The Grüneisen parameter determines the magnitude of the system dimensional change in response to its thermal energy variation. Differentiating the various contributions to the Grüneisen parameter is of great importance to clearly understand the thermal expansion mechanism of solids. In particular, the electronic Grüneisen parameter (γe) characterizes the electronic contribution to the thermal e...

An analytical model, validated by experiments and finite element simulations, is developed to study the thermal imaging of single-walled carbon nanotube (SWNT) devices by scanning Joule expansion microscopy (SJEM). A simple scaling law for thermal expansion at low frequencies, which only depends on two nondimensional geometric parameters, is established. Such a scaling law provides a simple way...

The paper presents two methods for measuring the dilatation resulting from thermal expansion. The contact based stylus measurement method and the contact less heterodyne laser interferometry have been compared to prove their effectiveness in measuring small dilatations. The paper presents shortly the application of both methods for measuring thermal expansion, and compares their applicability f...

The high thermoelectric figure of merit zT of Ba8Ga16Ge30 makes it one of the best n-type materials for thermoelectric power generation. Here, we describe the synthesis and characterization of a Czochralski pulled single crystal of Ba8Ga16Ge30 and polycrystalline disks. Measurements of the electrical conductivity, Hall effect, specific heat, coefficient of thermal expansion, thermal conductivit...

w w w. v i s h a y m g . c o m VMR-TC0513-0501 The thermal expansion coefficient is a very basic physical property which can be of considerable importance in mechanical and structural design applications of a material. Although there are many published tabulations of expansion coefficients for the common metals and standard alloys, the need occasionally arises to measure this propertay for a sp...

Metal organic framework-5 (MOF-5)was recently suggested to possess an exceptionally large negative thermal-expansion coefficient. Our direct experimental measurement of the thermal expansion of MOF-5 using neutron powder diffraction, in the temperature range of 4 to 600 K, shows that the linear thermalexpansion coefficient is ≈−16×10−6 K−1. To understand the origin of this large negative therma...