# Talk:Lattice energy

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## Lattice energy

Lattice Energy is the amount of energy required to separate one mole of solid ionic compound into its gaseous ions

## diamond crystal lattice picture

This is not a picture of the diamond crystal lattice- diamond is pure carbon i.e only one type of atom- and each atom is coordinated by 4 others. Also the article restricts itself to ionic solids - so why show a picture of covalent solid? --Axiosaurus (talk) 11:53, 13 August 2008 (UTC)

I agree, so I've replaced the figure with a NaCl lattice, which is one of the examples given in the article. --Itub (talk) 09:10, 14 August 2008 (UTC)

## be careful

the lattice energy is not equal to the lattice enthalpy which links here: It is: $\Delta _G U=\Delta _G H -p\Delta V_m$, Where $\Delta _G U$ is the molar lattice energy and $\Delta _G H$ the molar lattice enthalpy and $\Delta V_m$ the change of the volume per mol. source: [1]--Biggerj1 (talk) 09:02, 10 January 2013 (UTC)

### changed enthalpy to energy of formation according to your suggestion in English Wikipedia

and also incororporated other material from German Wikipedia article, extending to molecular and covalent crystals, not just ionic. Enschuldigen Sie mir, meine Deutsch ist nicht so gut als Ihre Englisch.72.89.126.125 08:26, 3. Jan. 2014 (CET)

The reason why I didn't change en:lattice energy is, that it most probably mixes lattice energy and lattice enthalpy since lattice enthalpy links to the article. It requires a bit work to resolve the mixing. For example the presented case of Na^+(g)+Cl^-(g) -> NaCl(s) is most probably related to the lattice enthalpy (you may follow its calculation here http://www.docbrown.info/page07/delta2Hb.htm ) and not the lattice energy. In this fashion all the other quantities should be checked (simply search for kJ/mol and you see all the critical places).--biggerj1 (Diskussion) 12:11, 3. Jan. 2014 (CET) — Preceding unsigned comment added by Biggerj1 (talkcontribs) 11:12, 3 January 2014 (UTC)
you may also check whether a redirect of lattice enthalpy to lattice energy is sensible since it is not the same object. At least a clear distinction should be made.--Biggerj1 (talk) 11:24, 3 January 2014 (UTC)

## Lattice energy for metallic solids

What data are there in case of metal lattice?--188.26.22.131 (talk) 10:39, 23 July 2013 (UTC)