Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium.
|Element category||Alkaline Earth Metal|
|Phase at STP||Solid|
|Ultimate Tensile Strength||110 MPa|
|Young’s Modulus of Elasticity||20 GPa|
|Brinell Hardness||170 – 400 MPa|
|Melting Point||842 °C|
|Boiling Point||1484 °C|
|Thermal Conductivity||200 W/mK|
|Thermal Expansion Coefficient||22.3 µm/mK|
|Specific Heat||0.63 J/g K|
|Heat of Fusion||8.54 kJ/mol|
|Heat of Vaporization||153.3 kJ/mol|
|Electrical resistivity [nanoOhm meter]||33.6|
|Magnetic Susceptibility||+40e-6 cm^3/mol|
Applications of Calcium
The largest use of metallic calcium is in steelmaking, due to its strong chemical affinity for oxygen and sulfur. Its oxides and sulfides, once formed, give liquid lime aluminate and sulfide inclusions in steel which float out. Calcium compounds are used as manufacture of insecticides, paints, blackboard chalk, textile and fireworks.
Production and Price of Calcium
Raw materials prices change daily. They are primarily driven by supply, demand and energy prices. In 2019, prices of pure Calcium were at around 110 $/kg.
In 2005, about 24000 tonnes of calcium were produced; about half of the world’s extracted calcium is used by the United States, with about 80% of the output used each year. Pure calcium metal is now made commercially by heating lime with aluminum. The metal reacts slowly with oxygen, water vapour, and nitrogen of the air to form a yellow coating of the oxide, hydroxide, and nitride.
Mechanical Properties of Calcium
Strength of Calcium
In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions. In designing structures and machines, it is important to consider these factors, in order that the material selected will have adequate strength to resist applied loads or forces and retain its original shape. Strength of a material is its ability to withstand this applied load without failure or plastic deformation.
For tensile stress, the capacity of a material or structure to withstand loads tending to elongate is known as ultimate tensile strength (UTS). Yield strength or yield stress is the material property defined as the stress at which a material begins to deform plastically whereas yield point is the point where nonlinear (elastic + plastic) deformation begins.
See also: Strength of Materials
Ultimate Tensile Strength of Calcium
Ultimate tensile strength of Calcium is 110 MPa.
Yield Strength of Calcium
Yield strength of Calcium is N/A.
Modulus of Elasticity of Calcium
The Young’s modulus of elasticity of Calcium is 20 GPa.
Hardness of Calcium
In materials science, hardness is the ability to withstand surface indentation (localized plastic deformation) and scratching. Brinell hardness test is one of indentation hardness tests, that has been developed for hardness testing. In Brinell tests, a hard, spherical indenter is forced under a specific load into the surface of the metal to be tested.
Brinell hardness of Calcium is approximately 170 – 400 MPa.
The Vickers hardness test method was developed by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials. The Vickers hardness test method can be also used as a microhardness test method, which is mostly used for small parts, thin sections, or case depth work.
Vickers hardness of Calcium is approximately N/A.
Scratch hardness is the measure of how resistant a sample is to permanent plastic deformation due to friction from a sharp object. The most common scale for this qualitative test is Mohs scale, which is used in mineralogy. The Mohs scale of mineral hardness is based on the ability of one natural sample of mineral to scratch another mineral visibly.
Calcium is has a hardness of approximately 1.5.
See also: Hardness of Materials
Calcium – Crystal Structure
A possible crystal structure of Calcium is face-centered cubic structure.
In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. A crystal lattice is a repeating pattern of mathematical points that extends throughout space. The forces of chemical bonding causes this repetition. It is this repeated pattern which control properties like strength, ductility, density, conductivity (property of conducting or transmitting heat, electricity, etc.), and shape. There are 14 general types of such patterns known as Bravais lattices.
See also: Crystal Structure of Materials
Thermal Properties of Calcium
Calcium – Melting Point and Boiling Point
Melting point of Calcium is 842°C.
Boiling point of Calcium is 1484°C.
Note that, these points are associated with the standard atmospheric pressure.
Calcium – Thermal Conductivity
Thermal conductivity of Calcium is 200 W/(m·K).
The heat transfer characteristics of a solid material are measured by a property called the thermal conductivity, k (or λ), measured in W/m.K. It is a measure of a substance’s ability to transfer heat through a material by conduction. Note that Fourier’s law applies for all matter, regardless of its state (solid, liquid, or gas), therefore, it is also defined for liquids and gases.
Coefficient of Thermal Expansion of Calcium
Linear thermal expansion coefficient of Calcium is 22.3 µm/(m·K)
Thermal expansion is generally the tendency of matter to change its dimensions in response to a change in temperature. It is usually expressed as a fractional change in length or volume per unit temperature change.
Calcium – Specific Heat, Latent Heat of Fusion, Latent Heat of Vaporization
Specific heat of Calcium is 0.63 J/g K.
Heat capacity is an extensive property of matter, meaning it is proportional to the size of the system. Heat capacity C has the unit of energy per degree or energy per kelvin. When expressing the same phenomenon as an intensive property, the heat capacity is divided by the amount of substance, mass, or volume, thus the quantity is independent of the size or extent of the sample.
Latent Heat of Fusion of Calcium is 8.54 kJ/mol.
Latent Heat of Vaporization of Calcium is 153.3 kJ/mol.
Latent heat is the amount of heat added to or removed from a substance to produce a change in phase. This energy breaks down the intermolecular attractive forces, and also must provide the energy necessary to expand the gas (the pΔV work). When latent heat is added, no temperature change occurs. The enthalpy of vaporization is a function of the pressure at which that transformation takes place.
Calcium – Electrical Resistivity – Magnetic Susceptibility
Electrical property refers to the response of a material to an applied electric field. One of the principal characteristics of materials is their ability (or lack of ability) to conduct electrical current. Indeed, materials are classified by this property, that is, they are divided into conductors, semiconductors, and nonconductors.
See also: Electrical Properties
Magnetic property refers to the response of a material to an applied magnetic field. The macroscopic magnetic properties of a material are a consequence of interactions between an external magnetic field and the magnetic dipole moments of the constituent atoms. Different materials react to the application of magnetic field differently.
See also: Magnetic Properties
Electrical Resistivity of Calcium
Electrical resistivity of Calcium is 33.6 nΩ⋅m.
Electrical conductivity and its converse, electrical resistivity, is a fundamental property of a material that quantifies how Calcium conducts the flow of electric current. Electrical conductivity or specific conductance is the reciprocal of electrical resistivity.
Magnetic Susceptibility of Calcium
Magnetic susceptibility of Calcium is +40e-6 cm^3/mol.
In electromagnetism, magnetic susceptibility is the measure of the magnetization of a substance. Magnetic susceptibility is a dimensionless proportionality factor that indicates the degree of magnetization of Calcium in response to an applied magnetic field.
Application and prices of other elements