perminvarn.

Brit.

/ˈpəːmɪnvɑː/, U.S.

/ˈpərmənvɑr/

Forms: also with capital initial.

Origin: Formed within English, by compounding. Etymons: permeability n., invariable adj.

Etymology: < perm- (in permeability n.) + invar- (in invariable adj.).

Any of a series of alloys containing nickel, iron, and cobalt which have an approximately constant magnetic permeability over a range of field strengths.

ΘΚΠ

society > occupation and work > materials > derived or manufactured material > metal > alloy > [noun] > iron and nickel

nickel-iron1867

Invar1902

platinite1905

Nife1909

elinvar1921

permalloy1923

perminvar1928

radiometal1932

1928 Official Gaz. (U.S. Patent Office) 12 June 277/1 Perminvar... For ferromagnetic alloys comprising nickel, iron, and cobalt. Claims use since Aug. 23, 1927.

1928 G. W. Elmen in Jrnl. Franklin Inst. 206 318 We have chosen ‘perminvar’ as the name for alloys in the iron-cobalt-nickel series, which are characterized, when properly heat treated, by constancy of permeability for a considerable range of the lower part of the magnetization curve.

1936 R. S. Glasgow Princ. Radio Engin. iii. 64 The use of a perminvar core with its linear hysteresis loop will prevent cross talk and interference due to these modulation effects.

1968 S. J. Rosenberg Nickel & its Alloys 131/2 Useful alloys in the Perminvar class include the nickel-iron-alloys Conpernik (50% Ni) and Isoperm (40%Ni).

1995 Physical Rev. Lett. 75 4695/1 Figure 1 shows the Barkhausen signal obtained from a 5 mm × 2 mm × 0.1 mm sample of Perminvar (Fe₃₀Ni₄₅Co₂₅) at room temperature.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	perminvar
释义	perminvarn. Brit. /ˈpəːmɪnvɑː/, U.S. /ˈpərmənvɑr/ Forms: also with capital initial. Origin: Formed within English, by compounding. Etymons: permeability n., invariable adj. Etymology: < perm- (in permeability n.) + invar- (in invariable adj.). Any of a series of alloys containing nickel, iron, and cobalt which have an approximately constant magnetic permeability over a range of field strengths. ΘΚΠ society > occupation and work > materials > derived or manufactured material > metal > alloy > [noun] > iron and nickel nickel-iron1867 Invar1902 platinite1905 Nife1909 elinvar1921 permalloy1923 perminvar1928 radiometal1932 1928 Official Gaz. (U.S. Patent Office) 12 June 277/1 Perminvar... For ferromagnetic alloys comprising nickel, iron, and cobalt. Claims use since Aug. 23, 1927. 1928 G. W. Elmen in Jrnl. Franklin Inst. 206 318 We have chosen ‘perminvar’ as the name for alloys in the iron-cobalt-nickel series, which are characterized, when properly heat treated, by constancy of permeability for a considerable range of the lower part of the magnetization curve. 1936 R. S. Glasgow Princ. Radio Engin. iii. 64 The use of a perminvar core with its linear hysteresis loop will prevent cross talk and interference due to these modulation effects. 1968 S. J. Rosenberg Nickel & its Alloys 131/2 Useful alloys in the Perminvar class include the nickel-iron-alloys Conpernik (50% Ni) and Isoperm (40%Ni). 1995 Physical Rev. Lett. 75 4695/1 Figure 1 shows the Barkhausen signal obtained from a 5 mm × 2 mm × 0.1 mm sample of Perminvar (Fe₃₀Ni₄₅Co₂₅) at room temperature. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1928
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