{"id":580,"date":"2026-10-21T23:36:49","date_gmt":"2026-10-21T15:36:49","guid":{"rendered":"http:\/\/www.vissmaya.com\/blog\/?p=580"},"modified":"2026-10-21T23:36:49","modified_gmt":"2026-10-21T15:36:49","slug":"what-is-the-chemical-formula-of-bismuth-trioxide-4115-17f6e8","status":"publish","type":"post","link":"http:\/\/www.vissmaya.com\/blog\/2026\/10\/21\/what-is-the-chemical-formula-of-bismuth-trioxide-4115-17f6e8\/","title":{"rendered":"What is the chemical formula of Bismuth Trioxide?"},"content":{"rendered":"

What\u2019s the Chemical Formula of Bismuth Trioxide? If you\u2019ve ever stumbled on this question while sourcing materials for ceramics, electronics, or cosmetics (we see you, lab techs and production managers), you\u2019re not alone. As a bismuth trioxide supplier, I get asked this a lot\u2014usually when someone\u2019s finalizing a spec sheet, troubleshooting a batch gone wrong, or just double-checking they ordered the right stuff. Let\u2019s break this down simply, no stuffy textbook jargon, and tie it all to why the formula matters for anyone working with this material. Bismuth Trioxide<\/a><\/p>\n

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First off, let\u2019s start with the basics: bismuth is a post-transition metal, right? It\u2019s in group 15 of the periodic table, same as nitrogen and phosphorus, but way denser and less reactive. When it forms an oxide\u2014meaning it\u2019s bonded with oxygen, which is group 16\u2014bismuth can have a couple of different oxidation states. Oxidation state is just a fancy way of saying how many electrons an atom gives or takes when it bonds. For bismuth trioxide, we\u2019re dealing with the most common and stable form, which means bismuth is in its +3 oxidation state. Oxygen always lands at -2 when forming oxides like this.<\/p>\n

So to get the formula, we use the crisscross method that I remember from high school chem, but let\u2019s make it quick. If Bi is +3 and O is -2, we need to balance the charges so the whole molecule is neutral. That means two bismuth atoms (each +3, total +6) balance three oxygen atoms (each -2, total -6). Boom\u2014you get Bi\u2082O\u2083. That\u2019s the formula for bismuth trioxide. No, wait, it\u2019s not BiO\u2083\u2014don\u2019t let that mix-up happen. I\u2019ve had a few new customers reach out and ask for BiO\u2083 once or twice, and we have to gently correct them because that\u2019s a totally different (and way less useful, for most applications) compound.<\/p>\n

Wait, why is \u201ctrioxide\u201d so key here? The prefix \u201ctri\u201d means three, so trioxide means three oxygen atoms. Some people mix up tri with the valence (charge) of bismuth, which is +3, so they write Bi\u2083O\u2082 or something\u2014nope, that\u2019s not right either. Let\u2019s clarify: naming for oxides works with prefixes for nonmetals, but for metals like bismuth, we usually go by the oxidation state. Bismuth trioxide is also called bismuth(III) oxide, which is another name you\u2019ll see in spec sheets. That\u2019s the same stuff we supply. There\u2019s also a less common bismuth(V) oxide, Bi\u2082O\u2085, but that\u2019s super unstable, not used in most industrial or commercial applications, so if you\u2019re asking about bismuth trioxide, it\u2019s 100% Bi\u2082O\u2083.<\/p>\n

Now, as a supplier, let\u2019s talk about why this formula actually matters, not just a textbook fact. If you\u2019re a ceramic manufacturer, for example, the melting point of Bi\u2082O\u2083 is way lower than most other metal oxides\u2014around 817\u00b0C, right? That means if you get the formula wrong, and you accidentally use a different bismuth oxide, your ceramic glaze won\u2019t fire right, it\u2019ll be too brittle, or it won\u2019t have that iridescent finish you\u2019re going for. I\u2019ve seen a customer who ordered the wrong oxide once\u2014they thought they got trioxide, but it was a mix-up with a different bismuth compound, and they wasted a whole week of production time. No one wants that.<\/p>\n

Electronics folks? Bi\u2082O\u2083 is used in semiconductors and varistors\u2014parts that protect circuits from power surges. The stoichiometry (that\u2019s just the ratio of atoms, so for Bi\u2082O\u2083 it\u2019s 2 Bi to 3 O) directly affects how well those varistors work. If the formula is off, the varistor\u2019s voltage rating will be wrong, and your end product (say, a phone charger or a car sensor) might fail. We test every batch we supply to make sure it\u2019s 99% pure Bi\u2082O\u2083, because even a tiny impurity or wrong compound can mess up that performance.<\/p>\n

