*3.3. X-ray Powder Diffraction*

The powder X-ray measurements were performed using EMPYREAN equipped with the water-cooled X-ray tube with Cu anode with the wavelengths of characteristic radiation λCuKα<sup>1</sup> = 1.54056 Å and λCuKα<sup>2</sup> = 1.54443 Å. In order to suppress the <sup>K</sup>β radiation the Ni filter was used. The central part of the data acquisition system was the silicon strip detector PIXcel. The low temperature measurements were made using the closed cycle helium cryostat Phenix—Oxford Cryosystems.
