MGML

Materials Growth & Measurement Laboratory

Instruments & Technology

MATERIALS GROWTH AND CHARACTERIZATION LABORATORY

 
Furnaces for sample growth and treatment

 

Induction furnace for Bridgman method

CIMG2399 
  • Dynamic vacuum chamber (10-6 mbar), growth speed 0.001 - 30 mm/h,
  • Sample can be sealed in Mo, Ta or other metallic tube in arc furnace (argon atmosphere) or in fused silica (Ar, vacuum)
  • Maximum temperature ~ 2000 °C 

Resistive furnace for Bridgman method

 
  • Maximum temperature 1450 °C, growth speed

Optical floating zone furnace (Crystal Systems Corp. Japan)

00081
00071

 

  • Four ellipsoidal mirrors hold the same focus point (4 halogen lamps up to 1000 W each) in common while the sample bar can be melt under uniform temperature profile.
  • Atmosphere (0-10 bar): Ar, N2, O2, air
  • High vacuum option (10-6 mbar) suitable for growth of metallic samples.

3-arc furnace for modified-Czochralski method

CIMG2402CIMG0858
  • 3-arc furnace for Czochralski growth, growth speed
 

Resistive furnace for slow pulling single crystals from metallic solutions

RF
lab0001

 

Arc furnace for melting samples (button-shape, rods)

monoarch
  • Arc melting in watter cooled Cu crucibles of different shapes under 6N argon atmosphere

Multipurpose Laboratory furnaces, superkanthal furnace

CIMG2424
  • Various furnaces up to 1300 °C, a superkanthal furnace up to 1800 °C.
  • All furnaces are equipped by Programmable controller CLARE (one furnace devoted for potentially dangerous volatile substances is placed in a safety fume hood).

Splat cooling system

Splat cooling system
  • Arc-melted sample (droplet) is splat by water-cooled copper disks.

Multipurpose induction furnace – horizontal geometry

 
  • Sample can be melted in dynamical vacuum (10-6 mbar), button-shape or rod.

Cylindrical furnace with 2-heating segments

 
  • Furnace for vapor transport growth

 

Solid State Electrotransport (SSE)

0012
  • is used to refine pure elements (Rare earth metals and uranium) as well as single crystals of intermetallic compounds.
  • Made by Vakuum Praha.
  • The SSE technique involves passing a electrical current (up to 400 A) through a metallic rod held between two electrodes.
  • The impurities migrate under the influence of electric filed towards one end of the sample - the purity of the central part of the sample is increased.
  • To prevent the sample contamination (oxidation) the experiment is held under UHV conditions

 

Characterization techniques

 

Laue diffractometer PhotonicScience

CIMG2643
  • Goniometers compactible with wire saw for cutting samples in desired orientation

Powder diffractometer Bruker D8 Advanced

bruker
  • theta-2theta goniometer,
  • Cu X-ray tube, 
  • Sol X detector,
  • software: XRcommander, EVA

Low-temperature diffractometer

ltd

LT Diffractometer - D500-HR-4K

  • System components
  • Goniometer
  • Detector
  • Cryostat assembly (see bellow)
  • Control system
  • Safety precautions
  • Attocube positioner
ltd holder

Cryostat assembly – 101J Cryocooler (ColdEdge)

  • 4.25 K (0.28 W) – 325 K
  • > 180o
  • capton window for x-rays pumping station with turbomolecular drag and diaphragm (or rotary vane) pumps
  • assembly to mount attocube positioner (for epitaxial thin films applications)
  • ethernet (TCP) control

Scanning electron microscope MIRA3 FEG

 
  • SE, BSE detectors,in-beam SE and BSE detectors.
  • EDS detector Bruker Flash for composition analysis, Draw-beam SW for electron beam lithography. 

SETSYS Evolution TGA-DTA/DSC SETARAM

cimg2441dsc

setsys tga cruciblessetsys rods2

Thermal analysis - DSC, DTA, TGA (SETSYS Evolution TGA-DTA/DSC SETARAM).
We use DTA, DSC and TG primarily for study of phase transformations, for determination of the fusion heat and the specific heat capacity.
Definition of thermal analysis - TA: Group of physical chemical methods which deal with studying materials and processes under conditions of programmed changing's of the surrounding temperature.
- DTA = Differential Thermal Analysis -signal is temperature (time) dependence of the temperature difference between sample and reference
- DSC = Differential Scanning Calorimetry – measures temperature (time) dependence of the heat energy that is consumed by the sample, the measurement of thermal capacity is possible.
- TGA = Thermogravimetric Analysis – measures the sample mass versus T with high accuracy

