{'fraction_non_alphanumeric': 0.029551954242135366, 'fraction_numerical': 0.01811248808388942, 'mean_word_length': 5.363636363636363, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Resistivity relaxation of ammonium halides near high‐pressure induced phase transitions

Comparative studies of high‐pressure effect on the resistivity of ammonium halides NH4X (X = F, Cl, Br) at the temperatures of 77 to 400 K are presented. High‐pressure phase transitions are found being apparent in a sharp change of the resistance by orders of magnitude at some critical pressures and a hysteresis typical for first‐order phase transitions. The critical pressure values correlate with the material density being approximately 40, 27 and 15 GPa for NH4F, NH4Cl and NH4Br, respectively. Relaxation times of resistivity at changing pressure are determined. The relaxation of resistivity obeys the exponential law at the pressures far enough from the critical ones; the relaxation times are tenths seconds to minutes. Near the critical pressures, the resistivity relaxation becomes highly non‐exponential; the time delay of hours to days appears before the phase transition (the resistance jump). (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)