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Medical uses. The Pfizer–BioNTech COVID-19 vaccine is used to provide protection against COVID-19, caused by infection with the SARS-CoV-2 virus, by eliciting an immune response to the S antigen. [1] [2] [30] [39] The vaccine is used to reduce morbidity and mortality from COVID-19.
Arnold Bennett (1867–1931) was an English author who wrote 34 novels, 7 volumes of short stories and a daily journal of more than a million words. He also wrote or co-wrote 13 plays, wrote articles and stories for more than 100 newspapers and periodicals, worked in and briefly ran the UK's Ministry of Information in the First World War, and ...
[o] The main island of Taiwan, also known as Formosa, lies between the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south.
- Synthesis
- Structure
- Physical Properties
- Applications
- Further Reading
Na0.5Bi0.5TiO3 is not a naturally occurring mineral and several synthesis routes to obtain the compound have been developed. It can be easily prepared by solid state reaction between Na2CO3, Bi2O3 and TiO2at temperatures around 850 °C.
The exact room-temperature crystal structure of sodium bismuth titanate has been a matter of debate for several years. Early studies in the 1960s using X-ray diffraction suggested Na0.5Bi0.5TiO3 to adopt either a pseudo-cubic or a rhombohedral crystal structure. In 2010, based on the high-resolution single-crystal X-ray diffraction data, a monoclin...
Na0.5Bi0.5TiO3 is a relaxor ferroelectric. Its optical band gap was reported to be in the 3.0–3.5 eV.
Various solid solutions with tetragonal ferroelectric perovskites including BaTiO3, Bi0.5K0.5TiO3 have been developed to obtain morphotropic phase boundaries to enhance the piezoelectric properties of Na0.5Bi0.5TiO3. The extraordinarily large strain generated by a field-induced phase transition in sodium bismuth titanate-based solid solutions promp...
Lead-Free Piezoelectrics, Ed. Shashank Priya and Sahn Nahm,(2012), Springer-Verlag, New York. doi:10.1007/978-1-4419-9598-8.
SARS-CoV-2 Omicron variant - Wikipedia. Omicron (B.1.1.529) is a variant of SARS-CoV-2 first reported to the World Health Organization (WHO) by the Network for Genomics Surveillance in South Africa on 24 November 2021. [10] [11] It was first detected in Botswana and has spread to become the predominant variant in circulation around the world. [12]
The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.
The COVID-19 pandemic (also known as the coronavirus pandemic ), caused by severe acute respiratory syndrome coronavirus 2 ( SARS-CoV-2 ), began with an outbreak in Wuhan, China, in December 2019. It spread to other areas of Asia, and then worldwide in early 2020.
