
Processing, piezoelectric and ferroelectric properties of (x)BiFeO3-(1-x)SrTiO3 ceramics.
Journal of the European Ceramic Society
Academic article
-
Cardoletti, Juliette;
Radetinac, Aldin;
Thiem, Daniel;
Walker, Julian;
Komissinskiy, Philipp;
Xu, Bai-Xiang.
(2019)
Modelling of the vertical deflection of ferroelectric bending tongues loaded at their free end.
AIP Advances
Academic article
-
Coleman, K;
Walker, Julian;
Beechem, Thomas E;
Trolier-Mckinstry, Susan E.
(2019)
Effect of stresses on the dielectric and piezoelectric properties of Pb(Zr0.52Ti0.48)O3 thin films.
Journal of Applied Physics
Academic article
Teaching
Courses
Media
2021
-
Academic lectureNylund, Inger-Emma; Zeiger, Caren Regine; Peng, Ding; Walker, Julian; Vullum, Per Erik; Einarsrud, Mari-Ann. (2021) Structure determination of K2BiNb5O15 and Rb2BiNb5O15 by electron diffraction. NKS-FUM 2021 2021-11-01 - 2021-11-02
-
PosterZeiger, Caren Regine; Nylund, Inger-Emma; Peng, Ding; Vullum, Per Erik; Tsoutsouva, Maria; Walker, Julian. (2021) Synthesis and Characterisation of Lead-free Tetragonal Tungsten Bronzes A4Bi2Nb10O30 (A=K,Rb) . Norsk kjemisk selskap NKS-FUM meeting 2021 , Lillestrøm 2021-11-01 - 2021-11-02
-
PosterLøndal, Nora Statle; Tsoutsouva, Maria; Walker, Julian; Einarsrud, Mari-Ann; Grande, Tor. (2021) Synthesis and properties of Tetragonal Tungsten Bronze Ba4A12Nb10O30 (A1 = Na, K, Rb). Norsk kjemisk selskap NKS-FUM meeting 2021 , Lillestrøm 2021-11-01 - 2021-11-02
2020
-
Academic lectureMiranti, Rany; Småbråten, Didrik Rene; Marshall, Kenneth; Walker, Julian; Kioseoglou, Joseph; Selbach, Sverre Magnus. (2020) Defect chemistry in Hexagonal Boron Nitride films deposited by PLD. Department of Materials Science and Engineering, NTNU 7th National Meeting on Inorganic and Materials Chemistry , Trondheim Airport 2020-02-13 - 2020-02-14