- Materials
- Forms
-
Services
-
Services
-
-
Sectors
-
Supporting cutting edge research and development with advanced materials to your needs.
High performance materials for extreme conditions.
Innovative and lightweight materials with high mechanical properties and durability.
Materials used in chemical engineering from consumables to innovative solutions.
Advanced materials characterized by high electrical or insulation performance.
High quality materials for renewable energy.
Biocompatible and biodegradable materials to the highest standards.
High purity, biocompatible materials for high performance devices and applications.
High purity metals and alloys in various forms and crucibles suitable to your needs.
State of the art materials for the next generation of technologies.
High performance materials for extreme conditions.
Durable materials for corrosive environments.
Foils, disks or windows across a range of materials to facilitate your innovation.
Polymers, metal foils, and sustainable materials for your packaging needs.
Your requirements for unique products and attributes will be met across our 170,000+ product range and customization capabilities.
High-quality materials across branded products in various forms including rods, wires, and foils support space technology needs.
Highest quality materials to support your need for small-quantity specialist materials such as graphite and lithium compounds.
High purity materials to improve the reproducibility and reliability of your evaporation processes.
Academia Aerospace & Aeronautical Automotive Chemical Manufacturing Electronics and Bioelectronics Fuel Cells & Hydrogen Life Science and Biomaterials Storage & Batteries Vacuum Technology Mining and Metals Nanomaterials Nuclear Oil & Gas Optics Packaging Research & Labs Space Technology Medical Devices
-
-
Resources
-
Find out our latest news.
Read our latest insights, and opinions.
Discover our Innovation Discovered podcasts on innovation, products, interesting topics, and more.
Find out how we've worked with our partners
Our latest updates on what we are doing, find out more.
Find out more about us and the great roles we have available for talented individuals. Find out more.
Take a look at our global distributors.
Explore our FAQ resource to help answer your key questions.
Gain a clearer picture of the language used in scientific study
-
- About Us
Toggle Nav
Formula: Ge
Form: Single Crystal
Material: Germanium
CAS Number: 7440-56-4
Commodity: Metals
Purity:
99.999%
Germanium Single Crystal from Goodfellow is a high-purity semiconductor material grown into a monocrystalline form. With a diamond cubic crystal structure, it has a grayish metallic appearance and a lustrous surface. Germanium's electrical properties, including its moderate bandgap and high electron mobility, make it useful for semiconductor devices. This germanium single crystal is well-suited to applications like transistors, solar cells, and infrared optics. As part of Goodfellow's wide range of single crystal products, it enables research and development across electronics, photonics, and more.
Tolerances
Single Crystal
| Orientation | See Item | |
|---|---|---|
| Thickness | +2% / -1% | |
| Length | +2% / -1% |
Material Properties for Metals
Atomic Properties
| Element | Value |
|---|---|
| Atomic number | 32 |
| Crystal structure | Diamond |
| Electronic structure | Ar 3d¹⁰ 4s² 4p² |
| Valences shown | 2,4 |
| Atomic weight( amu ) | 72.59 |
| Thermal neutron absorption cross-section( Barns ) | 2.3 |
| Photo-electric work function( eV ) | 4.8 |
| Natural isotope distribution( Mass No./% ) | 72/ 27.4 |
| Natural isotope distribution( Mass No./% ) | 73/ 7.8 |
| Natural isotope distribution( Mass No./% ) | 76/ 7.8 |
| Natural isotope distribution( Mass No./% ) | 70/ 20.5 |
| Natural isotope distribution( Mass No./% ) | 74/ 36.5 |
| Atomic radius - Goldschmidt( nm ) | 0.139 |
| Ionisation potential( No./eV ) | 4/ 45.7 |
| Ionisation potential( No./eV ) | 3/ 34.22 |
| Ionisation potential( No./eV ) | 1/ 7.90 |
| Ionisation potential( No./eV ) | 5/ 93.5 |
| Ionisation potential( No./eV ) | 2/ 15.93 |
Mechanical Properties
| Element | Value |
|---|---|
| Hardness - Mohs | 6.25 |
| Material condition | Polycrystalline |
| Poisson's ratio | 0.32 |
| Bulk modulus( GPa ) | 73.9 |
| Tensile modulus( GPa ) | 79.9 |
Electrical Properties
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 46x10⁶@22@22°C |
| Thermal emf against Pt (cold 0C - hot 100C)( mV ) | 33.9 |
Physical Properties
| Element | Value |
|---|---|
| Boiling point( C ) | 2830 |
| Density( gcm⁻³ ) | 5.32@20°C |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 937.4 |
| Latent heat of evaporation( J g⁻¹ ) | 4516 |
| Latent heat of fusion( J g⁻¹ ) | 465 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 322@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 60.2@0-100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 5.75@0-100°C |
Other Customers Purchased
-
Germanium Rod Formula: Ge
Percentage Purity: 99.999%
Diameter: 2mm
Length: 50mm
Electrical Type: N-Type
Structure: Polycrystalline
CAS Number: 7440-56-4
UOM Code: 012-027-80
eachStarting at $307.51
Discounts applied for volume purchases -
Tungsten Square Single Crystal Formula: W
Percentage Purity: 99.99%
Thickness: 1mm
Size: 4x4mm
Orientation: -100
Orientation Accuracy: =< 1°
Polish: Polished
Surface Finish: =< 0.03µm Ra
CAS Number: 7440-33-7
UOM Code: 134-045-12
eachStarting at $1,394.99
Discounts applied for volume purchases -
Germanium Foil Formula: Ge
Percentage Purity: 99.999%
Thickness: 0.25mm
Length 1: 10mm
Length 2: 10mm
Electrical Type: N-Type
Structure: Polycrystalline
CAS Number: 7440-56-4
UOM Code: 006-336-64
eachStarting at $338.58
Discounts applied for volume purchases -
Tungsten Disk Single Crystal Formula: W
Percentage Purity: 99.99%
Thickness: 2mm
Diameter: 10mm
Orientation: -110
Orientation Accuracy: =< 1°
Polish: Polished
Surface Finish: =< 0.03µm Ra
CAS Number: 7440-33-7
UOM Code: 100-748-47
eachStarting at $1,156.08
Discounts applied for volume purchases -
Tungsten Top Hat Single Crystal Formula: W
Percentage Purity: 99.99%
Top Section Thickness: 1mm
Bottom Section Thickness: 1mm
Outside Diameter: 10mm
Inside Diameter: 8mm
Orientation: -110
Orientation Accuracy: Approx. 0.1°
Polish: Polished
Surface Finish: =< 0.03µm Ra
CAS Number: 7440-33-7
UOM Code: 128-551-93
eachStarting at $1,990.23
Discounts applied for volume purchases -
Titanium Dioxide Single Crystal Formula: TiO₂ 99.6%
Diameter: 8mm
Orientation: -111
Surface Finish: Polished On Both Sides
Thickness: 1mm
CAS Number: 13463-67-7
UOM Code: 976-671-28
eachStarting at $959.27
Discounts applied for volume purchases
