{'fraction_non_alphanumeric': 0.06291834002677377, 'fraction_numerical': 0.0642570281124498, 'mean_word_length': 4.753846153846154, '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}}
Electrical Properties of CuO-doped (K0.5Na0.5)(Nb0.92Sb0.03Ta0.05)O3 Piezoelectric Ceramics with High Q m

(K0.5Na0.5)(Nb0.92Sb0.03Ta0.05)O3-xmol%CuO (KNNST-xCu) piezoelectric ceramics were prepared by traditional technique. The phase structure, surface morphologies, piezoelectric constant d 33, electromechanical coupling factor k p, mechanical quality factor Q m and the dielectric loss tan δ of the specimen were investigated. CuO addition “hardened” the KNNST ceramics and significantly enhanced the mechanical quality factor Q m. The results show that the ceramics doped with 2.0–3.0 mol% CuO exhibit a high Qm of 1134 and a low tan δ of 0.8%, while the other piezoelectric properties remain reasonably high: d 33 = 130 pC/N and k p = 44.1%.