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| verifiedrevid = 400145676 |
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| verifiedrevid = 442344823 |
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| Name = Lithium metaborate |
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| Name = Lithium metaborate |
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| Reference = <ref name="hand"> |
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| Reference = <ref name=lide1998/> |
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{{Citation |
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| last = Lide |
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| first = David R. |
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| OtherNames = boric acid, lithium salt |
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| author-link = |
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|Section1={{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| publication-date = |
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| date = |
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| year = 1998 |
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| title = Handbook of Chemistry and Physics |
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| edition = 87 |
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| volume = |
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| series = |
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| publication-place = Boca Raton, FL |
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| place = |
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| publisher = CRC Press |
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| id = |
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| isbn = 0-8493-0594-2 |
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| doi = |
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| pages = 4–66 |
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}}</ref> |
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| ImageFile = |
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| ImageName = |
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| OtherNames = boric acid, lithium salt |
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| Section1 = {{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 109911 |
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| ChemSpiderID = 109911 |
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| InChI = 1/BO2.Li/c2-1-3;/q-1;+1 |
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| InChI = 1/BO2.Li/c2-1-3;/q-1;+1 |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey = HZRMTWQRDMYLNW-UHFFFAOYSA-N |
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| StdInChIKey = HZRMTWQRDMYLNW-UHFFFAOYSA-N |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo = 13453-69-5 |
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| CASNo = 13453-69-5 |
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| PubChem = 123308 |
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| PubChem = 123308 |
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| EINECS = 236-631-5 |
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| EINECS = 236-631-5 |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = LiBO<sub>2</sub> |
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| Formula = LiBO<sub>2</sub> |
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| MolarMass = 49.751 g/mol |
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| MolarMass = 49.751 g/mol |
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| Appearance = white ] ] crystals |
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| Appearance = white ] ] crystals |
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| Density = 2.223 g/cm<sup>3</sup> |
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| Density = 2.223 g/cm<sup>3</sup> |
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| Solubility = 0.89 g/100 mL (0 °C) <br /> 2.57 g/100 mL (20 °C) <br /> 11.8 g/100 mL (80 °C) |
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| Solubility = very soluble |
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| SolubleOther = soluble in ] |
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| SolubleOther = soluble in ] |
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| MeltingPt = 849°C |
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| MeltingPtC = 849 |
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| Section4 = {{Chembox Thermochemistry |
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|Section4={{Chembox Thermochemistry |
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| DeltaHf = -20.75 kJ/g |
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| DeltaHf = -1022 kJ/mol |
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| DeltaHc = |
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| DeltaHc = 33.9 kJ/mol |
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| Entropy = |
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| DeltaGf = |
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| HeatCapacity = 1.202 J/(g K) |
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| Entropy = 51.3 J/mol K |
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| HeatCapacity = 59.8 J/mol K |
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| Section7 = {{Chembox Hazards |
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|Section7={{Chembox Hazards |
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| ExternalMSDS = |
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| ExternalSDS = |
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| NFPA-H = 2 |
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| NFPA-H = 2 |
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| NFPA-R = 0 |
