@article{
 title = {Hydrothermal crystal growth, piezoelectricity, and triboluminescence of KNaNbOF5},
 type = {article},
 year = {2016},
 keywords = {Crystal growth,Oxide-fluoride,Piezoelectricity,Triboluminescence},
 pages = {78-82},
 volume = {236},
 websites = {http://www.sciencedirect.com/science/article/pii/S0022459615300621},
 month = {4},
 series = {Materials Discovery Through Crystal Growth},
 id = {249901de-fbce-3508-ab1a-2b17b473a51d},
 created = {2020-12-18T06:00:33.793Z},
 file_attached = {false},
 profile_id = {8e06da9e-cb81-3353-9244-a0df0d52905d},
 group_id = {f41a1b35-d892-30f4-b9a4-ee2a344e7432},
 last_modified = {2020-12-18T06:00:33.793Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {false},
 hidden = {false},
 source_type = {article},
 language = {en},
 private_publication = {false},
 abstract = {Single crystals of the noncentrosymmetric KNaNbOF5 polymorph were grown for piezoelectric and triboluminescent measurements. Piezoelectric measurements yielded a d33 value of ±6.3 pCN−1 and an effective electromechanical coupling coefficient of up to 0.1565 in the frequency range 1960–2080kHz. Crystals of KNaNbOF5 were found to exhibit a strong triboluminscence effect visible to the naked eye as blue sparks when crystals are crushed. This triboluminescence effect is uncommon in that it is likely independent from both the piezoelectric effect and atmospheric electrical discharge. Instead, triboluminescence may originate from crystal defects or be related to an electroluminescence effect.},
 bibtype = {article},
 author = {Chang, Kelvin B and Edwards, Bryce W and Frazer, Laszlo and Lenferink, Erik J and Stanev, Teodor K and Stern, Nathaniel P and Nino, Juan C and Poeppelmeier, Kenneth R},
 doi = {10.1016/j.jssc.2015.07.011},
 journal = {Journal of Solid State Chemistry}
}

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Piezoelectric measurements yielded a d33 value of ±6.3 pCN−1 and an effective electromechanical coupling coefficient of up to 0.1565 in the frequency range 1960–2080kHz. Crystals of KNaNbOF5 were found to exhibit a strong triboluminscence effect visible to the naked eye as blue sparks when crystals are crushed. This triboluminescence effect is uncommon in that it is likely independent from both the piezoelectric effect and atmospheric electrical discharge. 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