The electronic theory of valency by Nevil Vincent Sidgwick

By Nevil Vincent Sidgwick

This ebook goals at giving a basic account of the rules of valency and molecular constitlltion, based on tI1e Rutherforcl-Bohr atom. In dev'eloping the speculation of valency there are classes open to the chemist. He may well use symbols ,with no certain actual connotation to precise the reacti,rity of the atoms in a molecule, and should depart it to the subseqtlent growth of technology to find what realities those symbols characterize: or he might undertake the suggestions of atomic physics-electrons, nuclei, and orbits-and try and clarify the chemical proof when it comes to those. but when he is taking the latter direction, as is finished during this booklet, he needs to settle for the actual conclusions in complete, and must never assign to those entities houses which the physicists have came across them to not own: he must never use the terminology of pl1ysics except he's ready to acknowledge its legislation. i've got endeavoured to comply to this precept, and never to put mysetf open to the reproach of an eminent physicist, that once chemists speak about electrons they tlSe a unique lang'uage from physicists. i've been cautious to prevent so far as attainable the creation of any actual llypotllcses wllich aren't already sanctioned via people who are most sensible certified to pass judgement on of them.

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The electronic theory of valency

This publication goals at giving a common account of the foundations of valency and molecular constitlltion, based on tI1e Rutherforcl-Bohr atom. In dev'eloping the speculation of valency there are classes open to the chemist. He may perhaps use symbols ,with no yes actual connotation to specific the reacti,rity of the atoms in a molecule, and should depart it to the subseqtlent growth of technological know-how to find what realities those symbols characterize: or he may perhaps undertake the thoughts of atomic physics-electrons, nuclei, and orbits-and attempt to clarify the chemical evidence when it comes to those.

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References 1. 2. 3. 4. 5. 6. 7. 8. 9. N. M. Broto, A. , Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices, Phys. Rev. Lett. 61, 2472 (1988). Magnetfeldsensor MIT ferromagnetischer, dünner Schicht, Patent EP0442407A1. B. S. P. , Giant magnetoresistive in soft ferromagnetic multilayers, Phys. Rev. B 43, 1297 (1991). S. Yuasa, T. Nagahama, A. , Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions, Nature Mater. 3, 868 (2004). P. Parkin, C. Kaiser, A.

25 ) is much higher than that of terminal ternary alloys. 25 ) was 74%, which is the highest value in the Heusler alloys reported thus far. 25 ) alloy has the highest spin polarization and relatively high Tc (895 K), it is expected to be a promising candidate as a spin polarized current source. Co2 Fe-based Heusler alloys have lower kinetics of L21 ordering, unlike Co2 Mn-based Heusler alloys. However, Co2 Fe-based Heusler alloys in CPP-GMR devices have better tolerance against interdiffusion with an Ag spacer layer at elevated temperatures.

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