4 PhD positions Magnetic Cooling

[AL]

POSITION ONE:
Ph.D. for modelling and development of permanent magnets for magnetic refrigeration

Do you want to help develop innovative and environmentally friendly refrigeration technologies for the future?

The Fuel Cells and Solid State Chemistry Department at Risø National Laboratory is seeking a Ph.D. student to model and develop permanent magnets for use in magnetic refrigeration.

When a magnetic material is placed in an external magnetic field, its temperature rises. This socalled magnetocaloric effect may be used in a refrigeration system where the active component is a magnetocaloric substance subjected to repeated magnetizations and demagnetizations.

You will be part of a group working at the international front line of room-temperature magnetic refrigeration. We have just received funding for a 4-year project with the aim of developing a workable prototype.
The project

It is crucial for the efficiency of a magnetic refrigeration system to have a high magnetic field available. For practical purposes it will have to be generated by a permanent magnet. The project aim is to design a magnetic array, consisting of segments with varying magnetization directions, such that a strong, homogenous field is generated. Factors such as materials and production prices and system volume will be considered. The optimal configuration will then be realised together with Sintex A/S, a Danish company specializing in permanent magnets.
Qualifications

* education as an engineer, chemist or physicist
* experience with modelling
* knowledge of magnetism
* ability to work independently, to plan and carry out complicated tasks, and to be a part of a large, dynamical group
* good communication skills in English, both written and spoken

We offer

We offer an exciting and challenging job in an international environment.

Good possibilities for professional and personal growth.
Terms of employment

The terms of employment will be in accordance with those of scientific staff at Risø National Laboratory. The position is for a fixed duration of 3 years.

Application

If you are interested, please send your application, marked ”04-07”, to:

Risø National Laboratory
Fuel Cells and Solid State Chemistry Department
Building 227
Att.: Dorthe Schubert Jensen
P.O. Box 49
DK-4000 Roskilde
Denmark

or by mail to dorthe.schubert.jensen@risoe.dk.

We must have your application by February 05, 2007.

Further information

For further information please contact senior scientist Nini Pryds, +45 4677 5752, nini.pryds@risoe.dk, or postdoc Christian Bahl, +45 4677 5491, christian.bahl@risoe.dk.

You may read more about Risø and the Fuel Cells and Solid State Chemistry Department at www.risoe.dk and www.risoe.dk/afd-abf.

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POSITION TWO
Ph.D. for development of materials for magnetic refrigeration

Do you want to help develop innovative and environmentally friendly refrigeration technologies for the future?

The Fuel Cells and Solid State Chemistry Department at Risø National Laboratory is seeking a Ph.D. student to develop advanced magnetic materials for use in magnetic refrigeration.

When a magnetic material is placed in an external magnetic field, its temperature rises. This socalled magnetocaloric effect may be used in a refrigeration system where the active component is a magnetocaloric substance subjected to repeated magnetizations and demagnetizations.

You will be part of a group working at the international front line of room-temperature magnetic refrigeration. We have just received funding for a 4-year project with the aim of developing a workable prototype.
The project

It is crucial for the effficiency of a magnetic refrigeration system to have materials with a high magnetocaloric effect at the temperatures where cooling is wanted. By tuning the composition and oxygen stoichiometry of certain ceramic materials, their magnetic transition temperature and magnetocaloric effect can be changed. In the project you will study the interplay between structural and magnetic properties and composition. The results obtained will be used to guide the materials development. A unique calorimeter, developed at Risø, and a new advanced magnetometer will play an important role in the investigations. This may be supplemented by scattering techniques for structural characterization.
Qualifications

* education as an engineer, chemist or physicist
* experience with materials characterization
* knowledge of solid state physics and magnetism
* ability to work independently, to plan and carry out complicated tasks, and to be a part of a large, dynamical group
* good communication skills in English, both written and spoken

We offer

We offer an exciting and challenging job in an international environment.

Good possibilities for professional and personal growth.
Terms of employment

The terms of employment will be in accordance with those of scientific staff at Risø National Laboratory. The position is for a fixed duration of 3 years.

Application

If you are interested, please send your application, marked ”05-07”, to:

Risø National Laboratory
Fuel Cells and Solid State Chemistry Department
Building 227
Att.: Dorthe Schubert Jensen
P.O. Box 49
DK-4000 Roskilde
Denmark

or by mail to dorthe.schubert.jensen@risoe.dk.

We must have your application by February 05, 2007.

Further information

For further information please contact senior scientist Luise Theil Kuhn, 4677 4712, luise.theil.kuhn@risoe.dk, or senior scientist Nini Pryds, +45 4677 5752, nini.pryds@risoe.dk.

You may read more about Risø and the Fuel Cells and Solid State Chemistry Department at www.risoe.dk and www.risoe.dk/afd-abf.

