Specific heat capacity (cp), thermal conductivity (λ), and thermal diffusivity (a) coefficients are measured for spinel ferrite system prepared according to the following composition: Ni1.67−xZnxFeSb0.33O4 where x = 0.00, 0.33, and 0.67. The specific heat capacity measurements indicate the presence of a magnetic phase transition from ferrimagnetic to paramagnetic. The Curie temperature decreases as the concentration of Zn ions increases. Below and above the magnetic transition region cp obey's Debye theory of specific heat. For the thermal conductivity coefficient, it is found that the main mechanism of heat transfer is due to phonons in the region below and above the magnetic phase transition, while in the magnetic transition the main mechanism is due to both, phonons and magnons. The role of electrons and phonons is negligible in the measured temperature range.

The bulk copolymerization of methyl methacrylate with copper acrylate was carried out using benzoyl peroxide as initiator at 60°C. The density and hardness of the obtained transparent solid copolymer samples were investigated. The pattern of the chemical reactions is discussed. The monomer reactivity ratios were determined. The obtained samples were found to be random copolymers. The electrical conductivity of the obtained samples increases with the increase of Cu‐acrylate content, while the activation energy as well as the glass transition temperature decrease.

Thin lead films (Pb) of thickness ranging from 21.6 to 245 nm are deposited onto crystalline mica substrates under a pressure of 1.33 × 10−3 Pa. Using ellipsometery the real (ε1) and imaginary (ε2) parts of dielectric constant and energy loss function, −Im (ε)−1and −Im(ε + 1)−1 are calculat‐ed. The low energy peaks are interpreted in terms of parallel band transition, while the high‐energy peaks are interpreted by surface plasmons oscillations. Crystal size of films is obtained by X‐ray diffraction. It is found that the crystal size increases by increasing film thickness.

The resistivity of thin lead films is measured as a function of film thickness a t different temperatures. The films are deposited onto crystalline mica substrates with deposition rates of 1.05 nm/s. The substrates are maintained a t room temperature during deposition, while the resistivity is measured at different temperatures. The mean free path lo, bulk resistivity eo, thermal coefficient of resistance TCR, activation energy of conduction electrons AE, concentration of conduction electrons nit and their mobility y are estimated and correlated with the polycrystalline nature of lead films as well as their morphological characteristics.Es wird der Widerstand dunner Bleischichten in Abhiingigkeit von der Schichtdicke bei verschiedenen Temperaturen gemessen. Die Schichten werden auf kristalline Glimmersubstrate mit Abscheidungsraten von 1,05 nm/s aufgebracht. Die Substrate werden wiihrend der Abscheidung bei Zimmertemperatur gehalten, wahrend der Widerstand bei verschiedenen Temperaturen gemessen wird. Die mittlere freie Weglange lo, der Volumenwiderstand eo, der thermische Widerstandskoeffizient TCR, die Aktivierungsenergie der Leitungselektronen AE, die Konzentration der Leitungselektronen ni und ihre Beweglichkeit y werden bestimmt und sowohl mit der polykristallinen Natur der Bleischichten als auch mit ihren morphologischen Charakteristiken korreliert.