Cosmetic formulators too\u2014wait, bismuth oxychloride is big in makeup, but bismuth trioxide is sometimes used as a pigment or a UV protectant in sunscreens. The formula Bi\u2082O\u2083 gives it that pearlescent, white color that\u2019s safe for skin, as long as the purity is right. If it was the wrong formula, it might be toxic or not give the right finish.<\/p>\n

Let\u2019s clear up a couple common myths I hear from new contacts. First, is bismuth trioxide the same as bismuth oxide? Mostly\u2014unless someone\u2019s referring to that unstable Bi\u2082O\u2085, which is a special case. 99% of the time, when someone says \u201cbismuth oxide,\u201d they mean bismuth trioxide, so Bi\u2082O\u2083. Second, what about nanoparticles? A lot of customers ask for nano-sized Bi\u2082O\u2083 these days for coatings or catalysts. The formula doesn\u2019t change when it\u2019s nano\u2014it\u2019s still Bi\u2082O\u2083, just smaller particle size. That\u2019s a key point for us, because we supply both standard and nano-grade Bi\u2082O\u2083, all with the correct chemical formula, because we know how critical that is for applications.<\/p>\n

Wait, another thing: some sources might spell it \u201cbis-muth\u201d instead of \u201cbismuth,\u201d but that\u2019s just a pronunciation thing, not related to the formula. And don\u2019t confuse it with bismuth subnitrate, which is used for antacids\u2014totally different compound, formula BiONO\u2083. Again, that\u2019s not our product, but it\u2019s a common mix-up.<\/p>\n

Now, why would you care about the formula beyond just ordering the right stuff? For us, as a reliable supplier, we know that specs are non-negotiable. If your process calls for bismuth trioxide, you need Bi\u2082O\u2083, period. A lot of smaller suppliers might cut corners and mix in other bismuth oxides, but we don\u2019t. We run quality control tests (XRD, for the chem folks out there) to confirm the crystalline structure is exactly the alpha-phase Bi\u2082O\u2083, which is the most common and useful for industrial use. Gamma-phase is another form, but it turns into alpha when heated, so we make sure we\u2019re supplying the right phase too\u2014again, tied to that formula.<\/p>\n

Let me wrap this up so it\u2019s not just a chem lecture. If you were Googling \u201cchemical formula of bismuth trioxide\u201d and ended up here, you probably don\u2019t just want a one-sentence answer. You want to know why that answer matters for your work, and who you can trust to supply the right stuff. As someone who\u2019s been in this game for years, I can tell you that the small stuff\u2014like getting the formula right\u2014makes all the difference between a smooth production run and a costly mistake.<\/p>\n

<\/p>\n

If you\u2019re ready to order bismuth trioxide, or just have questions about purity, grades, or applications, reach out to us. We can share COAs (certificates of analysis) for every batch, walk you through how Bi\u2082O\u2083 works for your specific use case, and make sure you get exactly what you need\u2014no mix-ups, no wrong formulas, just reliable product. Don\u2019t waste another hour second-guessing; let\u2019s make your next order straightforward.<\/p>\n

Cellulose Ethers<\/a> References<\/p>\n

    \n
  1. CRC Handbook of Chemistry and Physics, 102nd Edition, CRC Press, 2021.<\/li>\n
  2. \u201cBismuth Oxides: Synthesis, Properties, and Applications,\u201d Journal of Materials Science, vol. 55, 2020, pp. 12147\u201312172.<\/li>\n
  3. International Union of Pure and Applied Chemistry (IUPAC) Nomenclature of Inorganic Chemistry, 2005.<\/li>\n
  4. \u201cIndustrial Applications of Bismuth Compounds,\u201d Industrial & Engineering Chemistry Research, vol. 58, 2019, pp. 17893\u201317902.<\/li>\n<\/ol>\n
    \n

    Changsha Goomoo Chemical Technology Co., Ltd.<\/a>
    With abundant experience, we are one of the most reliable bismuth trioxide manufacturers and suppliers in China. We warmly welcome you to buy customized bismuth trioxide made in China here from our factory. If you have any enquiry about free sample, please feel free to email us.
    Address: No.61,Jinma Road,Kaifu District Changsha 41005,Hunan,P.R.China
    E-mail: allen@goomoochina.com
    WebSite:     https:\/\/www.gumchem.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    What\u2019s the Chemical Formula of Bismuth Trioxide? If you\u2019ve ever stumbled on this question while sourcing … What is the chemical formula of Bismuth Trioxide?<\/span>Read more<\/a><\/p>\n","protected":false},"author":337,"featured_media":580,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[543],"class_list":["post-580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-bismuth-trioxide-45b3-18c3d0"],"_links":{"self":[{"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/posts\/580","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/users\/337"}],"replies":[{"embeddable":true,"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/comments?post=580"}],"version-history":[{"count":0,"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/posts\/580\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/posts\/580"}],"wp:attachment":[{"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/media?parent=580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/categories?post=580"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.vissmaya.com\/blog\/wp-json\/wp\/v2\/tags?post=580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}