Explain Weiss and Miller Indices | Solid State | Physical Chemistry скачать в хорошем качестве

Explain Weiss and Miller Indices | Solid State | Physical Chemistry

Download our Android app at https://goo.gl/5JM1G2 To Get New Videos on WhatsApp please fill the form at https://goo.gl/forms/w5jpVKuyjT2JdTIY2 If a face PQR makes intercepts p, q and r on the three axes and the intercepts made by the unit plane are a, b and c then we have,p = na, q = n’b and r = n’’c Where n, n’ and n’’ are simple whole numbers or infinity. Then the face PQR may be presented by (n, n’, n’’). The numbers used to represent a face are called Weiss indices. Miller indices may be defined as the reciprocal of the coefficients of the intercepts, expressed as integers.Thus the intercept made by plane PQR can be expressed as, Then the Miller indices of the plane are (h, k, l). Obviously, the miller indices of a face are inversely proportional to the intercept of that face on the crystallographic axes. Examples of Miller indices: (i) If the intercepts made by plane PQR are 2a, 2b, 3c. The reciprocals of the coefficients of a, b, c are, and LCM of 2, 2, 3 = 6. Multiplying the reciprocals by 6 we have 3, 3, 2. Therefore the miller indices for the plane PQR is (3, 3, 2) (ii) If the intercepts made by plane PQR are a, b, c. The reciprocals of the coefficients of a, b, c are, and LCM of 1, 1, 1 = 1. Therefore the miller indices for the plane PQR is (1, 1, 1) (iii) If the intercepts made by plane PQR are 2a, 3b, ∞c. That means plan is not cutting the z axis. The reciprocals of the coefficients of a, b, c are, and LCM of 2 and 3 = 6. Multiplying the reciprocals by 6 we have 3, 2, 0. Therefore the miller indices for the plane PQR is (3, 2, 0) (iv) If the intercepts made by plane is negative i.e. the face is cut by the axis when extended in the opposite direction, it is represented by putting a bar over it. For Details Visit http://cepekmedia.co.nf http://cepek.hol.es/ http://edmerls.66Ghz.com/ http://edmerls.tk/