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POSITION THREE

Ph.D. for modelling of active magnetic regenerators for magnetic refrigeration

Department of Manufacturing Engineering and Management, DTU in collaboration with The Fuel Cells and Solid State Chemistry Department at Risø National Laboratory is seeking a Ph.D. student to model active magnetic regenerators for use in magnetic refrigeration.

When a magnetic material is placed in an external magnetic field, its temperature rises. This socalled magnetocaloric effect may be used in a refrigeration system where the active component is a magnetocaloric substance subjected to repeated magnetizations and demagnetizations.

You will be part of a group working at the international front line of room-temperature magnetic refrigeration. We have just received funding for a 4-year project with the aim of developing a workable prototype.
The project

You will be involved in developing an advanced multiphysics numerical model for simulating the active magnetic regenerator. Specifically, the model will address the coupled fluid flow and heat transfer phenomena which take place during the refrigeration process. Among others, the model is aimed at supporting the design of the regenerator unit, especially with respect to final geometrical layout. Moreover, this model will be an important part of realizing the overall model of the entire magnetic refrigerator system.
Qualifications

* education as an engineer (mechanical engineering/materials science) or physicist
* experience with modelling
* knowledge of heat transfer and fluid flow
* ability to work independently, to plan and carry out complicated tasks, and to be a part of a large, dynamical group
* good communication skills in English, both written and spoken

We offer

We offer an exciting and challenging job in an international environment.

Good possibilities for professional and personal growth.
Terms of employment

The terms of employment will be in accordance with those of scientific staff at Risø National Laboratory. The position is for a fixed duration of 3 years.

Application

If you are interested, please send your application, marked ”00-07”, to:

Risø National Laboratory
Fuel Cells and Solid State Chemistry Department
Building 227
Att.: Dorthe Schubert Jensen
P.O. Box 49
DK-4000 Roskilde
Denmark

or by mail to dorthe.schubert.jensen@risoe.dk.

We must have your application by February xx, 2007.

Further information

For further information please contact senior scientist Nini Pryds, +45 4677 5752, nini.pryds@risoe.dk, or professor Jesper Hattel, +45 4525 4710,

jh@ipl.dtu.dk,

You may read more about Risø and the Fuel Cells and Solid State Chemistry Department at www.risoe.dk and www.risoe.dk/afd-abf and DTU and Department of Manufacturing Engineering and Management at www.DTU.dk and www.IPL.DTU.dk

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POSITION FOUR

Ph.D. for synthesis of materials for magnetic refrigeration

Do you want to help develop innovative and environmentally friendly refrigeration technologies for the future?

The Fuel Cells and Solid State Chemistry Department at Risø National Laboratory is seeking a Ph.D. student to synthesize advanced magnetic materials for use in magnetic refrigeration.

When a magnetic material is placed in an external magnetic field, its temperature rises. This socalled magnetocaloric effect may be used in a refrigeration system where the active component is a magnetocaloric substance subjected to repeated magnetizations and demagnetizations.

You will be part of a group working at the international front line of room-temperature magnetic refrigeration. We have just received funding for a 4-year project with the aim of developing a workable prototype.
The project

It is crucial for the efficiency of a magnetic refrigeration system to have materials with a high magnetocaloric effect at the temperatures where cooling is wanted. In this project you will synthesize new ceramic materials exhibiting a high and tunable magnetocaloric effect near room temperature. The work will include a study of the interplay between powder processing routes, grain sizes, sintering properties and magnetic properties. This will be done both by varying manufacturing parameters and by doping of the materials.
Qualifications

* education as a chemist, engineer or physicist
* experience with inorganic synthesis and materials characterization
* knowledge of magnetism
* ability to work independently, to plan and carry out complicated tasks, and to be a part of a large, dynamical group
* good communication skills in English, both written and spoken

We offer

We offer an exciting and challenging job in an international environment.

Good possibilities for professional and personal growth.
Terms of employment

The terms of employment will be in accordance with those of scientific staff at Risø National Laboratory. The position is for a fixed duration of 3 years.

Application

If you are interested, please send your application, marked ”02-07”, to:

Risø National Laboratory
Fuel Cells and Solid State Chemistry Department
Building 227
Att.: Dorthe Schubert Jensen
P.O. Box 49
DK-4000 Roskilde
Denmark

or by mail to dorthe.schubert.jensen@risoe.dk.

We must have your application by February 05, 2007.

Further information

For further information please contact senior scientist Nini Pryds, +45 4677 5752, nini.pryds@risoe.dk, or senior scientist Mohan Menon, +45 4677 5852, mohan.menon@risoe.dk.

You may read more about Risø and the Fuel Cells and Solid State Chemistry Department at www.risoe.dk and www.risoe.dk/afd-abf.