Inside a Solid Conductor — Copper
The metallic bond built in 3D: a lattice of Cu⁺ cores held to their neighbours, with the sea of free electrons swimming in the gaps between them. The cores vibrate about fixed sites and never leave; the electrons race in every direction and get nowhere until a field adds a lean.
Como usar esta simulação
- Raise the temperature slider and watch the lattice vibration amplitude grow
- Drop it towards 80 K to see the cores settle almost still
- Follow one electron through the gaps between the vibrating cores
- Rotate the 3D lattice to see the staggered arrangement of the ion cores
O que observar
- The ion cores oscillate about fixed sites and never migrate through the lattice
- Vibration amplitude grows with temperature but rises more slowly than the temperature itself
- The electron sea fills the space between cores rather than orbiting any single atom
- Electrons move fast and randomly, so with no field there is no net transport
- Hotter cores present a bigger target, which is the seed of the rise in resistance
A física por trás
Each copper atom gives up its single outer electron to a shared sea, leaving a lattice of Cu⁺ cores bound by their attraction to that sea — the metallic bond. The cores are fixed to their sites and can only oscillate about them, with an amplitude that grows as the square root of the absolute temperature. The delocalised electrons belong to the metal as a whole rather than to any atom, which is exactly what makes copper conduct: the carriers are already free and everywhere before any field is applied.