University of Lagos, Nigeria , PHS 404, Solid State Physics

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Title:

PHS 404, Solid State Physics

Institution:

University of Lagos, Nigeria

Level:

Degree.

Description:

Crystal Structure of Solids: The general nature of solids. Symmetry of crystals. The concept of bond. Various crystal structures e.g. structures referable to cubix axes, hexagonal lattice.
Crystallographic notations. Determination of crystal structure.
Termal Properties of Crystal Lattice: Einstein's and Debye's frequency distributions. Mention of extensions of Debye's theory. Numerical values of characteristic temperature. The equation of state of a solid using the Einstein model, compressibility of solids at absolute zero; thermal expansion coefficients of solid; binding energy of metallic elements.

The Free Electron Theory of Metals: The classical Drude-Lorentz theory, electrical and thermal conduction, the Weidemann Franz relation. The Sommerfeld model for a metal; specific heat of the electrons, electrical and thermal conductivity.

Motion of electrons in periodic field: Block waves. Nearly free electron approximation. Energy bands fermienergy, effective mass of the electron, electronic density of states. Brillouin zones. Electrons and holes. Experimental study of band structure and comparison with the fee electron theory. Tight binding approximation. Basic solid types: Metals, Ionic crystal; covalent crystals, molecular crystals. Discuss their:

(i) electrical conductivity;
(ii) optical properties;
(iii) band structure;
(iv) cohesive energy.

Physical Properties of Semi-Conductors: Band structure of a pure semi-conductor at absolute zero; mention band structure of Si and Ge. Electronic impurity states in semi-conductors. Fermi energy in semi-conductors. The Fermi level in impurity semi-conductors. Contact potential difference.

Magnetism: Dia para. and ferromagnetism. Origin of permanent moments. Curie-Weiss Law. Pauli's theory of weak spin paramagnetism. Diamagnetism of the conduction electrons. Properties of the pure Ferromagnetic materials and origin of the ferromagnetic state, Weiss molecular field; theories of Heisenberg and Block. Antiferromagnetism and Ferromagnetism.

Nuclear Magnetic Resonance and Electron Spin Resonance:
Nature of the phenomena. Experimental methods for detecting resonance. Applications of NMR-ESR to solds.

Assessment is by assignments and examination.

Prerequisite: PHS 303.

Programmes for which this course is required or in which it can be included:
Bachelor of Science Honours in Education/Physics.

Languages:

English

Media and methods employed: Printed text, tV broadcast, radio broadcasts, face-to-face tutorials.

Printed correspondence texts prepared by institution, face-to-face tuition, radio, television via cable.

Administrative information:

This course is equivalent to 2 hours of instruction per week. It is a 1 semester course (15 weeks) and awards 2 units.

Classification:

070430 PHYSICS

Date:

01 September 1992 bb
Source: COSIT Brochure

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