{'fraction_non_alphanumeric': 0.034482758620689655, 'fraction_numerical': 0.017241379310344827, 'mean_word_length': 4.654867256637168, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, '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}}
B-O chemical bond length as a criterion for searching new acentric borate crystals

The relation “composition - structure - NLO property” is observed for a set of >200 acentric borate crystals. The distribution of the crystals over point groups is very inhomogeneous with domination of C2v point group crystals. Acentric borates are distributed on the plane of the shortest chemical bond lengths metal-oxygen over an area, covered by a rosette of three partly crossing ellipses. The dependence of nonlinear optical susceptibility χ(2) on the shortest boron-oxygen bond length L(B-O) in borates has two maximums at L(B-O) = 136 and 148 pm.