Two emerging keywords in ceramic community are sustainability and tailored functionality for advanced applications. This high-efficient-oriented and eco-friendly approach are to respond properly to the environmental regulations getting tougher and tougher. One of the biggest challenges on this quest lies in the fact that most useful ceramic materials contain nominally toxic elements that should be eventually removed. Our goal is to best-tailor the functionality of ceramic materials to meet the requirements for practical applications in accordance with the environmental appropriateness.

Research KeywordsLead-free piezoceramics, dielectric materials, electrocaloric materials

Research interestsHigh power piezoelectric applications, Large stroke actuator materials, high-efficiency solid-state cooling devices, in situ characterization of functional properties.

On going research Topics (selected) 1. Lead-free piezoceramics for actuator applications

Research Publications (selected)1. E. Sapper, A. Gassmann, L. Gjødvad, W. Jo, T. Granzow, and J. Rödel, “Cycling Stability of

Lead-Free BNT-8BT and BNT-6BT-3KNN Multilayer Actuators and Bulk Ceramics,” J. Eur. Ce-ram. Soc. 34 [3] (2014) 653-61.

2. C. Groh, D. J. Franzbach, W. Jo, K. G. Webber, J. Kling, L. A. Schmitt, H.-J. Kleebe, S.-J. Jeong, J.-S. Lee, J. Rödel, “Relaxor/Ferroelectric Composites: A Solution in the Quest for Practically Viable Lead-Free Incipient Piezoceramics,” Adv. Funct. Mater., 24 [3] (2013) 356-62.

3. K. Wang, F. Yao, W. Jo, D. Gobeljic, V. V. Shvartsman, D. C. Lupascu, J.-F. Li, and J. Rödel, “Temperature-Insensitive (K, Na)NbO3-Based Lead-Free Piezo Actuator Ceramics,” Adv. Funct. Mater. 23 [33] (2013) 4079-86.

4. R. Dittmer, W. Jo, J. Rödel, S. V. Kalinin, and N. Balke, “Nanoscale insight into lead-free BNT-BT-xKNN,” Adv. Funct. Mater. 22 [20] (2012) 4208-15.

5. W. Jo, R. Dittmer, M. Acosta, J. Zang, C. Groh, E. Sapper, K. Wang, and J. Rödel, “Giant elec-tric-field-induced strains in lead-free ceramics for actuator applications – status and per-spective,” J. Electroceram. 29 [1] (2012) 71-93.

6. W. Jo and J. Rödel, “Electric-Field-Induced Volume Change and Room Temperature Phase Stability of (Bi1/2Na1/2)TiO3-x mol% BaTiO3 Piezoceramics,” Appl. Phys. Lett. 99 [4] (2011) 042901, 3pp.

7. W. Jo, D.-Y. Kim, and N.-M. Hwang, "Effect of Interface Structure on the Microstructural Evo-lution of Ceramics," J. Am. Ceram. Soc. 89 [8] (2006) 2369-80.

Patents (selected) 1. Dielectric Ceramic Materials and Its Usage as Dielectric Components, German Patent, 10 2012 106 743.0, 04 JUL 2013. 2. Method of Fabricating Polycrystalline Ceramic for Thermoelectric Devices, U.S. patent: US 13/064,222, 3 NOV 2011. 3. Ceramic Material, Method for the Production of the Ceramic Material and Component Comprising the Ceramic Material, EU Patent, PCT/EP2009/055310, 30 APR 2009.

조욱 교수 Wook Jo

School of Materials Science and Engineering,Ulsan National Institute of Science and Tech-

nology (UNIST)Office : Engineering BLDG 1. Rm. 301-1

Lab : Engineering BLDG 1. Rm. 405 Tel: +82-52-217-2347

Fax: +82-52-217-2408E-mail: wookjo@unist.ac.kr

Curriculum Vitae• 2014~Present: Associate Professor (UNIST)• 2014~Present: International Director at Ko-

rean Institute of Electrical and Electronic Material Engineers

• 2013~Present: Associate Editor at Journal of the American Ceramic Society

• 2012~Present: Editor at Scientific Reports• 2012~Present: Editor at Journal of Electro-

ceramics• 2007~2013 : Technische Universität Darm-

stadt, Assistant Professor at Institute of Ma-terials Science

• 2005~2006 : Seoul National University, Re-search Associate at the School of Materials Science & Engineering

Academic Credential• 2005: Ph. D. Materials Science & Engineer-

ing, Seoul National University• 2003: M. S Materials Science & Engineering,

Seoul National University• 2001: B. S. Ceramic Engineering, Yonsei

University

Awards/Honors/Memberships • 1st & 2nd most cited articles in 2012 at Jour-

nal of Applied Physics• Most active referees at Physica Status Solidi

in 2010 & 2011• 2011: Research highlight at Applied Physics

Letters• 2006-Present: Registered at Marquis Who’s

Who in Science & Engineering• 2004: Best research awards, Seoul National

University• 2003: 1st place award at Ceramograph con-

test, American Ceramic Society

Research Groups• Emerging Functional Materials Research

Group

Sustainable Functional Ceramics Lab.

신소재공학부 /School of Materials Science and Engineering

PIEZOCERAMICS

generatorstransducers

actuatorssensors

ferroelectric

100 200 300200

300

400

500

K =

(R

/R)/

stress (MPa)

2000 V/cm 1000 V/cm

piezoelectricdielectric/high-current energy storage

Piezotronic

electrocaloric