What is the diffusion of copper?
The self-diffusion coefficient of copper has been determined by tracer techniques through the use of a precision grinder and a precision lathe. The temperature dependence over the range 685-1062°C is given by D=0.468exp(−47140RT) cm2/sec.
What is silicon diffusion?
Diffusion is the “smoothing out” that occurs in any situation where a high concentration of particles exists in one place and the particles can undergo random motion. The natural tendency is for particles to move towards regions of lower concentration. Diffusion of dopants in silicon. Page 2.
What is the diffusion constant when copper is dissolved in copper?
time caused by the dissolution of pure copper. A constant diffusion coefficient of 1.22×10−5 cm2 s−1 was used in the calculation.
What is the emitter push effect?
The emitter-push effect, i.e., the enhanced movement of the base-collector junction under an emitter, is a well known phenomenon. 1 The prevalent explanation is that the nonconservative motion of emitter-diffu- sion-induced dislocations generates vacancies, which supersaturate locally.
Is iron soluble in copper?
The solubility of iron in copper is given to logC=2.951−3357(1/T °K) wt% in the temperature range 1050–650 °C.
What factors affect the diffusion rate in solid metal crystals?
The diffusion rate in solid metal crystals is affected by five factors:
- Diffusion mechanism;
- Temperature of diffusion;
- Concentration of the diffusion species (concentration gradient);
- Type of crystal structure; (bcc > fcc)
- Type of crystal imperfections.
What are the 4 factors that affect the rate of diffusion?
Several factors determine the rate of diffusion of a solute including the mass of solute, the temperature of the environment, the solvent density, concentration, and solubility.
How do you calculate self diffusivity?
The self-diffusion coefficient is given by g · a2 times the number of jumps per sec that the diffusing particles make. Gm is the free enthalpy for a jump, i.e. the free enthalpy barrier that must be overcome between two identical positions in the lattice.
What is Fe Cu?
Iron—Copper Fe—Cu.
Does Copper diffuse in Silicon?
Recent studies dealing with copper in silicon have shown large disparities in diffusivity data. We show that copper, as a positively charged diffusing species, is susceptible to many possible reactions. In particular, it strongly reacts with acceptors and oxygen.
What is the charge of copper in Silicon?
Diffusion of copper in silicon Hall and Racette [1] and Gallagher [2] were the first to show that copper diffuses in silicon as a positively charged ion. Theoretical calculations of Estreicher et al. [3], as well as the analysis of Weber [4] confirmed the model of singly positively charged Cu i.
Can copper be quenched in Silicon?
Recent studies [8], [14] revealed that in contrast to the common belief, copper can be quenched at interstitial sites in the silicon lattice. As Cui and CuB pairs are unstable at room temperature, copper remains mobile and finds stable sinks within several hours after quench.
How does the concentration of interstitial copper change with increasing diffusion temperature?
If the copper concentration (determined by the equilibrium solubility at the diffusion temperature) was raised above this level, the concentration of interstitial copper, observed by TID, saturated and even decreased if the total copper concentration was further increased.