Dear Md. Abu Sayeed thanks for posting this interesting technical question on RG. In this context, please have a look at the following relevant article which might help you in your analysis:
Structural and electrical characterisation of lanthanum nickelate reactively sputter-deposited thin films
Article Structural and electrical characterisation of lanthanum nick...
The paper is unfortunately not accessible as public full text on RG, but two of the authors have RG profiles. Thus it should be easily possible to request the full text of the article directly from one of them via RG.
There are various commercial sources of LNO sputtering targets, e.g. https://www.sputtertargets.net/oxide-ceramic/lanthanum-nickel-oxide-sputter-target.html