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2. (a) WO3 exists in several polymorphic forms, including y-WO3 with a monoclinic unit cell at room temperature and B-WO
Posted: Fri Apr 29, 2022 1:00 pm
by answerhappygod
- 2 A Wo3 Exists In Several Polymorphic Forms Including Y Wo3 With A Monoclinic Unit Cell At Room Temperature And B Wo 1 (53.34 KiB) Viewed 72 times
2. (a) WO3 exists in several polymorphic forms, including y-WO3 with a monoclinic unit cell at room temperature and B-WO3 with an orthorhombic unit cell, which is stable above 623 K. Identify the y- and B-forms of WO3 from the unit-cell parameter information presented below, giving reasons for your answer. a/Å b/Å c/Å alº | Blº | 200 Crystal 1 7.3397(2) 7.5744(3) 7.7452(3) 90.0 90.0 90.0 Crystal 2 3.846(1) 7.532(2) 7.302(2) 90.0 90.88(2) 90.0 (2 marks) (b) Calculate the minimum d-spacing that can be determined using Cr- Kai radiation (1 = 2.2896 Å). (2 marks)