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Mica Sheets and Disks
The highest quality mica (V-1 or V-2) for AFM applications to the Medium Quality (V-4 to V-6) for replication and thin film deposition.
Introduction
EMS Mica Sheets offer a clean surface for EM applications, carbon filming and particle spraying, as well as for AFM applications. There are two types of mica: muscovite and phlogopite. Generally, one differs from the other by color (Muscovite is Ruby, Green or White; Phlogopite is Amber, Yellow, or Silver). The maximum operating temperature for Muscovite is about 500-600°C and for Phlogopite is about 800-900°C. Our line consists of High Quality Muscovite Mica. This mica peels off very thin up to 0.0001" uniform layers, exposing "virgin" mica upon splitting.
Characteristics:
Muscovite, potash type mica, sometimes known as granitic mica, is the best of all micas in dielectric strength, perfection of cleavage, and transparency.
It has the following chemical formula: H2KAI3(Si04)3.
Chemical Composition:
Silica: | 45.5% |
Alumina: | 37.5% |
Potash: | 12.0% |
Water: | 5.00% |
It has a vitreous luster and is colorless to gray, brown, pale green, violet, dark olive green, or rose red. It may be transparent to translucent. It has strong double refraction and is optically negative. It loses water of constitution at 600°C and is practically non-magnetic. It exhibits pleochrism, which is the property of varying in color when viewed from different angles.
RUBY muscovite is harder than green and has a pale brownish red color in thin sheets (0.020") or ruby red in thick plates (0.4"). Ruby mica can be split easily into films of 0.001" or thinner because it has such excellent cleavage. In other colors, this thinness can be obtained but at a considerable risk of cracking.
Physical Properties:
Hardness: Moh's scale: | 2.8 - 3.2 |
Shore's Test: | 80 - 150 |
Specific Gravity, g/cm3: | 2.6 - 3.2 |
Tensile Strength, kg/cm2: | ~ 1750 |
Compression Strength, kg/cm2: | 1900 - 2850 |
Refractive Index (air=1): | 1.56 - 1.60/61 |
Dielectric Strength @20°C in volt/mil: | 3,000 - 6,000 |
Maximum Thermal Resistance: | 625°C (1,157°F) |
Modulus of Elasticity, kgf/cm2E(-3): | 1400 - 2100 |
Optic Axial Angle: | 50° - 75° |
Coefficient of Expansion per °C: | Perpendicular to cleavage plane 9E(-4) - 36E(-4) |
Calcining Temperature | 700 - 800°C |
Thermal Conductivity: gm.cal/sec/cm2/°C/cm: | ~0.0013 |
Water of Constitution, %: | 4 - 5 |
Moisture Absorption: | Very low |
Apparent Electric Strength: | 120 - 200kV/mm |
Permittivity @ 15°C (60°F): | 6 - 7 |
Power Factor (loss Tangent) @15°C: | 0.0001 - 0.0004 |
Volume Resistively @25°C (77°F) 0hm.cm: | 4E(-15) - 2E(-17) |
Acid Reaction : | Affected by HF |
品牌：http://www.emsdiasum。。ｃｏｍ/microscopy/products/preparation/mica.aspx
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