 

Setsys Evolution DTA DSC TGA TMA
      balance 35g /100g  
Temperature range of the module (C°) ambient to 2400 ambient to 1600 ambient to 2400 ambient to 2400
Crucible volume (µl) 30/100 80/100 50/3000 n/a
Max. size of the sample (mm) n/a n/a L:20 Ø 14 L:20 Ø 10
Resolution 0.4 µW 1 µW 0.002 µg / 0.02 µg 0.2 nm
Noise RMS 20 µW 20 µW 0.03 µg/0.3 µg 5 nm
Specific noise RMS 0.20 µW/µl 0.20 µW/µl 0.02 µg/0.2 µg/ml 0.25.10-6
Measuring range n/a n/a ±200 mg / ±2 g ±2 mm

Dilatometer - Netzsch Dil 402C

cimg2440

When it comes to determination of the linear thermal expansion in solids, liquids, powders and pastes as well as ceramic fibers, the DIL 402 C vacuum-tight pushrod dilatometer leaves no measurement problem unsolved. The perfect design of the Invar measurement system with its high-resolution displacement transducer and comprehensive thermostatic control offers the highest degree of accuracy, reproducibility and long-term stability for application temperatures up to 2000°C.
The horizontal design of the dilatometer with motorized pushrod and easy to move furnace make it simple to place samples on the special sample supports in the recess of the tube-type sample carrier, even with less than ideal sample geometries. A thermocouple in direct proximity to the sample yields reproducible temperature measurement. This also allows use of the c-DTA® Software for calculation of endothermic and exothermic effects in the sample as well as determination of all the characteristic expansion values.

DIL 402 C - Technical Specifications (subject to change)

Temperature range: -180°C to 500°C, RT to 1000°C, RT to 1600°C, RT to 2000°C
(4 exchangeable furnace types)
Heating and cooling rates: 0.01 K/min to 50 K/min (dependent on furnace)
Sample holder:
fused silica <1000°C
Al2O3 <1700°C
graphite 2000°C
Measuring ranges: 500/5000 µm
Sample length: max. 50 mm
Sample diameter: max. 12 mm (optional 19 mm)
Δl resolution: 0.125 nm / 1.25 nm
Atmospheres: inert, oxidizing, reducing, static and dynamic
Gas flow meter and valve for purge gas (optional)
c-DTA® for the calculated DTA-signal from dilatometer measurements, ideal for temperature calibration (optional)
Highly vacuum-tight up to 10-4 mbar (10-2 Pa)
Coupling to QMS 403 D Aëolos® over a heatable adapter at the exit of the furnace
Extension with unique OTS® system (option)

Applications:

Alumina Green Body — Sintering
Glass Ceramic Zerodur — Thermal Expansion
Iron — Thermal Expansion
Polystyrene (PS)
Silicon Nitride — Thermal Expansion 

Atomic force microscopy

 

Bruker Multimode, Bruker Edge

Options: contact mode, tapping mode, PeakForce Tapping™ ScanAsyst® PeakForce QNM® (Quantitative Nanomechanical Property Mapping) PeakForce TUNA™  PeakForce KPFM™, MFM, EFM, AFM in liquids


 

Supporting equipment

 

The vacuum unit and the Glass-work station

lab
  • Sealing samples in Simax (Pyrex-like) glass and fused silica.
  • 6N argon,
  • vacuum ~ 10-6 mbar,  
  • baking out (up to 300°C) under dynamic vacuum

Centrifuge

centrifuge 2

 

Glovebox with 6N argon atmosphere

Glowbox

Hydraulic press

Press in Karlov  Press in Troja

Spin-coater POLOS™

spin coater

Saws & polishers

CIMG2407
  • Spark erosion saw (compactible with Laue goniometers) - left on the picture

  • 2x Wire saw (South Bay Technology, 810CE, compactible with Laue goniometers) - right on the picture
 0048
  • Diamond disc saw (Buehler IsoMet 1000)
 Polisher Grinder  
  • Grinder-polisher (Buehler)
 

Optical microscopes

Optical Microscopes

 

Nanomanipulator system (SmarAct)

nanomanipulator
  • for spot-weld contacting very small samples
MGCL - Contact

Materials Growth and Characteriazation Labotary (MGCL-MGML)
Charles University, Fac. of Math. and Phys, DCMP 
Ke Karlovu 5
121 16 Prague 2

The Czech Republic

Contact Person: Klára This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: +420 95155 1482

 

MGCL Ke Karlovu 5