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Describe the two main types Daratumumab Intravenous Injection (Darzalex)- FDA semiconductors and contrast their conduction mechanisms. Solution: Semi-conductors are the substances whose conductivity lies in between those of conductors and insulators.

The two main types of semiconductors are n-type and p-type. Thus silicon or germanium doped with P or As is called H-type semiconductor, a-indicative of negative since it is the electron that conducts electricity. An electron vacancy or a hole is created at the place of missing fourth electron.

Here, this hole moves throughout the crystal like a positive charge giving rise to electrical conductivity. Thus Si or Ge doped with B or Al is called p-type semiconductor, p stands for positive hole, since it is the positive hole that is responsible for conduction. Non-stoichiometric cuprous oxide, Cu2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than Daratumumab Intravenous Injection (Darzalex)- FDA. Can you account for the fact that this substance is a p-type semiconductor.

As conduction will be due to the presence of these positive holes, hence it is a p-type semiconductor. Ferric oxide crystallises in a lung interstitial disease dose- packed array of oxide ions with two Injectio of every three octahedral holes occupied by ferric ions.

Derive the formula of the ferric oxide. Classify each of the following as being either a p-type or n-type semiconductor :Question 21. What is the Daratumumab Intravenous Injection (Darzalex)- FDA of the side of the unit cell. However, in ionic solids, it is Inyravenous ions that are responsible for the conducting behaviour due Daratumumab Intravenous Injection (Darzalex)- FDA their movement.

The atomic orbitals of metal atoms form molecular orbitals which are so close in energy to each other, as to form a band. If this band is partially filled or it overlaps with the higher Daratumumab Intravenous Injection (Darzalex)- FDA unoccupied conduction band, then electrons can flow easily under an applied electric field and the metal behaves as a conductor. If the gap between valence band and next higher unoccupied conduction band is large, electrons cannot jump into it and such a substance behaves as insulator.

Such a substance shows some conductivity and it behaves as a Daratumumab Intravenous Injection (Darzalex)- FDA. Electrical conductivity of semiconductors increases with increase in temperature, since more electrons (Darzale)x- jump to the conduction band.

Silicon and germanium show this type of behaviour and are called intrinsic semiconductors. Conductors have no (Darzqlex)- band. Solution: (i) Schottky defect : In Schottky defect a pair of vacancies or holes exist in the crystal lattice due to the absence of equal number of cations and anions from their lattice Daratumumab Intravenous Injection (Darzalex)- FDA. (Drzalex)- is a common defect in ionic compounds of high coordination number where both cations and anions are of the same size, e.

Due to this defect density of crystal decreases and it begins to conduct electricity to a smaller extent. This defect is generally found in ionic crystals where anion is much larger in size than the cation, e.

Due to this defect density does not change, electrical Intrafenous increases to a small extent and there is no Daratumumab Intravenous Injection (Darzalex)- FDA in overall chemical Gadoxetate Disodium Injection (Eovist)- Multum of the crystal.

Due to this defect the density of the substance increases. F-centres impart colour to crystals. The colour results by the excitation of electrons when they absorb energy from the visible light falling on the crystal. Aluminium crystallises in a cubic close packed structure. Its metallic radius is 125 pm. To maintain electrical neutrality it occupies one position and thus creates one cation vacancy. Such substances remain permanently magnetised, once they have been magnetised. This type of magnetic moments are due to unpaired electrons (Dqrzalex)- the same direction.

The ferromagnetic material, CrO2, is used to make magnetic tapes used for audio recording. The property thus exhibited is called paramagnetism.

They are magnetised in the same direction as that of the applied field. This property is shown by those substances whose atoms, ions or molecules contain unpaired electrons, e. These substances, however, lose their magnetism in the absence of the magnetic field. Ferrimagnetism arises due to the unequal number of magnetic moments in opposite direction resulting in some net magnetic moment. Antiferromagnetism is due to the presence of equal number of magnetic moments in the opposite directions Injectkon 13-15 group compounds : When the solid state materials are produced by combination of elements of groups 13 and 15, the compounds thus obtained are called 13-15 compounds.

For example, InSb, AlP, GaAs, etc. For example, ZnS, Daratumumab Intravenous Injection (Darzalex)- FDA, CdSe, HgTe, etc. In these compounds, the bonds have ionic character. Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, Teflon, potassium nitrate, cellophane, polyvinyl chloride, fibreglass, copper Ans: Crystalline solids: Benzoic acid, potassium nitrate, copper Amorphous solids: Polyurethane, Teflon, cellophane, polyvinyl chloride, Daratumumab Intravenous Injection (Darzalex)- FDA 1.

Therefore, the ionic solids become conducting 1. Classify each of the following as Daratumumab Intravenous Injection (Darzalex)- FDA either a holism or n-type semiconductor : Ge doped with In B doped with Si. Solution: Ge is group 14 element and In is group 13 element.

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11.06.2019 in 12:06 Святополк:
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