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(a) Powder XRD patterns of 0.1 SnCl2+0.9 ZnCl2+Na2CO3+4 NaCl after (i) mixing in a mortar and pestle, (ii) ball milling for 4 h, (iii) heat‐treatment at 400 °C for 1 h, and (iv) washing. (b) Powder XRD patterns of various (SnO2)0.1(ZnO)0.9 powders synthesized by heat‐treatment at 400, 500, 600, and 700 °C. Adapted with permission from ref. [144], Copyright 2006 IOP Publishing Ltd.
