Coefficient of Thermal Expansion

Thermal expansion coefficient of hydrogenated amorphous carbon

The coefficient of thermal expansion ~CTE! of hydrogenated amorphous carbon (a-C:H) was investigated as a function of the concentration of sp hybridization. The CTE, determined using the thermally induced bending technique, depends on the concentration of sp bonded carbon, increasing to the value of graphite as the sp concentration approaches 100%. By using a combination of the thermally induce...

On the Determination of Thermal Expansion Coefficient of Thermal Oxide

The accurate value of thermal expansion coefficient ( ) of thin film is an important thermal property in the design of microelectronic devices and microsystem. This research presents a microbridge buckling deformation caused by the residual stresses to determine the of thermal oxide (SiO2) film. The extraction of is supported through experimental means and finite element analysis (FEM) of the b...

The coefficient of thermal expansion of highly enriched 28

For the new definition of the SI-unit of mass based on a fundamental constant, a redetermination of Avogadro’s constant is the goal of an international collaboration of numerous national laboratories and universities. Since a relative uncertainty of about 2 × 10 –8 is aimed at, the macroscopic density, the isotopic composition and the volume of the unit cell of a silicon single crystal have to ...

The Elusive Determination of the Thermal Expansion Coefficient of Graphene

The estimation of temperature-dependent thermal expansion coefficient (TEC) of graphene is quite challenging. There exist significant disagreements within theoretical calculations and equally with the experimental estimates of this quantity, both with reference to the magnitude and sign of the TEC. The difficulty in the estimation broadly arises from the fact that not only can graphene expand o...

Quantum elasticity of graphene: Thermal expansion coefficient and specific heat