22. What is the temperature coefficient
Temperature coefficient: the Br, Hcj, and (BH)max will keep decreasing when the temperature keep rising.
Br temperature coefficient: αBr : -0.09~-0.128%/℃
Hcj temperature coefficient: βHcj : -0.45~-0.8%/℃
αBr=(Br20℃-Br T℃) / （(T-20)*Br20℃)
βHcj=(Hcj20℃-HcjT℃) / （(T-20)*Hcj20℃ )
E.g. suppose a the αBr = -0.10%/℃ ， βHcj = -0.5%/℃
At 20℃, Br is 12KGs Hcj is 20KOe
What is the Br and Hcj at 120℃？
Br120℃ = Br20℃+αBr.(T120-T20) Br20℃=Br20℃ -（120-20）*0.10% x Br20℃ = 12 x（1-0.1）=10.8KGs
Hcj120℃ = Hcj20℃-（120-20）*0.5% x Hcj20℃ = 20（1-0.5）= 20*0.5 = 10KOe
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