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| NFPA-R = 0 |
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| NFPA-F = 0 |
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| NFPA-F = 0 |
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'''Lithium metaborate''' is a ] of ], ], and ] with elemental formula {{chem2|LiBO2}}. It is often encountered as a ], {{chem2|LiBO2*''n''H2O}}, where ''n'' is usually 2 or 4. However, these formulas do not describe the actual structure of the solids. |
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'''Lithium metaborate''' (]]]) is a ]. |
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Lithium metaborate is one of the ]s, a large family of ]s (ionic compounds) with anions consisting of boron, oxygen, and ]. |
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==Uses== |
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==Structure== |
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Lithium metaborate or Lithium Tetraborate, or a mixture of both, can be used in ] sample preparation of various samples for analysis by ], ], ], ] and ]. |
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Lithium metaborate has several crystal forms. |
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The α form consists of infinite chains of trigonal planar metaborate anions {{chem2|n}}. |
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Simultaneous determination of parts-per-million level Cr, As, Cd and Pb, and major elements in low level contaminated soils using borate fusion and energy dispersive X-ray fluorescence spectrometry with polarized excitation.<ref></ref> |
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The γ form is stable at 15 ] and 950 °C. It has a polymeric cation consisting of a tridimensional regular array of {{chem2|(-)}} tetrahedra sharing ] vertices, alernating with lithium cations, each also surrounded by four oxygen atoms. The B-O distances are 148.3 ], the Li-O distances are 196 pm.<ref name=mare1966/> |
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Lithium metaborate forms glass relatively easily, and consists of approximately 40% tetrahedral borate anions, and 60% trigonal planar boron. The ratio of tetrahedral to trigonal boron has been shown to be strongly temperature dependent in the liquid and supercooled liquid state.<ref>{{cite journal |last1=Alderman |first1=Oliver |last2=Benmore |first2=Chris |last3=Weber |first3=Rick |title=Consequences of sp2–sp3 boron isomerization in supercooled liquid borates |journal=Applied Physics Letters |date=2020 |volume=117 |issue=13 |page=131901 |doi=10.1063/5.0024457 |url=https://pubs.aip.org/aip/apl/article/117/13/131901/567154/Consequences-of-sp2-sp3-boron-isomerization-in|doi-access=free }}</ref><ref>{{cite journal |last1=Alderman |first1=Oliver |last2=Benmore |first2=Chris |last3=Reynolds |first3=Bryce |last4=Royle |first4=Brock |last5=Feller |first5=Steve |last6=Weber |first6=Rick |title=Liquid fragility maximum in lithium borate glass-forming melts related to the local structure |journal=International Journal of Applied Glass Science |date=2023 |volume=14 |pages=52–68 |doi=10.1111/ijag.16611 |doi-access=free }}</ref> |
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==Applications== |
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===Laboratory=== |
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Molten lithium metaborate, often mixed with ] {{chem2|Li2B4O7}}, is used to dissolve ] samples for analysis by ], ], ], ], and ],<ref name=hett2004/> modern versions of classical ]. The process may be used also to facilitate the dissolution of oxides in acids for ].<ref name=clais2003/> Small amounts of ] {{chem2|LiBr}} or ] {{chem2|LiI}} may be added as ] and ] ]s.<ref name=clais2003/> |
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Lithium metaborate dissolves ]ic oxides {{chem2|Me_{''x''}O_{''y''}|}} with ''x'' < ''y'', such as ] ], ], ], ], ], ], ], and ]. Lithium tetraborate, on the other hand, dissolves ] oxides with ''x'' > ''y'', such as ], ] and other oxides of the ] and ]. Most oxides are best dissolved in a mixture of the two lithium borate salts, for ].<ref name=clais2003/> |
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== References == |
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== References == |
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<references> |
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{{reflist}} |
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<ref name=lide1998>David R. Lide (1998): ''Handbook of Chemistry and Physics'', edition 87, pages 4–66. CRC Press. {{isbn|0-8493-0594-2}}</ref> |
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<ref name=mare1966>M. Marezio and J. P. Remeika (1966): "Polymorphism of LiMO2 Compounds and High‐Pressure Single‐Crystal Synthesis of LiBO2". ''Journal of Chemical Physics'', volume 44, issue 9, pages 3348-. {{doi|10.1063/1.1727236}}</ref> |
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<ref name=hett2004>Terrance D. Hettipathirana (2004): "Simultaneous determination of parts-per-million level Cr, As, Cd and Pb, and major elements in low level contaminated soils using borate fusion and energy dispersive X-ray fluorescence spectrometry with polarized excitation". ''Spectrochimica Acta Part B: Atomic Spectroscopy'', volume 59, issue 2, pages 223-229. {{doi|10.1016/j.sab.2003.12.013}}</ref> |
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<ref name=clais2003>Fernand Claisse (2003): "". ''Comprehensive Analytical Chemistry: Sample Preparation for Trace Element Analysis'', volume 41, pages 301-311. </ref> |
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</references> |
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{{Lithium compounds}} |
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{{Lithium compounds}} |
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