Erbium tetraboride

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| ImageFile = YB4structure.jpg

| ImageSize =

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| IUPACName = Erbium tetraboride

| OtherNames =

|Section1={{Chembox Identifiers

| CASNo = 12310-44-0

| PubChem = 92026692

| ChemSpiderID = 62855474

| PubChem_Comment = has wrong formula

| EC_number = 235-578-5

| StdInChI=1S/4B.Er

| StdInChIKey = ZJQHBIRDYKOZLM-UHFFFAOYSA-N

| SMILES = [Er].[B].[B].[B].[B]

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|Section2={{Chembox Properties

| Formula = ErB₄

| MolarMass = 210.503g/mol

| Appearance =

| Density =

| MeltingPtK = 2633

| MeltingPt_ref = {{cite journal |last1=Mar |first1=Raymond W |last2=Stout |first2=Norman D |title=Melting temperature and high-temperature enthalpies of erbium tetraboride |journal=The Journal of Chemical Thermodynamics |date=October 1974 |volume=6 |issue=10 |pages=943–947 |doi=10.1016/0021-9614(74)90215-8}}

| BoilingPt =

| Solubility = }}

|Section3={{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt = }}

|Section8={{Chembox Related

| OtherCompounds = Erbium hexaboride

}}

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Erbium tetraboride is a boride of the lanthanide metal erbium.{{cite book|last=Perry|first=Dale L|title=Handbook of Inorganic Compounds|publisher=Taylor & Francis|date=2011|edition=2|pages=163|isbn=9781439814628|url=https://books.google.com/books?id=SFD30BvPBhoC&q=%22Erbium+Boride%22&pg=PA163|accessdate=14 December 2013}}

It is hard and has a high melting point. Industrial applications of erbium boride include use in semiconductors, the blades of gas turbines, and the nozzles of rocket engines.[http://www.americanelements.com/erb.html American Elements]