Micro-XRF and xanes study of Zn-doped ormosil phosphotungstate hybrid films with enhanced photochromic response - Ferreira Neto, Elias Paiva; Ullah, Sajjad; Ysnaga, Orlando Armando Elguera; Rodrigues Filho, Ubirajara Pereira (Reunião Anual de Usuários do LNLS - RAU, 2014)