Professor Thiel's long-suffering grad student Quasimodo claims to have discovered a new phase of molybdenum disilicide (MoSi₂). He states the structure has a base-centered tetragonal lattice (a = 4.54 Å, c = 7.845 Å) with the atomic motif coordinates given in the chart below. His argument rests on the observation that indexing an X-ray diffraction pattern (2= 1.54 Å) using this structure confirms a systematic absence of the (110) reflection at 13.87°. You, of course, know that base-centered tetragonal is not one of the 14 Bravais lattices; therefore, this description of the structure must be wrong.

Professor Thiel's long-suffering grad student Quasimodo claims to have discovered a new phase of molybdenum disilicide (MoSi₂). He states the structure has a base-centered tetragonal lattice (a = 4.54 Å, c = 7.845 Å) with the atomic motif coordinates given in the chart below. His argument rests on the observation that indexing an X-ray diffraction pattern (2= 1.54 Å) using this structure confirms a systematic absence of the (110) reflection at 13.87°. You, of course, know that base-centered tetragonal is not one of the 14 Bravais lattices; therefore, this description of the structure must be wrong.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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