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Characteristics of NdFeB Magnets

Neodymium Iron Boron (NdFeB) magnets, commonly referred to as neodymium magnets, are among the most powerful permanent magnets available today. Their composition includes the rare earth element neodymium, along with iron and boron. These magnets are known for their exceptional magnetic strength and are widely used across various industries. Here are some key characteristics of NdFeB magnets:

This section provides information on the physical properties of Neodymium Iron Boron (NdFeB) magnets.

As already discussed in previous sections, the NdFeB magnet has various grades:- each grade has its magnetic properties (relating to the strength of magnetic field output and resistance to demagnetization, maximum recommended operating temperature, and temperature coefficients).

The grades have other physical properties which are similar between the grades. Below is an overview of these properties:

Summary of Physical Properties of Neodymium Iron Boron, NdFeB, magnets

Characteristic Symbol Unit Value
Density D g/cc 7.5
Vickers Hardness Hv D.P.N 570
Compression Strength C.S N/mm2 780
Coefficient of Thermal Expansion C// 10-6/°C 3.4
  C^ 10-6/°C -4.8
Electrical Resistivity r µ Ω.cm 150
Temperature Coefficient of Resistivity a 10-4/°C 2
Electrical Conductivity s 106S/m 0.667
Thermal Conductivity  k kCal/(m.h.°C) 7.7
Specific Heat Capacity  c kCal/(kg.°C) 0.12
Tensile Strength σUTS, or SU kg/mm2 8
Young’s Modulus  l / E 1011N/m2 1.6
Flexural Strength  b 10-12m2/N 9.8
Compressibility s 10-12m2/N 9.8
Rigidity  E.I N/m2 0.64
Poisson’s Ratio n   0.24
Curie Temperature Tc °C 310

Structural use of Neodymium Iron Boron, NdFeB, magnets
There is a risk of chipping or breaking the magnets because all magnets are inherently brittle. The Neo magnets are less brittle than SmCo. It is advised to not put magnets in conditions of mechanical stress e.g. in load-bearing situations.

How to test real silver using neodymium magnets:


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