Question

empty space in crystal lattice field by air or vaccume or there is no empty space in side crystal lattice

Answer 1

A lattice point is "a point about which an atom, ion, or molecule is free to vibrate in a crystal."
http://www.alcwin.org/Chemical_Terms_Description-346-l.htm

By definition atoms, ions, or molecules fill the lattice points. Electrons move around in the space between the nuclei. Here are some pictures of the "electron density of crystals":
http://home.hiroshima-u.ac.jp/fpc/oguchi/graphics/crys-images.html

Due to electron-electron repulsion, the atoms in crystals can be modeled as hard spheres. It may be important to remember that the probability of an electron being outside of the model's bounding sphere is not zero.

Answer 2

The space between lattice points in a crystal is typically considered just as empty space, though it depends upon the crystal and the charge distribution around the atoms that make up the crystal. By empty space, you can presume it means vacuum, though due to the nature of quantum mechanics, vacuums completely empty.

Certainly it will not be filled with air, since air is composed of molecules, which will be of equivalent size to the unit cell of a crystal lattice. That being said, there are some crystal structures that form into an array large enough to contain other molecules. Carbon 60 for example (AKA buckyballs) (see attached image) are quite large, and can be used to cage other "free" atoms and molecules within them.

Occasionally crystal defects will be present in a crystal, such as interstitial atoms, or atomic vacancies (or both). These point defects will of course fill or create spaces within the crystal lattice. However, vacancies will often leave trapped charge within them, creating "colour centres" within the crystal.

Answer 3

basically there is practically speaking no space empty in the lattice.... they are mostly filled by the anion or the impurities and the little left out space is just there..... it is used to create anion vacancies.... i mean the frenkel defect etc etc....

Answer 4

i think you are having problem in visualizing lattices.
There are voids but not accessible to air, as there are many molecule in air(co2, o2,n2) which are large enough,hence cant fit into lattice, generally.