42235 2017 eng S193 S200 S1 32 article JCPDS-ICDD Cambridge 1 -- -- -- This paper reports the first successful synthesis and the structural characterization of nanocrystalline and stacking-disordered β-cristobalite AlPO4 that is chemically stabilized down to room temperature and free of crystalline impurity phases. Several batches of the title compound were synthesized and thoroughly characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectroscopy mapping in SEM, solid-state 31P nuclear magnetic resonance (31P-NMR) spectroscopy including the TRAPDOR method, differential thermal analysis (DTA), gas-sorption methods, optical Emission spectroscopy, X-ray fluorescence spectroscopy, and ion chromatography. Parameters that are critical for the synthesis were identified and optimized. The synthesis procedure yields reproducible results and is well documented. A high-quality XRD pattern of the title compound is presented, which was collected with monochromatic copper radiation at room temperature in a wide 2θ range of 5°–100°. Powder Diffraction 10.1017/S0885715617000537 1945-7413 0885-7156 29.09.2017 Burkhard Peplinski Burkart Adamczyk P. Formanek Christian Meyer O. Krüger Holger Scharf Stefan Reinsch Markus Ostermann Marianne Nofz Christian Jäger Christian Adam Franziska Emmerling eng uncontrolled Stabilization of high-temperature phase at RT eng uncontrolled Nanochrystalline AlPO4 eng uncontrolled Beta-christobalite structure type eng uncontrolled High-cristobalite form eng uncontrolled Aluminium phosphate Analytische Chemie Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access")