Ammonium perchlorate is commonly used as an oxidizer in solid rocket propellant. Having a knowledge of its thermal expansion properties is essential for its application in different environments. Knowledge of thermal expansion properties is also useful for the prediction of propellant mechanical properties and response of propellant slow cook off applications. X‐ray diffraction analysis was performed on ammonium perchlorate at temperatures ranging from 260 K to 500 K. From there, Bragg peaks were indexed by fitting theoretical values of 2θ to the 2θ values of peaks obtained from the experiment. The Miller indices along with the 2θ values were then used to solve for the lattice parameters at each temperature. The lattice parameters, in nanometers, range from 0.9201 to 0.9373, 0.5805 to 0.5865, and 0.7439 to 0.7535 for a, b, and c, respectively. The measurement of the lattice parameter expansion leads to the determination of the temperature dependent thermal expansion coefficients within the temperature range. The lattice parameter values also lead to the determination of strain and stress on the ammonium perchlorate crystal. Direct measurement of the strain within the crystal lattice provides a more accurate measurement method over traditional optical‐based techniques.

中文翻译：

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基于同步加速器的高氯酸铵温度相关热膨胀系数测量

高氯酸铵通常在固体火箭推进剂中用作氧化剂。了解其热膨胀特性对于其在不同环境中的应用至关重要。热膨胀特性的知识也可用于预测推进剂的机械性能和推进剂慢煮应用的响应。对高氯酸铵在260 K至500 K的温度范围内进行X射线衍射分析。从那里开始，通过将2θ的理论值与实验所得峰的2θ值进行拟合来索引布拉格峰。米勒指数和2θ然后将这些值用于求解每个温度下的晶格参数。对于a，b和c，以纳米为单位的晶格参数分别为0.9201至0.9373、0.5805至0.5865和0.7439至0.7535 。晶格参数膨胀的测量导致确定温度范围内与温度相关的热膨胀系数。晶格参数值还导致确定高氯酸铵晶体上的应变和应力。与传统的基于光学的技术相比，直接测量晶格内的应变提供了一种更准确的测量方法。