What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic ? Justify your answer.
Metal ions of ferromagnetic substances are randomly oriented in normal condition and substances do not act as a magnet. But when metal ions are grouped together in small regions, called as domains, each domain acts as a tiny magnet and it produces a strong magnetic field. In such condition ferromagnetic substances act like a magnet. When the ordering of the domain in group persists even after removal of the magnetic field a ferromagnetic substance becomes a permanent magnet. While domains are grouped in parallel and anti – parallel direction but in unequal number in ferromagnetic compounds. Thus, ferromagnetic substances, such as Ni, Co, Fe would make better permanent magnets rather than ferromagnetic substances.
Rate this question :
Explain why does conductivity of germanium crystals increases on doping with gallium.Chemistry - Exemplar
Match the type of unit cell given in Column I with the features given in Column II.
An element crystallizes in a f.c.c. lattice with cell edge of 250 pm. Calculate the density if 300 g of this element contain atoms.Chemistry - Board Papers
The percentage of empty space in a body centred cubic arrangement is ________.Chemistry - Exemplar
In which pair most efficient packing is present?Chemistry - Exemplar
What type of stoichiometric defect is shown by?
(i) ZnS (ii) AgBrNCERT - Chemistry Part-I
Iodine molecules are held in the crystals lattice by ____________.Chemistry - Exemplar
How many lattice points are there in one unit cell of each of the following lattice?
Body-centredNCERT - Chemistry Part-I