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DOE OSTI2020

Materials Data on KClO4 by Materials Project

KClO4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K is bonded in a 10-coordinate geometry to ten O atoms. There are a spread of K–O bond distances ranging from 2.92–3.21 Å. There are three inequivalent O sites. In the first O site, O is bonded in a distorted single-bond geometry to one K and one Cl atom. The O–Cl bond length is 1.45 Å. In the second O site, O is bonded to three equivalent K and one Cl atom to form a mixture of distorted edge and corner-sharing OK3Cl tetrahedra. The O–Cl bond length is 1.47 Å. In the third O site, O is bonded in a distorted single-bond geometry to three equivalent K and one Cl atom. The O–Cl bond length is 1.46 Å. Cl is bonded in a tetrahedral geometry to four O atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on KClO4 by Materials Project

KClO4 crystallizes in the cubic F-43m space group. The structure is three-dimensional. K is bonded in a 12-coordinate geometry to twelve equivalent O atoms. All K–O bond lengths are 3.20 Å. O is bonded in a single-bond geometry to three equivalent K and one Cl atom. The O–Cl bond length is 1.47 Å. Cl is bonded in a tetrahedral geometry to four equivalent O atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1974

A study of the effects of solid phase reactions on the thermal degradation and ballistic properties of solid propellants

The thermal stability of perchlorate composite propellants was studied at 135 and 170 C. The experimental efforts were concentrated on determining the importance of heterogeneous oxidizer-fuel reactions in the thermal degradation process. The experimental approach used to elucidate the mechanisms by which the oxidizer fuel composites thermally degrade was divided into two parts: (1) keeping the fuel constant and varying the nature of the oxidizers, and (2) holding the oxidizer constant and varying the fuel components. The fuel component primarily utilized in the first phase was polyethylene. Oxidizers included KClO4, KClO3, NH4ClO4 and NH4ClO4 doped with materials such as chlorate, phosphate and arsenate. In the second phase the oxidizer used was primarily NH4ClO4 while the fuels included saturated and unsaturated polybutadiene prepolymers and a series of bonding agents. Techniques employed in the current study include thermogravimetric measurements, differential thermal analysis, infrared, mass spectrometry, electron microscopy, and appropriate wet chemical analysis.

Schmidt, W. G.↗