Title:	Visualizando a difratometria.
Authors:	VALADARES, L. F. VALADARES, N. F.
Affiliation:	LEONARDO FONSECA VALADARES, CNPAE; NAPOLEÃO FONSECA VALADARES, UNIVERSIDADE DE BRASÍLIA.
Date Issued:	2026
Citation:	Química Nova, v. 49, e-20260005, n. 1-8, 2026.
Description:	This classroom-oriented study goes beyond simple visualization by directly comparing laser diffractometry and light microscopy measurements to quantify micron-scale spacings in commercial CDs/DVDs (compact disc/digital versatile disc) and electron-microscopy grids. Diffraction angles from reflection (CD/DVD) and transmission (grids) patterns were captured using a digital camera. We systematically validate the diffractometry results with microscopy, teaching the scientific principle of cross-validation. Furthermore, by employing grids with square, rectangular, and hexagonal symmetries, we provide a tangible introduction to symmetry and reciprocal space, demonstrating the inverse relationship between grating spacing and diffraction pattern scale. Designed for educational settings, these experiments use affordable materials to teach core principles of diffraction with applications in material science and chemistry.
Thesagro:	Raio Laser Microscopia
NAL Thesaurus:	Lasers Microscopy
Keywords:	Difratometria Diffractometry
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPAE)