19/03/2019

PhD Thesis proposal: Lead free piezoelectric : exploration of the NaNbO3-KNbO3 system

This job offer has expired


  • ORGANISATION/COMPANY
    GREMAN - University of Tours
  • RESEARCH FIELD
    ChemistryInorganic chemistry
    PhysicsApplied physics
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    08/04/2019 23:00 - Europe/Brussels
  • LOCATION
    France › Blois
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    01/10/2019

Keywords: Lead free piezoelectric, Thin films, Sputtering, Ceramics, SPS sintering

 

 

  • Context and objectives:

 

Piezoelectric materials, which allow direct conversion of mechanical energy into electrical energy, are integrated in numerous technologies including transductors (for sonars, medical diagnostics, energy harvesting…), sensors and actuators. The performances of miniaturized devices are directly related to the properties of the piezoelectric materials deposited in form of thin films. European directives on hazardous substances (REACH and RoHS) currently impose finding alternative solutions to the most often used piezoelectric material in industry, PbZrxTi1-xO3 (PZT), containing 60% lead mass.

 

The solid solution K1-xNaxNbO3(KNN) represents a potential candidate (attractive electromechanical performances compared to PZT along with higher operating temperatures) with structural/physical properties that can be fine tuned by controlling composition.

 

This PhD thesis aims at exploring the NaNbO3-KNbO3 phase diagram in thin films, through the development of mutli-target magnetron co-sputtering process followed by systematic characterizations of the chemical, structural and physical properties of thin films. A comparative study with bulk ceramics on compositions of interest is also planned.

 

  • Environment and methods :

 

This thesis will be carried out at the GREMAN laboratory at Tours University (http://greman.univ-tours.fr/) in the pole “Synthesis of Materials” Blois, France. The PhD student will use the recent installation of a multi-target RF magnetron sputtering reactor. Various processes will be explored in order to tailor the stoichiometry and structure in thin films. Structural (XRD, Raman/IR Spectroscopies, FEG-SEM, AFM), chemical (EDX) and physical ((di/piézo/ferro)-electric measurements) characterizations will be made at GREMAN and CERTeM (http://certem.univ-tours.fr/) to correlate deposition conditions and thin film properties. Ceramic sintering will be carried out by Spark Plasma Sintering (SPS). Additional characterizations will be done in collaboration with THALES company.

 

Eligibility criteria

· Candidate profile :

 

Holds a Master's degree or an engineering degree in Physics, Chemistry or Materials Science. Motivated and dynamic student with strong capacities for experimental work, good level in English (written and oral) as well as strong writing skills. An internship experience in a research laboratory, especially in the field of thin films, will be appreciated.

 

The conditions for funding require that the doctoral student be a European Union or Swiss national.

 

Selection process

· Application procedure :

 

The following items are required (deadline: April 08, 2019 at midnight):

- Cover letter (maximum 1 page),

- Detailed CV,

- Copy of the ID card or passport,

- Official full list of courses and marks from your university: Bachelor’s and Master’s degree,

- Any other information to assess the applicant,

Offer Requirements

Skills/Qualifications

· Candidate profile :

 

Holds a Master's degree or an engineering degree in Physics, Chemistry or Materials Science. Motivated and dynamic student with strong capacities for experimental work, good level in English (written and oral) as well as strong writing skills. An internship experience in a research laboratory, especially in the field of thin films, will be appreciated.

 

Work location(s)
1 position(s) available at
GREMAN - University of Tours
France
Blois
41029
15, rue de la Chocolaterie - CS 32903

EURAXESS offer ID: 391275

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